Fiber Bridging Effect Research Articles

The residual stress characteristics and mechanical behavior of shot peened fiber metal laminates based on the aluminium-lithium alloy

The effect of shot peen forming on the mechanical behavior of fiber metal laminates (FMLs) based on aluminium-lithium alloy was investigated to reveal the strengthening mechanism and to dispel the suspicion that shot peen forming may result in the performance deterioration of FMLs. The interlaminar, static strength and fatigue properties of shot peened FMLs were investigated. The residual stress characteristics of the shot peened FMLs was also involved with finite element analysis to help understanding the unique mechanical behavior. The results indicated that shot peening caused non-negligible work hardening in external metal layers, which increased the tensile strength of the laminates. But the work hardening did not deteriorate the elongations of FMLs since the failure still dominated by the limitation of fiber failure strain. Moreover, two yield stages were observed in the tensile tests of shot peened FMLs owing to the great difference in stress states between external and internal metal layers. The compressive stress introduced by shot peening effectively improved the FCG properties of FMLs. All metal layers possessed similar crack propagation rates despite that the stress difference was up to 300 MPa, which indicated that the fiber bridging effect still dominated the FCG of FMLs.

Behaviour of recycled tyre polymer fibre reinforced concrete under dynamic splitting tension

Recycled tyre polymer (RTP) fibre has recently been gaining ever-increasing attention from the scientific community as a promising substitute to synthetic fibres for cementitious composites to improve sustainability. This paper, for the first time, investigates the behaviour of RTP fibre reinforced concrete (FRC) under dynamic splitting tension, focusing on the effects of fibre content (0.1, 0.2, 0.4 and 0.8 vol%) and strain rate (0.88–3.54 s−1) and the feasibility of replacing polypropylene (PP) fibre with RTP fibre for FRC. Results indicate that the inclusion of RTP fibres is favourable in enhancing the splitting tensile properties of concrete under various strain rates (10−1 to 101 s−1), where the dynamic splitting tensile strength and dissipated energy of concrete mixture containing 0.2 vol% RTP fibre are improved by 5.5%–14.2% and 24.9%–36.7% respectively compared to the plain mixture as a result of fibre bridging effect. Fibre pull-out process considerably contributes to the enhancement of energy dissipation capacity. The splitting tensile properties of all mixtures are sensitive to strain rate, where the developed empirical equations well describing the relationship between dynamic increase factor (DIF) and strain rate provide insight into this rate sensitivity. A comparison between RTP-FRC and PP-FRC confirms that RTP fibre can be used as a sustainable and cost-effective alternative to PP fibre for cementitious materials considering engineering properties and potential economic benefit of the composites.

3D Printing of Well Dispersed Electrospun PLGA Fiber Toughened Calcium Phosphate Scaffolds for Osteoanagenesis

Although the toughening of Calcium phosphate (CaP) scaffold by the addition of fiber has been well recognized, integrated mechanical, structural and functional considerations have been neglected in the design and fabrication of CaP scaffold implant. The emerging 3D printing provides a promising technique to construct CaP scaffold with precise size and elaborate microstructure. However, the most challenge is to extrude smoothly the CaP paste containing fibers for frequently-used extrusion-based 3D printing. In this study, frozen section and chemical dispersant (Pluronic F127, F127) were employed jointly to prepare non-aggregated polylactic-co-glycolic acid (PLGA) fibers. The injectability of CaP pastes with well dispersed PLGA fibers was more than 90% when the content of PLGA fibers was no more than 3 wt%. Meanwhile rheological property of CaP pastes with well dispersed fibers showed shear thinning, which were both beneficial to extrude CaP paste with well dispersed fibers for 3D printing. Moreover, these CaP scaffolds showed ductile fracture behavior due to the pullout and bridging effect of PLGA fibers. The cell proliferation and alkaline phosphatase (ALP) activity indicated that 3D printed CaP scaffold containing PLGA fibers possesses excellent biocompatibility and facilitate osteogenic differentiation ability. Thus, it was feasible to print CaP pastes with well dispersed PLGA fibers to construct toughening CaP scaffolds with the higher shape fidelity and complex structures, which had significant clinical potentials in osteoanagenesis due to their higher toughness and excellent biocompatibility.

A strategy for in situ determination of self-healing state for strain hardening cementitious composites

In strain-hardening cementitious composites, the bridging effect of fibers can control crack openings to very small values so the cracks can be self-healed in the presence of water. To rely on autogeneous self-healing to enhance the durability of structures, a method to assess the state of self-healing is required. A new strategy is presented in this paper for in-situ measurement of the healing effect without pre-knowledge of the environmental condition (such as moisture). Exploiting the fact that the electrical conductivity in the crack is lower than that of the undamaged section, the effective macroscopic cracking effect is first distinguished by frequency dependent impedance measurements both along (parallel to) and across the cracks. Dielectric spectroscopy along the cracks is found to correlate well with gravimetric measurements and can therefore, be used for inverse approximation of moisture content. The effect of moisture change on the equivalent resistance in the direction across the cracks can then be derived approximately from measurements under various moisture contents. The approximated resistance vs moisture curve is found to reflect the evolution of autogenous self-healing, and a curve indicating almost complete healing agrees well with the recovery in member stiffness measured from loading test.

Smart Expandable Fiber Additive To Prevent Formation of Microannuli

Summary One of the critical issues that occur in many oil and gas wells is the failure of the cement sheath because of debonding from the casing string or from the formation. This results in the formation of microannuli, which can become pathways for fluid migration. Cement shrinkage during setting is regarded as one of the main causes of the formation of microannuli. In this paper, a new class of polymer-based expandable additives in the form of fibers is incorporated into the cement to compensate for shrinkage and thereby help prevent the formation of microannuli in oil and gas wells. The proposed fiber additives are made from shape-memory polymers (SMPs) and expand when exposed to temperatures above a specific value that is, by design, below the downhole temperature of the cemented zone. Fiber expansion occurs after the placement of the cement slurry but before its setting to avoid the inducement of any microfractures. As a result of the expansion of the cement paste, flow channels and fluid migration may significantly decrease while preserving the mechanical properties required for the mechanical integrity of the cement sheath. The bridging effect of fibers across individual microcracks helps control the propagation and coalescence of small fractures. Considering the inert property of the proposed additive, the water-cement ratio and its chemical properties do not need to be revisited. The measured increase in cement ductility makes the cement system more resistant to cracking. The cement expansion, fluid loss, gel strength, compressive strength, ductility, and tensile strength of the samples containing these fibers are examined using destructive and nondestructive methods, as reported here. The proposed class of expandable additives can help operators reach sustainable well integrity by increasing the contact stress at the cement–casing and the cement–formation interfaces to prevent fluid migration and the propagation of cracks.

An enhanced beam theory based semi-analytical method to determine the DCB mode I bridging-traction law

Delamination of composite laminates under mode I loading is usually accompanied by large scale fiber bridging. Characterization of the bridging-traction law is of significant importance in delamination simulations to account for the effect of fiber bridging in such situation. This paper proposed a semi-analytical methodology to determine the bridging-traction law of composite laminates under mode I loading. The enhanced beam theory is physically improved by considering the bending-extension coupling to model the delamination in angle-ply laminates. The strain energy release rate as well as the opening displacement of the initial crack tip, from which the bridging-traction law is derived, are characterized as a function of the crack advance and some integration constants. The effectiveness and applicability of the proposed method are validated by comparing the obtained results with those numerically and experimentally achieved. The proposed approach can conveniently determine the mode I bridging-traction law using only the fundamental material properties and experimental load-displacement data of DCB specimen, which provides some guidelines in bridging-traction law determination of composite laminates under extreme conditions requiring the environmental chambers.

Experimental and numerical investigation of the mixed mode delamination of monolithic laminates exhibiting severe fiber bridging

A recently developed cohesive zone traction-separation formulation for mode I facesheet to core disbonding, which includes the effects of fiber bridging in a novel way, is extended to account for mode II and mixed mode delamination. The pure mode I and mode II behavior of the model is calibrated based on traction separation curves which are extracted from Double Cantilever Beam (DCB) and End Notched Flexure (ENF) experiments utilizing the J integral. An existing mixed mode framework, which requires no further parameters, is used to predict the load displacement curves of Mixed ode Bending (MMB) tests. Very close agreement between numerical predictions and experimental results is observed for all demonstrated mixed mode ratios.

A computational model for simulation of steel fibre reinforced concrete with explicit fibres and cracks

A new formulation is herein proposed to embed discrete fibres and cracks in finite elements. The main features of the fibre behaviour are automatically accounted for, including bond and snubbing effects. Fibres can interact with cracks and are modelled without the need for additional degrees of freedom. A comprehensive constitutive law directly models the two possible fibre failure modes: pull-out and tensile rupture. The bridging effect of fibres crossing active cracks follows a pull-out relation that depends on the current crack width, fibre orientation, relevant mechanical and geometric fibre properties, and quality of surrounding cement-based matrix. Fibres can be randomly positioned inside a structural member using a non-uniform distribution. The effect of crack openings is transmitted to the neighbouring material as rigid body movement. Numerical tests of material and structural scale are simulated to assess the performance of the technique. The model is shown to adequately simulate the complete behaviour of the members without the need for fitting material parameters to capture complex failure mechanisms. The model is also used for a rational justification about the loss of ductility when fibres are used in concrete beams flexurally reinforced with small amounts of longitudinal reinforcement.

A modified mode I cohesive zone model for the delamination growth in DCB laminates with the effect of fiber bridging

Fiber bridging has a significant influence on the delamination propagation behavior in multidirectional composite laminates. Traditional pure mode I bilinear cohesive zone models (CZM) do not consider the effect of fiber bridging and result in an inaccurate simulation on the delamination behavior. This study proposed a physical-based three-linear CZM superposed by two bilinear CZMs, which represent two different phenomena including the quasi-brittle matrix fracture characterized by a higher peak stress and a shorter critical opening displacement, and the fiber bridging characterized by a lower peak stress and a longer critical opening displacement, respectively. The three-linear CZM was implemented in the commercial FE software using a user-subroutine UMAT. Double Cantilever Beam (DCB) tests on the multidirectional composite laminates with 0°/5° and 45°/−45° interfaces conducted in our previous studies are shown to have large-scale fiber bridging in mode I delamination and are used to provide experimental data for calibrating the new CZM. Good agreements between the predicted and tested results can be achieved by adopting this new CZM, demonstrating its applicability on predicting the mode I delamination behavior in composite laminates with the effect of fiber bridging.

Effect of basalt fiber inclusion on the mechanical properties and microstructure of cement-solidified kaolinite

The polypropylene fibers, which are currently attracting enormous attention in various geotechnical applications, carry a risk of aging under an integrated effect of heat, oxygen, light and other environmental factors, causing potentially infrastructure failure. An eco-friendly and biologically inactive material – basalt fiber, which has excellent natural resistance to aging and can eliminate aging-associated disasters, deserves more attention in geotechnical field. However, quite few studies are available on the beneficial reuse of basalt fibers to improve the engineering performance of soils. Therefore, this study aims to incorporate the sustainable basalt fiber and clarify how its inclusion impacts the mechanical properties and microstructure of cemented kaolinite. The experimental programs are comprised of three types of tests, i.e. two to examine the compressive strength and triaxial shear behavior and one to evaluate the microstructure properties. The results indicate that the basalt fiber reinforcement plays an essential role in enhancing the compressive strength and peak deviatoric stress of cemented and uncemented kaolinite. The inclusion of basalt fibers improves the ductility and weakens the brittleness of cemented kaolinite. The compressive strength increases with basalt fiber content and curing time, and reaches the peak at the fiber content of 0.2%, followed by a reduction due to the formation of weak zone at higher fiber content. The peak deviatoric stress is elevated until reaching the maximum at the basalt fiber content of 0.4%, after which further addition of basalt fiber tends to reduce its reinforcing effect. The peak deviatoric stress increases as the basalt fiber length is shortened and the confining pressure is raised. The strength gain of cement-basalt fiber inclusion is much more than the sum of strength increase induced by them individually. The combination of basalt fiber and cement has the virtues of both cement-stabilized and basalt fiber-reinforced kaolinite. The SEM analysis reveals that the mechanical interaction in the form of interface bonding and friction between kaolinite particle, cement hydration product and basalt fiber is the dominant mechanism controlling the reinforcement-cementation benefits. The bridging effect (reinforcement) of basalt fibers and binding effect (cementation) of hydration products make a major contribution to the formation of stable and interconnected microstructure, which results in an evident improvement in the mechanical behaviour of cemented kaolinite. The combination of basalt fiber and cement stabilization would be an innovative and effective method for geotechnical engineering works such as soft ground improvement.

Effect of elevated temperature on axially and eccentrically loaded columns containing Polyvinyl Alcohol (PVA) fibers

Polyvinyl Alcohol (PVA) fiber was developed more than 80 years ago in Japan. They are heavily used in non-structural applications and in Engineered Cementitious Composites (ECC) mainly for beams and thin slabs sections. There are gaps in the research regarding their performance in other structural elements and at elevated temperatures. The aim of this work is to study the behavior of reinforced concrete columns containing PVA fibers after being subjected to elevated temperatures and then loaded either concentrically or eccentrically. A total of thirty-six reinforced concrete columns, having constant longitudinal reinforcement, were experimentally tested under different load eccentricity ratios (0.0, 0.50, and 1.0). Different ratios of PVA, 0.75%, 1.50%, 2.25% were included in the concrete mixes. The studied columns were exposed to elevated temperature before loading. It was observed that columns containing PVA fibers had higher ultimate loads, higher ultimate deflection, less crack widths, higher ultimate deflection, higher energy absorption, and higher temperature resistance compared to normal reinforced concrete columns. In addition, these columns didn’t show any sign of spalling due to the fiber bridging effect of PVA fibers unlike other studied normal reinforced concrete columns without fibers. It was found that addition of 1.50% fiber content showed better performance for centrically loaded columns while this was raised to be 2.25% for eccentrically loaded columns. The ultimate load of the columns exposed to elevated temperature rapidly decreased with increasing the duration of temperature to different magnitudes depending on the percentage inclusion of PVA fibers. It was found that ductility and energy absorption for columns including 1.5% PVA were higher than their companions without fibers after temperature exposure. It was observed that the energy absorption of eccentric columns exposed to temperature for up to two hours was still higher than that of their companions without fibers by 40% for eccentricity ratio of 1.0.

Development of a novel damage approach on the microstructure for modeling woven ceramic matrix composites

AbstractCeramic Matrix Composites (CMC) overcome limitations associated with classical technical ceramics e.g. low fracture toughness and brittle failure under mechanical or thermomechanical loading [1]. Their high temperature stability and low weight makes them attractive for use in various fields, especially aerospace industry, where they improve engine efficiency compared to metal components. However current CMCs lack well established material property design databases for a reliable use in critical aerospace structures. Demonstrating the durability of this relatively new class of materials is the challenge to face and therefore the failure mechanisms need to be investigated further. This contribution deals with the successive development of a woven representative volume element (RVE) for arbitrary CMCs. In contrast to previously developed continuum mechanical or laminate theory based modeling approaches, the introduced model combines various damage formulations. The fiber bridging effect, resulting from the weak interface bond of matrix and reinforcement, is governed by the use of cohesive zone (CZ) elements [2]. Whereas the matrix damage is represented using a continuum mechanical approach [3].

Tensile Behavior Characteristics of High-Performance Slurry-Infiltrated Fiber-Reinforced Cementitious Composite with Respect to Fiber Volume Fraction.

Concrete has high compressive strength, but low tensile strength, bending strength, toughness, low resistance to cracking, and brittle fracture characteristics. To overcome these problems, fiber-reinforced concrete, in which the strength of concrete is improved by inserting fibers, is being used. Recently, high-performance fiber-reinforced cementitious composites (HPFRCCs) have been extensively researched. The disadvantages of conventional concrete such as low tensile stress, strain capacity, and energy absorption capacity, have been overcome using HPFRCCs, but they have a weakness in that the fiber reinforcement has only 2% fiber volume fraction. In this study, slurry infiltrated fiber reinforced cementitious composites (SIFRCCs), which can maximize the fiber volume fraction (up to 8%), was developed, and an experimental study on the tensile behavior of SIFRCCs with varying fiber volume fractions (4%, 5%, and 6%) was carried out through direct tensile tests. The results showed that the specimen with high fiber volume fraction exhibited high direct tensile strength and improved brittleness. As per the results, the direct tensile strength is approximately 15.5 MPa, and the energy absorption capacity was excellent. Furthermore, the bridging effect of steel fibers induced strain hardening behavior and multiple cracks, which increased the direct tensile strength and energy absorption capacity.

Axial behavior of slender steel tube filled with steel-fiber-reinforced recycled aggregate concrete

The increasing annual output of construction waste brings severe space decreasing, resource shortage and environment depravation. Cyclic utilizing the recycled coarse aggregate (RCA) is inevitable. This paper uses the steel-fiber-reinforced recycled aggregate concrete (SRAC) as filling to manufacture CFST columns, called SRACFST columns. A comprehensive study for the axial behavior of 39 slender SRACFST columns is presented. The experimental parameters are the slenderness ratio (λ), steel fiber volume (v), quality replacement rate of regenerated aggregate (RAR), concrete strength grade and diameter-thickness ratio of steel tube (D/t). Failure mode, axial load-lateral deflection behavior, axial load-strain response and ultimate capacity are researched. The results show that slender SRACFST columns present the similar compressive behavior to the common slender CFST columns. The defect of RAC can be compensated by the confinement effect of steel tube and the bridging effect of steel fibers. With the rise in slender ratio, the confinement of steel tube and steel fibers is faded out.

Fiber Bridging Induced Toughening Effects on the Delamination Behavior of Composite Stiffened Panels under Bending Loading: A Numerical/Experimental Study.

In this paper, a research activity, focused on the investigation of new reinforcements able to improve the toughness of composite materials systems, is introduced. The overall aim is to delay the delamination propagation and, consequently, to increase the carrying load capability of composite structures by exploiting the fiber bridging effects. Indeed, the influence of fiber bridging related Mode I fracture toughness (GIc) values on the onset and propagation of delaminations in stiffened composite panels, under three-point bending loading conditions, have been experimentally and numerically studied. The investigated stiffened panels have been manufactured by using epoxy resin/carbon fibers material systems, characterized by different GIc values, which can be associated with the material fiber bridging sensitivity. Experimental data, in terms of load and delaminated area as a function of the out-of-plane displacements, have been obtained for each tested sample. Non-Destructive Inspection (NDI) has been performed to identify the debonding extension and position. To completely understand the evolution of the delamination and its dependence on the material characteristics, experiments have been numerically simulated using a newly developed robust numerical procedure for the delamination growth simulation, able to take into account the influence of the fracture toughness changes, associated with the materials’ fiber bridging sensitivity. The combined use of numerical results and experimental data has allowed introducing interesting considerations of the capability of the fiber bridging to substantially slow down the evolution of the debonding between skin and reinforcements in composite stiffened panels.

Theoretical analysis on optimal fiber-matrix interfacial bonding and corresponding fiber rupture effect for high ductility cementitious composites

High ductility cementitious composites (HDCCs) exhibit robust tensile ductility accompanied by multiple cracking and a tight crack width. The constitutive relations of fiber/matrix interfacial bonding has a great influence on the mechanical properties of HDCCs. Appropriate interfacial bonding can give full play to the bridging effect of fibers, whereas improper interfacial bonding only achieves inferior, or even no ductility. The purpose of this study is to elaborate on the optimal range of the fiber/matrix interfacial bonding strength based on the micromechanics theory with consideration to fiber rupture. As typical fibers used in HDCCs, like PVA fiber, PET fiber, PE fiber and steel fiber were selected as case studies. Furthermore, a source of confused question is clarified if all the fibers in HDCCs exhibit pullout behavior rather than rupture behavior, which is the optimal case. The analysis results show that moderate volume fractions of fibers ruptured can contribute to obtain stronger fibers bridging capacity and can achieve higher ductility for HDCCs. Finally, the experimental value of fiber/matrix interfacial friction τ0 is shown to be in an optimal range, and the ductility of the PVA-HDCC and PE-HDCC can reach 2.7 ± 0.3% and 4.8 ± 1.0%, respectively. These research findings can be used as an important guide on fiber surface treatment and fiber/matrix interface tailoring.

Effect of basalt fibers on the flexural behavior of concrete beams reinforced with BFRP bars

This research investigates experimentally the effects of adding different types of fibers to the concrete mixes on the flexural behavior of concrete beams reinforced longitudinally with BFRP bars. The main aim is to study the feasibility of using newly developed basalt microfibers to improve the concrete response. Twelve beams were prepared and cast using plain, basalt fibers, and synthetic fibers-reinforced concrete (FRC) with a 40 MPa target compressive strength. Basalt fibers of two different lengths of 24 mm and 12 mm were considered. Flexural tests were conducted on each of the BFRP-FRC beams using a four-point test setup. The test matrix also included FRC beams reinforced with GFRP bars as well as conventional steel rebar for comparisons. Results showed that introducing basalt fibers to the concrete increased curvature ductility of these beams. A noticeable improvement in the flexural capacities was also recorded due to the delay in concrete failure strain (beyond 0.003) at the compression zone, which helped the BFRP bars attained a higher ultimate strength. The opening of cracks and their deep propagation was effectively restrained by the bridging effect of the basalt fibers, which kept the crack widths lower than the allowable limit of 0.7 mm at service.

Acoustic Emission Characterization of Hybrid Fiber Reinforced Cellular Concrete Under Direct Shear Loads

Acoustic emission (AE) is employed in this study to understand the failure process in fiber-reinforced cellular concrete (FRCLC) subjected to direct shear load. Synthetic polyolefin fibers are used as reinforcement in FRCLC blocks, and their influence on the shear-fracture process is investigated. AE parameters are investigated to assess the effectiveness of fibers in performance improvement of shear strength and toughness of CLC. In total, 24 CLC specimens are tested under direct shear. Effect of fiber dosage and combinations of macro and microfibers are considered as study parameters. Shear crack bridging effect of fibers during the process of shear-slip is investigated. Test results indicate that AE and shear fracture energy increase with increasing fiber dosage. It is observed that discontinuous structural synthetic fibers significantly improve the ultimate shear strength, residual strength, ductility, stiffness, and toughness of CLC. Also, the structural synthetic fibers reduced the shear crack width and shear-slip of CLC. AE parameters such as counts, energy, and 3D-crack source location are presented to illustrate the role of different fiber dosages on the direct shear response. Shear crack location was found to be consistent with the observed failure planes in the specimens. AE data analysis reveals that the number of mode II type events increased with increasing fiber dosage due to increased fiber pullout. Besides, mode I type events also increased as the failure mode changed from a single split crack to distributed cracking.

Fracture Toughness and Strength of the Interface of an Intrinsic Hybrid Laminate

Unidirectional glass fiber reinforced plastic (U-GFRP) represents itself as an excellent lightweight structural material due to its high tensile strength Rm and its low density ρ. A major drawback, however, is the relative weakness of the matrix under more complex, multi-axial loading conditions. Therefore, a local hybridization of U-GFRP seems to be an adequate measure to enhance the robustness of the material. First, the material testing program sets the focus on the investigation of the strength of the interface between U-GFRP and the additional constituent steel. Hence, the energy release rate GI, the static shear strength ts as well as the cyclic shear strength τs,cyclic of the considered interface have been determined at room temperature RT and at an elevated temperature of T = 80° Additionally, aged specimens have been statically tested as well. The results show up that primers, such as silane, are leading to a good adhesion between the constituents. Furthermore, a fiber bridging effect is apparent which leads to an increase of the energy release rate GI with the growth of the length a of the crack. A power law is well suited to describe this strengthening and its exponent n serves as a further measure to describe the strength of the interface. Generally, ageing of the material and straining at an elevated temperature harm the performance of the intrinsic hybrid material.

Research on eccentric compression of ultra-high performancefiber reinforced concrete columns

To study the eccentric compression behavior of ultra-high performance fiber reinforced concrete (UHPFRC) columns, six UHPFRC columns and one high-strength concrete (HSC) column were tested. Variation parameters include load eccentricity, volume of steel fibers and stirrup ratio. The crack pattern, failure mode, bearing capacity, and deformation of the specimens were studied. The results showed that the UHPFRC columns had different failure modes. The large eccentric compression failure mode was the longitudinal tensile reinforcements yielded and many horizontal cracks appeared in the tension zone. The small eccentric compression failure mode was the longitudinal compressive reinforcements yielded and vertical cracks appeared in the compressive zone. Because of the bridging effect of steel fibers, the number of cracks significantly increased, and the width of cracks decreased. The load-deflection curves of the UHPFRC columns showed gradually descending without sudden dropping, indicating that the specimens had better deformation. The finite element (FE) analysis was performed to stimulate the damage process of the specimens with monotonic loading. The concrete damaged plasticity (CDP) model was adopted to characterize the behaviour of UHPFRC. The contribution of the UHPFRC tensile strength was considered in the bearing capacity, and the theoretical calculation formulas were derived. The theoretical calculation results were consistent with the test results. This research can provide the experimental and theoretical basis for UHPFRC columns in engineering applications.