高强钢板组合单边螺栓抗剪性能试验

To investigate the shear bearing capacity and failure mechanism of a high-strength steel plate-composite blind bolt, experiments were conducted on 29 specimens. Two types of steel, Q345B and Q460C, were selected, along with two grades of high-strength bolts, namely, 10. 9 and 12. 9, and five specifications, namely, M20, M24, M27, M30, and M33. The experiments revealed two failure modes: bolt-shear failure and steel-plate failure. The results indicate that the pretension of bolts has a minor effect on the ultimate shear bearing capacity but a significant effect on peak displacement. When the steel plate fails, specimens with pretension exhibit a 40% increase in peak displacement compared with those without pretension. Within the scope of this experiment, the combination of 12. 9-grade bolts with Q460 steel yielded the optimal shear bearing capacity, fully leveraging the strength of high-strength steel while exhibiting better deformation capability with Q345 steel. The combination of 10. 9-grade bolts with Q460 steel resulted in the smallest peak displacement, whereas those with Q345 steel resulted in the lowest shear bearing capacity. Shear bearing capacity is positively correlated with edge distance. When connecting beam-column joints with steel plate-composite single-sided bolted connections, the edge distance can still be designed and calculated using the minimum edge distance specified in the standard. It is recommended to use 0. 40 times the minimum tensile strength of bolts (f_u^b) as the design value of bolt-shear strength (f_v^b), which is validated as reasonable in this study.