Ⅱ型截面双层组合梁摩擦型螺栓连接节点弯矩分配系数OA北大核心CSTPCD

In order to explore the bending moment ratio of the flange and web of the friction bolted connection joint of the double-layer composite beam with type Ⅱ section,the bending moment distribution coefficient of the bolted connection joint of the composite beam with type Ⅱ section was studied through the analysis of the slip characteristics and mechanical transfer mechanism of the contact surface of the joint of the type Ⅱ section double-layer composite beam with three kinds of web bolt arrangement.The results show that the slip and mechanical force transfer process of the friction bolted connection joints of composite beams can be divided into three stages:incomplete slip and complete slip of the outer contact surface of the flange and complete slip of the inner contact surface of the flange.The sum of the bending moment of the contact surface of the friction bolted connection joint of the composite beam and that of the section without connecting plate is equal to the theoretical bending moment at the section of the beam,and the bending moment of the web contact surface is mainly borne by the horizontal friction force on it.The friction force on the contact surface of the friction bolted connection joint is redistributed with the slip of the joint,and the arrangement of the web bolts has a significant effect on the bending moment distribution coefficient of the joint.According to the derived calculation equation of bending moment distribution coefficient of friction bolted connection joints of composite beams,the results are in good agreement with the numerical simulation results with the maximum error of 7.13％,and the calculation can be used to optimize the design of bolted joints.