Fiber Volume Ratio Research Articles

Experimental study on mechanical properties of steel and steel fiber reinforced concrete beams

SummaryAccording to the construction difficulties in steel reinforced concrete (SRC) structures, rebar cages were discretized into steel fibers to form steel and steel fiber reinforced concrete (SSFRC) structures. The 18 SSFRC beams without rebar cages were tested under bending, and the effect of the steel fiber volume ratio (ρsf), shaped steel ratio (ρss), and shear span ratio (λ) on mechanical properties were investigated. Increasing ρsf could not only turn shearing failure and debonding failure into bending failure, and effectively reduce the sudden decrease of load, but also enhance the bearing capacity, ductility, and damage resistance of specimens to a certain extent. As the ρss ascended, the mechanical properties were obviously improved. However, ρsf should be accordingly increased to avoid adverse effects of excessive ρss. The specimen with small λ had the better bearing and energy dissipation capacity and poor ductility. A large λ meant that ρss and ρsf should be appropriately increased to prevent premature failure of specimens.

Application of steel fiber-reinforced concrete for slab lagging at underground mines in Quang Ninh

Steel Fiber-Reinforced Concrete (SFRC) is an advanced material studied and used in some developed countries in the world in recent years. The characteristics of this concrete are intensive compression, high tensile and tolerance strength, higher repeated loads, and long-term durable stability. Steel fibers were used to manufacture SFRC because of their outstanding characteristics. The durability of SFRC should be improved and the disadvantages of traditional concrete should be reduced. To produce inserts in the support structure, SFRC must be applied. Because 60÷70% of tunnels are being constructed for underground coal mines of Vietnam National Coal and Mineral Group (TKV) currently use. SPV steel frame support in combination with reinforced concrete inserts steel. To increase the plaque's capacity and durability in the future, a study must be done to create new, very intense concrete materials. This study investigated how the ratio and compressive strength of steel fibers affected the flexural characteristics of SRFC. To achieve this, 30 MPa strength SFRC with 0.5%, 1.0%, and 1.5% fiber fractions were made and evaluated. This study’s experimental results can be summarized as follows: according to the compression experimental results, the compressive strength and elastic modulus of SFRC were not considerably impacted by the steel fiber volume ratio; The experimental results from the bending tests show that for concrete with a strength of 30 MPa, the proportion of steel fibers of 1.0% has higher flexural strength and toughness than the proportion of steel fibers of 0.5% and 1.5%; A comparison of the test at 28 days of age with the (ACI 211.1-91, 1991) was completely satisfied.

Analytical simulation of effects of local mechanisms on tensile response of ceramic matrix minicomposites

A micromechanics-based method based on a fiber shear lag analysis was developed to analyze the fast-fracture response of uncoated ceramic matrix minicomposites. The model was applied to two SiCf/SiC fiber minicomposite systems that were fabricated by Rolls-Royce High Temperature Composites, Inc., and the University of Connecticut. The analysis approach accounts for the fact that on average, the cracks in an actual minicomposite often have an irregular geometry. The effects of local variations in the fiber volume ratio on the composite response were also investigated. Parametric studies were performed to investigate the effects of the interfacial shear stress, global fiber volume fraction, and percentage of the composite that remains uncracked on the proportional limit stress and the composite secondary modulus. This work will facilitate an increased understanding of the key material mechanisms that take place during fast-fracture loading.

Mechanical properties of fully recycled coarse aggregate concrete with polypropylene fiber

Incorporating polypropylene fiber as an additive material into the mixture can effectively improve the mechanical properties of concrete. In this paper, in order to investigate the mechanical properties of fully recycled coarse aggregate (FRCA) concrete with PP fiber, four groups of specimens with different volume ratio of PP fiber were designed and manufactured to conduct experiments of uniaxial compression and bending respectively. Based on the test results, the influence of volume ratio of PP fiber on the compressive and flexural mechanical properties of FRCA concrete were analyzed. The results showed that the integrity of compression specimens with PP fiber was better after failure and the flexural failure of the specimens without fiber or with PP fiber was brittle after the peak value. Moreover, with the increase of volume ratio of PP fiber, the slump of specimens presented a downward trend, the cube compressive strength increased continuously, and the cylinder compressive strength first decreased and then increased. Besides, with the increase of volume ratio of PP fiber, the static pressure elastic modulus increased as a whole, and the flexural strength increased.

Effect of fiber volume ratio on flexural behavior of RC beam with novel HFRP rebar and steel rebar

In the experiment conducted, a total number of ten reinforced concrete (RC) beams were analyzed to investigate the flexural performance of concrete beams reinforced with locally fabricated hybrid fiber-reinforced polymer (HFRP) bars and steel bars. The yield load and post-yield stiffness of specimens were the main mechanical properties variables that have been carried out during specimens design. Furthermore, the effect of the fiber volume ratio in the HFRP rebar and the reinforcement ratios on the flexural behavior of specimens has been studied. The experimental results show a significant improvement in the flexural load capacity due to the increases of HFRP reinforcement ratio than steel bars. The flexural capacity of beam specimens with 0.47% of HFRP reinforcement ratio and (0.24%, 0.48%, 0.71%) of steel bar, were 169kN, 198kN, and 221kN respectively, while with 0.23% HFRP bar and (0.36%, 0.6%, 0.84%) of steel ratio were 116kN, 150kN, and 138kN respectively. Further, the HFRP bar with a high volume ratio of carbon fiber improves the flexural strength, although the HFRP bar with a high volume ratio of basalt fiber enhances the ductility behavior of specimens. A finite element model (FEM) analysis was conducted using Abaqus Software. It was observed that the FEM analysis perfectly generate the results that matched with the experiment results. Conclusively, an analytical method was suggested to predict flexural strength and compared with experimental results. The analytical flexural strength was in good agreement with the experimental results.

Study on Toughening and Temperature Sensitivity of Polyurethane Cement (PUC).

Polyurethane cement (PUC) is now commonly used in the reinforcement of old bridges, which exhibit various issues such as poor toughness, temperature-sensitive mechanical properties, and brittle failure. These problems can lead to the failure of the reinforcement effect of the PUC on old bridges in certain operating environments, leading to the collapse of such reinforced bridges. In order to alleviate these shortcomings, in this study, the toughness of PUC is improved by adding polyvinyl alcohol (PVA) fiber, carbon fiber, and steel fiber. In addition, we study the change law of the flexural strength of PUC between −40 °C and +40 °C. The control parameters evaluated are fiber type, fiber volume ratio, and temperature. A series of flexural tests and scanning electron microscope (SEM) test results show that the flexural strength first increases and then decreases with the increase in the volume-doping ratio of the three fibers. The optimum volume-mixing ratios of polyvinyl alcohol (PVA) fiber, carbon fiber, and steel fiber are 0.3%, 0.04% and 1%, respectively. Excessive addition of fiber will affect the operability and will adversely affect the mechanical properties. The flexural strength of both fiber-reinforced and control samples decreases with increasing temperature. Using the flexural test results, a two-factor (fiber content, temperature) BP neural network flexural strength prediction model is established. It is verified that the model is effective and accurate, and the experimental value and the predicted value are in good agreement.

Experimental Study on the Bond-Slip Behavior of Steel-Steel Fiber Recycled Aggregate Concrete

To study the bond–slip behavior of steel–steel fiber recycled aggregate concrete, push-out tests of 16 specimens were carried out using steel fiber volume ratio, steel fiber aspect ratio, steel protective layer thickness and steel embedded length as the design parameters. In addition, the crack patterns, steel strain distribution, and load–slip curves were studied, in addition to the bond strengths of the interface between the steel–steel fiber and recycled aggregate concrete. The results showed that the fracture cracks of the specimens mainly included bond cracks and expansion cracks. For the load increase stage, the maximum strain of the steel flange was near the loading end of the steel and decreased toward the free end, while the strain changed linearly for the load descending stage. The bond–slip process between the steel–steel fiber and recycled aggregate concrete included five stages, which consisted of slight-slip, slow-slip, accelerated-slip, the sharp-slip and load-steep-drop stage, and gentle-slip stage. Additionally, the influencing factors of bond strength were analyzed, where the bond strength increased first and then decreased with increasing steel fiber volume and steel fiber aspect ratios, and the bond strength increased with increasing steel protective layer thickness. The ultimate bond strength decreased slightly with increasing steel embedded length. Finally, the equation for calculating the characteristic bond strength of the steel–steel fiber recycled aggregate concrete was established, which showed that the calculation results were in good agreement with the test results.

Compressive behavior of reinforced steel-PVA hybrid fiber concrete short columns after high temperature exposure

To investigate the axial compression mechanical properties of steel-PVA hybrid concrete short columns after high temperature, three groups of 15 specimens (without or mixed with steel and PVA fibers) were tested in this paper. These specimens were subjected to quasi-static loading compressive loading after exposure to elevated temperature. The results indicated that as the temperature increased, the hydration reaction occurred in the concrete, and specimen surface color gradually changed from light gray to grayish white, and its mass loss rate gradually increased. The mechanical properties of short columns of hybrid fiber concrete were significantly affected by the elevated temperature. However, the compressive bearing capacity of specimens was increased by the mixed fibers after elevated temperatures, compared to the ordinary concrete. Meanwhile, specimen with more steel fibers performed better on bearing capacity. The PVA fiber effectively reduced the formation and expansion of cracks in hybrid fiber concrete after high temperature and enhanced its ductility. A suggested reduction coefficient was introduced by considering the influence of temperature and fiber volume ratio, and the calculated value of axial compression bearing capacity of the specimen was in good agreement with the experimental value.

Experimental and theoretical study on flexural behavior of high strength concrete encased steel beams with steel fibers

In this study, the flexural behavior of high strength concrete encased steel beams with steel fibers (HSCSBSF) under bending is investigated. The experiments of four HSCSBSF including one HSCSBSF without steel fiber (0% volume ratio of steel fiber) are carried out to investigate the effect of the volume ratio of steel fiber on the flexural behavior of HSCSBSF. All specimens fail by the yielding of reinforcement in tension zone and the crushing of concrete in compression zone. Due to the positive effect of steel fiber on the internal bonding strength of concrete, HSCSBSF with higher volume ratio of steel fiber shows higher cracking load. The bearing capacity (bending capacity) of HSCSBSF increases by 34.3% when the volume ratio of steel fiber varies from 0% to 2%. Compared with HSCSBSF with 0% volume ratio of steel fiber, the flexural stiffness of HSCSBSF with higher volume ratio of steel fiber is obviously improved and the ductility coefficient (the ratio of the displacement at failure load to the displacement at the yield load) of HSCSBSF with 2% volume ratio of steel fiber increases by 25%. Based on the material test of concrete, a value for the influence coefficient of steel fiber on the tensile strength of concrete is suggested. A model for predicting the bearing capacity of HSCSBSF is then derived from theoretical analysis of HSCSBSF. A good agreement between the proposed model and various test data is made.

Structural behavior of MDF beams reinforced by unidirectional glass fiber reinforced thermoset polyurethane outer layers

In this study, the structural behavior of medium density fiber board (MDF) beams reinforced by unidirectional glass fiber reinforced thermoset polyurethane outer layers is investigated by conducting beam bending and vibration tests followed by a parametric study. First, the MDF material properties are determined by 3 point bending and cantilever beam vibration tests. Then the same tests are conducted on the composite sandwich beam specimens produced by hand layup technique and the level of increase in overall stiffness and the ultimate failure loads are determined. The experimental results obtained are found out to be in good agreement with the analytical results and the numerical results obtained using a 1D shear deformable beam model. Finally, a parametric study is conducted to determine the influence of FRP reinforcement for different span lengths and fiber volume ratios. The results obtained from this study show that reinforcing MDF beams by FRP outer layers may considerably increase the flexural stiffness for all span lengths but the ultimate failure load may not be increased for short span lengths due to core shear failure, especially when there is no constraint on maximum displacement.

Experiment and molecular dynamics simulation of functionalized cellulose nanocrystals as reinforcement in cement composites

This study evaluated the potential effect of cellulose nanocrystal and coated polyethylene fiber on the mechanical properties of mortar. Two kinds of cellulose nanocrystals (CNC) directly as Nano-materials, and indirectly as film coated onto the polypropylene fibers were employed as cement-based reinforcement materials. The fluidity, flexural and compressive strength, and the microstructure of each specimen were measured. In the direct method, mortar mixed with the CNC containing carboxyl groups (CNC-C) showed superior properties compared to the CNC containing sulfo groups (CNC-S). The addition of CNC impacted the process of hydration and compactness of hydration products. The results of X-Ray polycrystalline diffractometer (XRD) and heat of hydration showed that CNC accelerated hydration process. Energy spectrum analysis (EDS) measured ratio of calcium to silicon (C/S) of calcium silicate hydrate (C-S-H) and proved that CNC-C increased the tightness of C-S-H while CNC-S decreased. The results of scanning electron microscopy (SEM) indicated that cellulose nanocrystals were interspersed in C-S-H, forming Nano-bridge and arresting Nano-crack. In the indirect method, the maximum increase in flexural strength of sample between all groups was the specimen that adding 0.3% (volume ratio of fiber to mortar) of CNC-C coated polypropylene fibers. The flexural and compressive strength of the mortar were increased by 22.81% and 10.65% compared to the control, respectively. The results of SEM indicated that coating enhanced bond of the fibers/matrix. Molecular dynamics simulation (MD) analyzed the binding energy, microstructure, dynamic characteristics and adsorption conformation between two CNCs and C-S-H at the molecular scale. MD presented clearly that the adsorption energy between CNC-S and C-S-H was much smaller than CNC-C and C-S-H. This was identical with CNC-C enhancing the mechanical properties of the mortar and CNC-S reducing the mechanical properties.

Experimental Research on Fracture Characteristics of Reactive Powder Concrete in Different Volume Content of Steel Fiber

The fracture characteristics of reactive powder concrete in different volume content of steel fiber are researched in this paper, combining with the photoelastic coating method and the mathematical analytical software MATLAB. More precisely, the wholly integrated initiation, stable propagation, and final failure stages of precast cracks in three-point bending specimens of reactive powder concrete in different volume content of steel fiber are directly recorded and systematically analyzed. Besides, the photoelastic fringe distribution graphs from the vicinity of the precast cracks of specimens are obtained. Based on the experimental results and fracture mechanics theory, the mechanical property of reactive powder concrete, fracture energy, ductility index, initial fracture toughness, and unstable fracture toughness are quantitatively and qualitatively analyzed. The research achievements indicate that there is a stable crack propagation process before the instability failure of the three-point bending beam specimen of reactive powder concrete. The fracture process of the structure includes three stages, namely, the crack initiation, stable propagation, and instability failure. The order of the photoelastic fringe, critical effective crack length, crack initiation load, and maximum load of test parameters in the three-point bending beam specimen of reactive powder concrete increases with the increase of the fiber volume ratio. Based on the numerical treatment for the whole curves of each specimen group, the softening curve and the double fracture parameters of reactive powder concrete are obtained. Besides, the calculated critical effective joint length, initiation toughness, toughness increment, and unstable fracture toughness increase with the increase of the steel fiber volume ratio, by analyzing the measured initiation load, maximum load, and critical effective joint length. The research results can be treated as an important basis and reference for the engineering design and safety assessment of reactive powder concrete.

Translaminar mode-I fracture toughness experiment of pultruded GFRP laminates using extended compact tension specimen

This paper conducted experiments and theoretic analysis of the fracture performance of pultruded GFRP (Glass Fiber Reinforced Polymers) laminates. The mode-I fracture toughness of pultruded GFRP laminates was evaluated by the eccentrically loaded, Extended Compact Tension (ECT) specimen. The geometry of specimen and experimental procedure refer to ASTM E1922. A total of 16 specimens were tested, which included 0° and 90° roving orientation. Finite element analysis with the Virtual Crack Closure Technique (VCCT) was implemented to calibrate the experimental results. A correction function for normalized notch length was proposed for pultruded GFRP translaminar fracture toughness. Carpet plot was designed to discuss the relationship between fiber volume ratio and fracture toughness, which demonstrated that the fracture toughness strongly correlated with the fiber volume ratio. Also, the effect of fraction of 0° layers on fracture toughness and material orthotropy was studied. The relationship of material orthotropy parameter and fracture toughness was discussed.

Investigation of the Fabrication Suitability, Structural Performance, and Sustainability of Natural Fibers in Coreless Filament Winding.

Coreless filament winding is an emerging fabrication technology in the field of building construction with the potential to significantly decrease construction material consumption, while being fully automatable. Therefore, this technology could offer a solution to the increasing worldwide demand for building floor space in the next decades by optimizing and reducing the material usage. Current research focuses mainly on the design and engineering aspects while using carbon and glass fibers with epoxy resin; however, in order to move towards more sustainable structures, other fiber and resin material systems should also be assessed. This study integrates a selection of potential alternative fibers into the coreless filament winding process by adapting the fabrication equipment and process. A bio-based epoxy resin was introduced and compared to a conventional petroleum-based one. Generic coreless wound components were created for evaluating the fabrication suitability of selected alternative fibers. Four-point bending tests were performed for assessing the structural performance in relation to the sustainability of twelve alternative fibers and two resins. In this study, embodied energy and global warming potential from the literature were used as life-cycle assessment indexes to compare the material systems. Among the investigated fibers, flax showed the highest potential while bio-based resins are advisable at low fiber volume ratios.

Multiple objective optimization design of hybrid composite structures considering multiple-scale uncertainties

A multi-objective uncertainty optimization design methodology of hybrid composite structures considering multiple-scale uncertainties is presented in this paper. The hybrid composite structures comprise of multiple materials with different types and volume ratios of matrix and fibers. The objective is to maximize the first-order natural frequency and frequency gap with the cost constraint, the micro-scale material parameters of matrix and fibers are considered as uncertain but bounded variables, and the optimization variables are stacking sequence and material patches (material selection in every patch of composite structures). Firstly, the uncertainty propagation analysis is implemented based on representative volume element method, and the macro material uncertainties are quantified based on neural network model. Furthermore, the multiple objective robust optimization design function is constructed based on the uncertainty analysis results of first-order natural frequency, frequency gap, and the total cost. An adaptive nondominated sorting genetic algorithm II (NSGA-II) method is proposed to optimize the stacking sequence and material patches simultaneously. The engineering examples of 9-layer laminated plate and conical cylindrical shell show that the proposed methodology can make full use of hybrid composite structures to improve the vibration characteristics while maintaining the low material cost.

Research on mechanical properties of ultra-high performance fiber reinforced cement-based composite after elevated temperature

This research investigated the mechanical properties of ultra-high performance fiber reinforced cement-based composite (UHPFRC) after exposure to elevated temperatures ranging from 200 to 300 °C. The cube compressive strength, axial compressive strength, and flexural strength were studied with 150 specimens. The effects of volume ratio of steel fiber, elevated temperature, and high temperature duration on the properties of UHPFRC were discussed in the present study. The result indicated that the compressive strength and axial compressive strength were improved after the UHPFRC was subjected to the elevated temperature. However, the effect of elevated temperature was not significant on the flexural strength. The effects of steel fiber volume ratio on the properties of UHPFRC were obvious. The cube compressive strength, axial compressive strength, and flexural strength were greatly improved with the rising of steel fiber volume ratio. Furthermore, the calculation formulas of the cube compressive strength, axial compressive strength, and flexural strength of UHPFRC were proposed in this presented study. The calculated results were compared with the test results, which indicated that the calculated formulas were greatly agreed with the test.

Study on bonding compression-shear performance between industrial green fiber-reinforced concrete and old concrete

Industrial green fiber-reinforced concrete, a new hybrid high performance environmental protection material, can be made by adding recycled steel fibers into concrete in a certain proportion. As a composite material used in the construction industry, it can provide a new research direction for national green and sustainable development. This paper studied the interface bonding mechanism of normal steel fiber-reinforced old and new concrete and industrial green fiber-reinforced concrete and old concrete by using a self-made new fixture, and discussed the influence of compressive stress, types of steel fibers and recycled steel fiber content on the bonding compression-shear performance of specimens. The results show that the bonding compression-shear performance of specimens gradually increases with the increases of the compressive stress acting perpendicular to the shearing surface within the range of low compressive stress, and when the compressive stress is from 0.2 MPa to 1.0 MPa, the increased amplitude of the bonding compression-shear performance of specimens gradually increases, when the compressive stress is from 0.6 MPa to 1.0 MPa, the increased amplitude of the bonding compression-shear performance of specimens reaches the maximum, and when the compressive stress is from 1.0 MPa to 1.4 MPa, the increased amplitude of the bonding compression-shear performance of specimens decreases. Under the same conditions, the effect of the recycled steel fibers on improving the bonding compression-shear performance between old and new concrete is better than normal steel fibers. The bonding compression-shear performance between old and new concrete gradually increases with the increases of the volume ratio of recycled steel fibers, and when the fiber content is from 0.0 % to 1.0 %, the increased amplitude of the bonding compression-shear performance of specimens gradually increases, when the fiber content is from 0.5 % to 1.0 %, the increased amplitude of the bonding compression-shear performance of specimens reaches the maximum, and when the fiber content is from 1.0 % to 1.5 %, the increased amplitude of bonding compression-shear performance of specimens decreases. The simulation results of industrial green fiber-reinforced concrete and old concrete specimens with fiber content of 1.5 % under different compressive stresses are basically in agreement with the experimental results. This study can provide references for the research of bonding compression-shear behavior of steel fiber-reinforced old and new concrete materials and the recycling of steel wire from waste tires.

A Low-Cost Filament Winding Technology for University Laboratories and Startups.

This paper systematically explains the methodology and results of empirical work on the development of a low-cost filament winding technology for manufacturing axisymmetric polymer composite structures with a high length-to-diameter ratio, such as tubes, motor casings, and pressure vessels. The principal objective was to examine the experiences and most optimal practices in the development of computer-controlled equipment and auxiliary tooling for the wet filament-winding process. To preclude expensive commercial software for the automated control of a winding machine, analytical equations were derived for the winding trajectory of a four-axis filament-winding machine. The feasibility of the proposed equations was successfully validated by laying the fiber along the geodesic path marked on the surface of a cylindrical mandrel with hemispherical ends. Moreover, the carbon/epoxy cylindrical casings with hemispherical ends and port openings of the same diameter were wound to determine the thickness distribution in the hemispherical dome. The fiber volume ratio in the wound composite parts was evaluated using an optical technique.

Residual strength and toughness properties of 3D, 4D and 5D steel fiber-reinforced concrete exposed to high temperatures

Conventional single-hooked (3D) steel fibers are one of the most widely used fibers to improve the strength, ductility and toughness properties of plain concrete. Recently, multi-hook 4D and 5D steel fibers with modified end geometries have been widely used in concrete applications as an alternative to 3D conventional steel fibers. The primary aim of this study was to compare mass loss, compressive and flexural strength, and toughness capacities of 3D, 4D and 5D steel fiber-reinforced concrete (SFRC) at room conditions and after high-temperature effects. Fibers were added to cement mortars at 0.5% and 1.5% by volume. All specimens were exposed to temperature effects of 300, 500 and 800 °C. According to the results obtained, the residual strength and toughness capacities of control and 3D, 4D and 5D SFRC specimens decreases significantly at 500 and 800 °C. However, when compared to control concrete, 3D, 4D and 5D SFRC specimens have higher residual compressive and flexural strength and residual toughness capacity after high-temperature effects. Furthermore, 5D steel fibers are more effective than 3D and 4D steel fibers to enhance the residual compressive and flexural strength and residual toughness capacity of concrete due to superior end geometry and higher tensile strength. In addition, this increase was more pronounced when the fiber volume ratio increased from 0.5% to 1.5%.

Experimental study on bearing capacity of steel and steel fiber reinforced concrete composite beams without rebar cages

In consideration of the interference between H-shaped steel and rebars and the difficulty of concrete pouring in SRC structure, steel fibers rather than the rebar cage in SRC beam are used to form the steel and steel fiber reinforced concrete (SSFRC) beams. Based on the two-point symmetrical loading experiments of 18 SSFRC specimens without rebar cages, the failure mode and load–deflection curve of each specimen were obtained. Thus, the effects of shear span ratio, H-shaped steel ratio and steel fiber volume ratio on the mechanical properties of beams were investigated. With the increase of the shear span ratio, the bearing capacity of the specimens presented a decreasing trend. Benefitting from the “bridging” effect of steel fibers, the failure mode of the specimen was less affected by the shear span ratio. When H-shaped steel ratio was greater, the bending and shear resistance of H-shaped steel could be fully utilized. Additionally, the composite action between materials was weakened when the thickness of concrete cover decreased. Increases in the steel fiber volume ratio could delay the elongation of cracks and reduce the sudden decrease of bearing capacity caused by the damage of the bonding interface between H-shaped steel and SFRC, therefore improving the bearing capacity. According to the superposition principle, the shearing capacity formula of SSFRC beam was proposed. By introducing the bond coefficient and considering the coupling effect of different parameters on the collaborative work of H-shaped steel and SFRC, the calculation formula of bending capacity with high accuracy was obtained. The coefficient could be used to objectively and quantitatively identify or predict the failure type of specimens, providing reference for engineering design.