Structural Members Research Articles

Fibre orientation in SFRC slabs and consequences for punching shear and flexural resistance

The use of steel fibre reinforced concrete (SFRC) is a well-known method for enhancing the punching and flexural resistances of flat slabs. The structural performance of SFRC elements depends significantly on the fibre distribution and orientation, which are typically unknown. One of the largest uncertainties regarding the performance and reliability of SFRC concerns the determination of its post-cracking mechanical properties in the real structural element, normally performed via standardised tests. However, due to differences in element sizes and casting procedures, and to the presence of rebars, the fibre spatial distribution and orientation in the standard specimens differ in general from those of the structural member. Several researchers have studied the correlation between the orientation of fibres and the mechanical performance of SFRC, yet tests were rarely carried out under representative conditions of the actual behaviour of the target structural member. The present paper analyses the spatial distribution and orientation of steel fibres in six SFRC flat slabs that were previously tested in concentric punching at the University of Brescia. The aim of this work is to analyse the fibre orientation and spatial distribution in structural elements. Cores were extracted from the specimens after the punching tests and scanned using micro-computed tomography (μ-CT) to reconstruct the fibre skeleton. The fibre arrangement was analysed focusing on the variation of the fibre spatial distribution and orientation through the slab thickness. A formulation to express the actual fibre dispersion in concrete is proposed, and effectiveness factors are defined to reflect the efficacy of fibres in punching shear and flexure, based on their location in the slab thickness. Pseudo-horizontal fibre orientations are found to be governing, with closer distributions to a 2D scenario for thicker slabs and higher fibre contents. Furthermore, the influence of flexural reinforcement on the fibre orientation has been observed to be significant. The observed fibre orientations are detrimental for the direct transfer of shear forces across cracks, but are favourable for enhancing the flexural capacity of the slab.

Mechanical properties of aged glue laminated bamboo for structural members

This research experimentally investigates the mechanical properties of aged unidirectional engineered bamboo (EB) laminate, pivotal in constructing glued laminated bamboo (glubam) structures. Investigations encompassed both outdoor exposure and artificial accelerated aging tests. In particular, outdoor exposure spanning three six-month intervals from July 2019 to December 2020. Complementarily, the Boil-Test (BT) method, as per the BS EN1087–1 standard, was employed for accelerated aging. The research examined tension, compression, bending, and shear mechanical characteristics of the aged bamboo samples. Notably, failure modes were predominantly influenced by fiber, matrix, and interfacial lamination layers. Findings revealed the superior anti-aging capacity of bamboo fibers compared with than that of bamboo matrix and lamination layer. Bamboo fibers maintaining over 75% of their original tensile strength. The BT accelerated aging method gave conservative estimations compared to outdoor exposure tests. Conclusively, the research yielded a novel tri-linear stress-strain model for analyzing the bending performance of glubam structures under varying aging conditions. This model incorporated strength reduction factors derived from the experimental data obtained from the corresponding compression and tension tests.

The Impact of Various Heating Rates on Real-Time Degree of Hybrid Fire Simulation

Global fire performance of structures in fire is proven to be more advantageous in many cases of engineering practice than the prescriptive fire resistance based on isolated structural member testing. Hybrid fire simulation (HFS) is a novel well-suited method trending in recent years for analysis of global performance of structures in fire. In the principles of this method, the part of a structure which has unknown behavior or is uncertain to be numerically modeled (subjected to fire) would be physically tested, while the rest of the structure is numerically simulated. HFS method enables capturing the beneficial interaction mechanisms evolving between fire-exposed structural members and the adjacent cooler substructure. Due to the continuous temperature increase in a fire test and the existing thermal inertia as well as the rate- and temperature-dependent material behavior of structures exposed to fire, a real-time performance in hybrid fire simulation counts as a necessity. This challenge is more critical for hybrid fire simulations with higher applied heating rates relevant to structural fire engineering. Within scope of this paper, (a) a robust and rigorous approach for real-time HFS is presented; (b) a series of proof-of-concept studies of different hybrid fire simulations with various applied heating rates are carried out for a thermomechanical benchmark problem; (c) the important results of four representative hybrid fire simulations with relevant heating rates to structural fire engineering are discussed; (d) the importance of an appropriate calculation method for stiffness update of the fire-exposed structural member over HFS procedure is highlighted, and e) the precision and accuracy of the applied HFS approach with respect to interface error and real-time degree are evidenced.

Automated planar truss design with reclaimed partially disassembled steel truss components

A promising solution to decarbonize steel construction is reusing steel structural components from existing disassembled structures as it avoids sourcing raw material and the heating associated with recycling, as well as reducing the amount of waste from construction and demolition. However, barriers associated with increasing the use of reused steel components in modern construction include concerns about an increased length of the demolition process and the dramatic changes it requires in the structural design task. To simultaneously alleviate these concerns, this work presents a new stock-constrained design and optimization framework for designing planar truss structures from a stock library of partially disassembled trusses. In contrast to existing design methods that rely on reuse at the element level, this work mitigates the demolition process requirements by avoiding the complete disassembly of all structural members. The new automated design framework eases the design process and aggregates partially disassembled triangular components while introducing new material members where necessary to ensure that the new design matches the exterior geometric requirements. The proposed approach is fast (on the order of 0.1 s to generate a trial truss), and a GA optimization module is added to select among generated trial designs. Three case studies with realistic stock libraries demonstrate the potential of partially disassembling and reusing truss components and illustrate how the user-defined design shape and the stock variability influence the resulting design.

Comparative Assessment of FRP Composite Materials in Structural Applications under Low-Velocity Impact Loads: A Review

Fiber-reinforced polymer materials (FRPs) have been investigated as enhancing materials for various structural members against impact loading. This study reviews and highlights the impact resistance properties of structural members strengthened with different composite strengthening materials, explicitly focusing on vehicle collisions with bridge elements. While most existing research concentrates on the effectiveness of carbon fiber-reinforced polymer (CFRP) against impact loads, this study explores the performance of alternative materials. Comparative studies, including assessing aramid fiber-reinforced polymer (AFRP) versus CFRP, suggest that AFRP exhibits superior anti-impact mechanical properties, including enhanced energy-absorbing capacity. However, contradictory findings necessitate further investigation. Moreover, Dyneema® fiber-reinforced polymer (DFRP) emerges as a promising alternative with superior anti-impact mechanical properties compared to CFRP. Despite this potential, DFRP has not yet found widespread application in structural contexts. This research aims to bridge existing gaps in understanding practical applications for strengthening materials against impact loading. The presentation will include quantitative insights into the comparative performance of different materials and discuss the findings’ potential implications for future structural engineering applications.

Analytical Assessment of Composite L Angle Strength Under Internal Fuel Pressure in Composite Wing

The Interspar (IS) box stores the turbine fuel in the composite wing of an Aircraft. The filled fuel is under pressure that induces out-of-plane stresses on all the wing’s structural members around the fuel tank’s boundary. The wing is designed using carbon fiber reinforced plastic (CFRP) with the co-curing of the bottom skin and its stringers along with front and rear spars. A suitable number of cut-outs are made on the top and bottom sides of the IS ribs for the stringer to pass through them. The global finite element analysis showed that the stringer cut-out regions in the IS ribs are highly stressed, as they are subjected to out-of-plane load due to internal fuel pressure, which induces transverse tensile stress in the cut-out region. Resin is the weakest material in the composite laminate, but it has to resist the high-stress component due to out-of-plane loads. The top and bottom flanges of the ‘C’ section IS ribs geometrically form an L angle section with a stringer cut-out made in it. At the L angle location, the IS ribs are critical from both the strength and stiffness point of view. Strength and stiffness at the interface of the fastener joint are essential factors in maintaining the composite wing’s overall structural integrity under internal fuel pressure. The authors adopted the same standalone finite element (FE) modelling approach developed for the Bond Energy Method and carried out appropriate analytical studies to ascertain the safety and structural integrity of the composite wing under internal fuel pressure. This article presents the analytical study carried out on the standalone FE model of an L angle with the stringer cut-out introduced at its appropriate position. The static stress analysis is carried out by enforcing the global displacement on this standalone FE model and extracting three force components in CBAR beam elements representing the resin property in the transverse direction of the composite laminate. The stresses are calculated outside the analysis deck using Excel® spreadsheets. The maximum Normal Stress (σn) in the L angle flange is found to be 13.25 MPa, which is well within the resin or transverse tensile strength of the composite laminate 53 MPa, and the shear stress is found to be 11.10 MPa, which is less than the resin shear strength property of 23 MPa. Hence the study showed that the L angle is safe for carrying internal fuel pressure of 12.5 PSI. The study also showed that the strain and displacement values distribution in the standalone FE model are comparable with that of the global wing box model within the range of (8-10) % and (4-5) % difference, respectively.

Behaviour of Full-scale Shear Critical RC Beams Strengthened with Textile Reinforced Mortar

Textile reinforced mortars (TRM) have recently been used for strengthening of Reinforced Concrete (RC) structural members by researchers. Carbon, glass, aramid and Polyphenylene Benzobisoxazole (PBO) fibres have extensively caught the eyes of the scientists and research enthusiasts, basalt fibre has been mostly explored for strengthening of masonry. For beams, a narrow band of data is available TRM using basalt fibres as strengthening material, most of which comprises of small-scale tests. An experimental investigation of full-scale shear critical RC beams with varying shear span-to-depth (a/d) ratios between 1 to 2.5 is presented in this paper. Six beams were tested in which three beams served as control beams for respective a/d ratios, while the remaining three beams were strengthened with basalt fibres based TRM. TRM was provided at the bottom of the RC beams in the shape of U-shaped wraps for corresponding a/d ratios. The basalt fibres based TRM was found to be effective in improving the performance of RC beams in terms of serviceability. Both cracking and deflections were controlled. The use of TRM also improved load carrying capacities of TRM strengthened beams in flexure. Appearance of first cracks was delayed, post cracking stiffness of the flexural members was enhanced and showed better performance in terms of ductility.

A state of art of review on strengthening of concrete structures using fabric reinforced cementitious matrix

Renovation, refurbishment, restoration, and retrofitting of existing structures have grown more challenging issues for the construction profession. Construction buildings are susceptible to damage at the time of the earthquake and need strengthening to enhance their strength, stiffness, and ductility. Fabric-reinforced cementitious matrix (FRCM) techniques have been recently introduced to the construction sector as a feasible solution for fiber-reinforced polymers (FRP) in strengthening application. FRCM composed of high strength fabric grids with cement-based material serve as a binder for FRCM matrices. The binder employed for FRCM composed of cement-based mortar along with polymers are added to improve the bond strength properties. The cementitious matrix utilized in FRCM has superior thermal resistance and better compatibility with the concrete surface. The utilization of FRCM matrix for upgrading and restoring the concrete members is gaining more prominence as a replacement to FRP. This work conducts a thorough analysis of the application of FRCM techniques to concrete structural members like beams, columns, slabs, and beam-column joints. This paper primarily aims to present the FRCM process on structural members and to discuss the flexural, shear, and load carrying FRCM materials that are used in the field.

Analysis of a Nailed Soil Slope Using Limit Equilibrium and Finite Element Methods – A Review

Reviewing the two most used techniques for slope stability analysis is the goal of this research. The analysis derived from PLAXIS 2D (finite element based) and SLOPE/W (limit equilibrium based). Two 45degree and 60-degree slope angles that are strengthened with nails at three different inclinations—0, 15, and 30—are used for the analysis. All nail inclinations and slope angles are measured from the horizontal. A comparative analysis of stability metrics, including critical slip surfaces, nail forces, and factor of safety, has been conducted. It is discovered that the limit equilibrium approach produces greater values of the factor of safety when compared to the finite element method. There are notable differences between the failure surfaces obtained from the two methods.Large nail forces are seen using the LEM approach for 45 slopes with all nail inclinations, however the FEM method indicates an increase in the nail forces for 60 slope angles. In conclusions, both FEM and LEM methods have advantages and disadvantages. These two methods give the precise results if both methods are combined. The analysis using the LEM to compute the factor of safety are further enhanced with the Finite Element using PLAXIS 3D to compute the stress strain displacement of the soil with added soil nailing or structure member such as retaining wall.

Uma abordagem direta pelo MEF para modelar concreto em mesoescala e conectar malhas não conformes em análises multiescala

Abstract The mechanical degradation of concrete structures is a phenomenon dependent on the material heterogeneity observed at mesoscale. As the mechanical degradation is a localized phenomenon, structural members and structures may be simulated using the concurrent multiscale analysis technique. Thus, only the most critical regions are modeled in mesoscale, reducing the computational cost compared to the simulation of the entire structure at this scale. This work presents two contributions in concurrent multiscale analysis. The first contribution introduces an alternative representation of the mesoscale interfacial transition zone (ITZ) of the concrete together with a strategy that allows modeling particles (coarse aggregates) without degrees of freedom. The resulting ITZ representation allows the simulation of more realistic discrete cracks in concrete modeling. The second contribution uses particle-like elements without degrees of freedom as coupling elements to model non-matching meshes between different media. The proposed coupling technique does not add degrees of freedom and does not use penalty or Lagrange Multipliers methods. Experimental and numerical results are used in order to validate the proposed multiscale formulation regarding concrete specimen simulations.

Optimum and efficient design of steel foot over bridges

This work used the Finite Element Method (FEM) to estimate the shear force for a blind shear ram type blowout preventer. In recent years, significant advancements have been made in the design of Foot Over Bridges (FOBs) through the utilization of advanced analytical methods, innovative materials, and novel bridge concepts. FOBs have gained popularity in urban India due to their ability to facilitate safe pedestrian crossings without disrupting vehicular traffic flow, thereby enhancing pedestrian safety in areas with heavy traffic. This research focuses on the development of an economically optimized steel FOB design specifically tailored for the Mumbai region. The primary objectives are to ensure durability, stability, safety, and cost-effectiveness in the design. The study involves modelling the typical span of a skywalk structure using STAAD Pro, followed by comprehensive analysis and design iterations for various configurations based on real-world spans of existing pedestrian bridges. Static loading conditions are applied to the FOB models, allowing important characteristics like weight, number of joints, number of members, weld lengths, painting surface area, and natural frequency of pedestrian bridges to be evaluated. These factors are carefully contrasted to determine the bridge design that is the most economical. Additionally, vibration tests are conducted on two selected skywalks to assess their compliance with serviceability criteria. The research scrutinizes the utilization ratio of members in the bridge structures and explores variations in section sizes within the design to achieve the optimal configuration. The findings are presented in detail, offering valuable insights into the process of identifying the most economical FOB design from the skywalks in the Mumbai suburban region. This study contributes to the enhancement of pedestrian infrastructure in urban India by delivering a robust and cost-efficient FOB design approach.

The damping problem in non-linear viscoelastic frames under varying temperature

A theoretical consideration of the damping problem in frame engineering structures made of functionally graded materials with non-linear viscoelastic behaviour is carried-out. The frames studied are under external mechanical load and varying temperature. In particular, damping in a two-legged frame with supports on different levels is analyzed. The frame is subjected to a cyclic side load with simultaneous variation of the temperature. The material of the frame is functionally graded in the thickness direction. Thus, the material properties change smoothly along the thickness. Equilibrium equations are used for determining the curvature and the neutral axis coordinates in the members of the frame structure. The damping energy density is integrated in the volume of the frame members in order to find-out the damping energy in the whole frame structure. A parametric investigation is performed by using the solution of the damping energy in order to clarify the influence of various factors (the frame geometry, loading, etc.) on the damping phenomenon at different temperatures.

Identification of pre-tensioning of rebars based on the acoustoelastic effect

Rebar as the core vertical prestressing stressing member of the bridge structure. The stress loss can not be effectively controlled during the whole process of anchorage, coupled with the influence of environmental corrosion. The result is that the vertical prestressing force cannot meet the design requirements, seriously threatening the durability and safety of the structure. This paper combines ultrasonic guided wave technology with acoustic elasticity theory to detect the effective prestressing of rebar. Guided wave propagation characteristics and acoustic elasticity effect under different tensile forces after bare rebar and outsourcing mortar are investigated. Tension tests and guided wave propagation tests were carried out on the specimens to analyze the variation rule between the first wave speed of guided waves and the tension force. The results show that the first wave speed of the guided wave decreases with the increase of the excitation frequency, which is consistent with the theoretical frequency dispersion curve. With the gradual increase of the excitation power, the amplitude of the guided waveform received by the rebar increases gradually only in the time and frequency domains. The law between first wave speed and tension after the outsourcing mortar is consistent with that of bare rebar. It is feasible to establish an identification method of prestressing rebar based on acoustoelastic effect.

Retrofitting of Thermally Affected Structural Compression Member Using Basalt FRP Laminates

Concrete structures exposed to high temperatures often experience thermal damage, which can significantly reduce their structural integrity. Fiber-Reinforced Polymer (FRP) wrapping is a common retrofitting technique used to restore the strength and durability of thermally affected concrete. This study investigates the effectiveness of Basalt Fiber-reinforced Polymer wrapping on different concrete specimens with varying orientations of wrapping. This study mainly focuses on various parameters as fiber orientation and wrapping methodology. A series of 15 columns of dimension 150mm x 150mm with a length of 700mm are cast and subjected to axial compression loading in a pre-heated condition until the initial cracking occurs. These cracked columns are made to strengthen using Basalt Fiber with different patterns of orientation of laminates. The retrofitted columns are subjected to axial compression loading to determine their maximum load-bearing capacities. The test results of this experiment is assessed and compared with conventional RC columns of same grade. The strength of retrofitted columns versus conventional ones are compared and analyzed. The maximum load bearing capacity for a particular pattern of wrapping is determined.

Alvenarias de concreto não-armadas sob compressão: estatísticas brasileiras, análises de confiabilidade e calibração de norma

Abstract Although the new Brazilian code is considered an advancement, it still lacks a reliability-based calibration of partial safety factors. Therefore, this paper presents a comprehensive set of reliability analyses oriented to structural masonry members under compression in Brazil. This study was based on structural reliability theory, which allowed a safety assessment through the reliability index (β). Walls with hollow concrete blocks of three classes (A, B and C) and two modular sizes (M-15 and M-20), two ratios between the prism strength and the block compressive strength ( η = 0.5 and 0.6), and three ratios between effective height and effective width (λ = 14, 19 and 24) were evaluated. Considering that each one of the 36 elements is described by five ratios between live and dead loads and the five ratios between wind and dead loads, 900 configurations were analyzed. Reliability procedures, the structural configurations and the calibration methodology were implemented and solved in the StRAnD – Structural Reliability Analysis and Design software. Results showed that the reliability indexes are greater for unreinforced masonry walls under compression with modular size M-20 than modular size M-15. It can be noted that the block compressive strength not only represents the greatest impact on the masonry’s safety level, but is also the most relevant random variable. Based on the reliability-based calibration of the Brazilian code, it is recommended that unreinforced masonry presents different partial safety factors ( ɣ m) than reinforced masonry. This work represents a stepping stone in evaluating the safety of Brazilian masonry structures, indicating a possible path in terms of achieving a more uniform reliability in masonry design.

Multiphysics-Lattice Discrete Particle Model: possible strategies for upscaling

The optimization of civil infrastructure maintenance and management is a challenging task, littered of open issues requiring the synergic development of effective structural health monitoring systems and reliable models to be addressed. Relevant to concrete structures, models cannot disregard the multi-physics nature of the problem: moisture and heat transport phenomena in uncracked and cracked conditions, the ingress of aggressive agents, and the ensuing chemical reactions - that the latter may trigger - heavily affect the mechanical performance. Most of the mentioned processes happen at a scale typically smaller than the structural one. Then, it is also necessary to perform multiscale analysis, capable of adapting structural models to the insights resulting from lower scale analyses. In the last decade, Multiphysics-Lattice Discrete Particle Model (M-LDPM) has been successfully adopted to model a wide range of phenomena in civil engineering involving concrete structural members: ageing, environment-induced degradation, shrinkage, creep, and usage of advanced construction materials. Furthermore, the discrete nature of the model has shown the capability of predicting the cracking patterns accurately. However, such a comprehensive and accurate model simulates the material at the mesoscale, and the path towards the exploitation of the insights resulting from lower-scale modelling at the structural level is paved of computational and theoretical burdens. In this work, a review of the state-of-the-art concepts that allow upscaling M-LDPM is presented. The aim is to explore alternatives for the formulation of computationally efficient macroscale models that leverage on both the predictive quality of M-LDPM in capturing and predicting the material constitutive behaviour, and the computational affordability that features the classical Finite Element Method for the structural analysis of complex systems.

Numerical study on inelastic cyclic behavior of CFRP wrapped substandard RC columns

Few numerical investigations have been carried out on fiber-reinforced polymer (FRP)-jacketed substandard RC columns with characteristics not normally met in properly designed structural members. Three columns were modeled through finite element method (FEM) by means of ATENA and OpenSees considering their cyclic lateral-load displacement hysteretic responses, where i) the first column (S) represents the typical characteristics of substandard columns violating rules of their construction time (i.e. 1975 Turkish Seismic Design Code) in terms of compressive strength of concrete (fc ≈ 10 MPa) and transverse reinforcement detailing (s=250 mm, where s is stirrups spacing), ii) the second column (C) represents the columns of buildings thoroughly complying with the requirements of their construction time (i.e. 1975 Turkish Seismic Design Code) (fc ≈ 20 MPa and s=80 mm), and iii) the third column (RS) is identical to a substandard column (S), but retrofitted with a CFRP jacket of 1 ply thickness. High axial load-to-axial capacity ratio (0.75 fcbh) together with high shear demand were among main features of the substandard column (S). Also, the Ve/bhfct value for S, C, and RS were 0.87, 1.43, and 1.64, respectively. Note that b, h, Ve, and fct are column width, column height, shear force corresponding to bending moment, and direct tensile strength of concrete, respectively. In OpenSees model distributed plasticity, slip (due to strain penetration into the foundation of longitudinal bars at the column-foundation interface), cyclic stiffness, strength degradations and buckling of rebars in compression are considered. In ATENA, the columns were modeled as a single macro element and discretized by fine meshes capturing both flexure and shear deformations. The results obtained through the numerical modeling both in ATENA and OpenSees are in good agreement with the experimental ones. As per the nonlinear analyses, member damage levels are assessed by means of the strain-wise performance limits given in Turkey Building Earthquake Code (2018). The pros and cons of the modeling approaches and their accuracy are discussed as well.

Shear stress transfer at the SRG-concrete interface: influence of the number of layers

Externally bonded SRG (steel reinforced grout) is a promising technique for strengthening existing RC (reinforced concrete) and masonry structures. SRG is a composite material made of high-strength steel fibers embedded in a geo-polymeric (inorganic) matrix. The failure of structural members strengthened with SRG composites typically occurs due to debonding when an interfacial crack develops at the fiber-matrix interface. This paper presents the results of single-lap shear tests performed in order to study the debonding phenomenon of SRG composites bonded to a concrete substrate. Specimens with one and two textile layers were tested to assess the dependency of the debonding mechanism and bond capacity on the number of layers. The results of the single-lap-shear tests were then used to derive a local CML (cohesive material law), which describes the interaction between the concrete substrate and the SRG strips.

UPGRADING OF CORROSION DAMAGED RC BEAMS USING MECHANICALLY FASTENED CFRP COMPOSITES

Reinforced Concrete structures are suffering from various deteriorations like corrosion, cracks, spalling and large deflection. These deteriorations are caused by various factors such as aging, corrosion of steel reinforcement, environmental effects and accidental impacts on the structure. There are several options available for retrofitting the structural members of the existing reinforced concrete structures. Bonding of thin steel plates is the common method of retrofitting. Nowadays, bonding using fiber reinforced polymer sheets on to the damaged members helps to increase load carrying capacity, ductility and stiffness of the damaged structure. Such technique is an effective way to improve the flexural and shear performance of the reinforced concrete damaged structure. This project mainly focused on retrofitting the corrosion damaged reinforced concrete beams using mechanically fastened carbon fiber reinforced laminates. This type of retrofitting increases the load carrying capacity of the corrosion damaged reinforced concrete beams. It also increases the flexural and fatigue strength of the damaged reinforced concrete beam. Here, the general review of literature on the reinforced concrete structures, in which FRP used for strengthening purpose, is briefly presented and they were listed in the references at the end of the report.

Seismic Performance of Damaged Code-Conforming RC Columns Repaired with Sustainable Structural Mortar

Examining the seismic performance of damaged reinforced concrete (RC) structures after repair applications is vital for an effective post-earthquake disaster management policy. However, the number of experimental studies investigating the seismic behavior of repaired RC members is insufficient, especially for structural members that have endured slight or moderate level damages. In this study, four identical large-scale code-conforming RC columns were tested under combined effects of axial load and reversed cyclic lateral displacements. The reference column was tested until failure, while the remaining three columns were first imposed to lateral displacements until the formation of damages at different levels, then repaired with structural repair mortar that contains recycled raw materials without removing axial load and tested again until failure. The primary objectives of the experimental program are to enhance the knowledge on the post-earthquake performance of damaged RC columns and to investigate the effects of repair applications after slight and moderate damage levels. This paper provides details on the effectiveness of the aforementioned repair technique on the seismic performance of code-complying RC columns damaged at different damage levels.