Superior to traditional welded studs, high strength friction-grip bolted shear connectors facilitate the assembling and demounting of the composite members, which maximizes the potential for efficiency in the construction and retrofitting of new and old structures respectively. Hence, it is necessary to investigate the structural properties of high strength friction-grip bolts used in steel concrete composite beams. By means of push-out tests, an experimental study was conducted on post-installed high strength friction-grip bolts, considering the effects of different bolt size, concrete strength, bolt tensile strength and bolt pretension. The test results showed that bolt shear fracture was the dominant failure mode of all specimens. Based on the loadslip curves, uplifting curves and bolt tensile force curves between the precast concrete slab and steel beam obtained by push-out tests, the anti-slip performance of steel-concrete interface and shear behavior of bolt shank were studied, including the quantitative analysis of anti-slip load, and anti-slip stiffness, frictional coefficient, shear stiffness of bolt shank and ultimate shear capacity. Meanwhile, the interfacial anti-slip stiffness and shear stiffness of bolt shank were defined reasonably. In addition, a total of 56 push-out finite element models verified by the experimental results were also developed, and used to conduct parametric analyses for investigating the shear behavior of high-strength bolted shear connectors in steel-concrete composite beams. Finally, on ground of the test results and finite element simulation analysis, a new design formula for predicting shear capacity was proposed by nonlinear fitting, considering the bolt diameter, concrete strength and bolt tensile strength. Comparison of the calculated value from proposed formula and test results given in the relevant references indicated that the proposed formulas can give a reasonable prediction.
Ying Xing — College of Civil Engineering, Hunan University, Changsha, 410082, China/ College of Civil Engineering, Taiyuan University of Technology, Taiyuan, 030024, China
Yanbin Liu — College of Civil Engineering, Taiyuan University of Technology, Taiyuan, 030024, China
Caijun Shi — College of Civil Engineering, Hunan University, Changsha, 410082, China
Zhipeng Wang — Economic & Technology Research Institute of State Grid Shandong Electric Power Company, Jinan 250021, China
Qi Guo — College of Civil Engineering, Taiyuan University of Technology, Taiyuan, 030024, China
Jinfeng Jiao — College of Civil Engineering, Taiyuan University of Technology, Taiyuan, 030024, China
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