钢-混凝土组合螺栓连接件极限强度及剪力-位移关系

Ultimate strength and load-deformation relationship of steel-concrete composite bolted connector

对11个装配式剪力墙的钢-混凝土组合螺栓(SCCB)连接件进行单调拉伸试验,借鉴传统螺栓连接件的计算方法并考虑盖板翘曲影响,推导出SCCB连接件的极限强度计算方法.将SCCB连接件剪力-位移曲线分为弹性阶段、滑移阶段和滑移后阶段;考虑SCCB连接件栓杆较长、混凝土受芯板约束的特点,对2种已有螺栓连接件剪力-位移关系经验模型进行修正并应用于滑移后阶段.结果表明:试验中存在孔壁挤压和栓杆剪断2种破坏模式,多数试件在破坏过程中伴随盖板翘曲现象;极限强度计算值与试验值吻合较好,试验值与计算值比值的均值和变异系数分别为1.03和0.089;修正Rex模型和修正Liu模型均可较好地反映连接件在单调拉伸荷载作用下发生孔壁挤压破坏时的剪力-位移关系.

11 steel-concrete composite bolted(SCCB) connectors were tested by using monotonic tensile loading. Based on the calculation method of conventional bolted connection, the calculation method for the ultimate strength of SCCB connectors was proposed considering the influence of curling. The load-deformation relationship of the SCCB connector was divided into the elasticity stage, the slippage stage and the post-slippage stage. Considering the long bolt shank and confinement of the inner plate in the SCCB connector, two empirical models were modified to depict the post-slippage stage. The results show that two failure modes, bearing failure and bolt shear failure, are observed, and most of the connectors fail along with curling. The calculated data of the ultimate strength agree with the experimental data. The mean value and the coefficient of variation of the ratio of the experimental results to the calculated results are 1.03 and 0.089, respectively. The modified Rex model and the modified Liu model can describe the load-deformation relationship of the SCCB connector suffered bearing failure under monotonic loading.