Study on bearing capacity of blind bolted T-shaped plate joints in composite CFST structures
Blind bolted T-shaped plate joints with good force transfer performance and high seismic performance,can make full use of the section characteristics of double steel tubes in composite concrete-filled steel tubular columns.Cyclic loading tests and numerical simulations on five blind bolted joints were conducted.There were three types of deformation characteristics of the T-shaped plate due to its different ribbed forms,but all the failure modes of the joints were plastic deformation of steel beams after T-shaped plates yielded.Numerical simulation results agreed well with the experimental results.A tensile model of the T-shaped plate was established according to the force-transferring mechanism based on the results of experiments and simulations.The bending bearing capacity of T-shaped plate flanges and stiffeners was calculated respectively,and the ultimate bearing capacity of the joint was calculated.The error between the calculated results and the experimental results is very small,and they are very close to the numerical simulation results.The results show that the calculation formula based on the tensile model of a T-shaped plate is suitable for the case of strength matching between T-shaped plates and blind bolts.The rib form of T-shaped plates has the greatest influence on the ultimate bearing capacity of the joint,followed by the flange thickness of T-shaped plates,and the web thickness of T-shaped plates has little influence.The maximum critical value and the best matching value between the diameter of the blind bolt and the flange thickness of T-shaped plates are obtained,which provides a theoretical reference and design basis for the application of this type of joint in composite structures.
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维普
