可控转角摩擦型铰节点滞回耗能研究

Study on hysteretic energy consumption of controllable⁃angle fiction hinge joint

提出一种可控转角摩擦型铰节点,介绍了该节点的构造。利用既有试验对有限元软件ABAQUS模型材料参数进行验证,结果表明,试验结果与数值模拟结果吻合较好。建立25个不同参数的节点模型,探究螺栓预紧力、拼板间摩擦系数、梁固定端距销轴轴心距离、梁连接端肋板厚度、梁连接端肋板外伸长度、节点处肋板厚度、节点处肋板外伸长度共7个变化参数对节点滞回耗能的影响。通过拟合获得的数据,建立了节点摩擦反力提高系数与摩擦系数、节点安全储备系数与摩擦系数的关系曲线。结果表明:当节点转角大于设定转角后,节点产生的限位接触使节点反力大幅增加,实现限制节点转角的目的;摩擦系数在0.35左右耗能最大;在节点转角小于设定转角时,滑动摩擦反力与螺栓预紧力的比值约等于摩擦系数;节点最终破坏的总耗能随螺栓预紧力的增加而增大;螺栓预紧力超过规范规定的设计值时,对节点的累积耗能提高程度不明显;梁固定端距销轴轴心距离在梁高的0.95至2倍时耗能最佳;梁固定端距销轴轴心距离过大时,将降低节点的极限反力;梁连接端肋板厚度、梁连接端肋板外伸长度、节点处肋板厚度和节点处肋板外伸长度对节点滞回性能影响不显著。

A controllable-angle fiction hinge joint was proposed,and the construction of the joint was introduced.The material parameters of the finite element software ABAQUS model was verified by using existing experiments,and the results indicate that the experimental results are in good agreement with the numerical simulation results.Twenty-five joint models with different parameters were established to explore the influence of the 7 change parameters on the hysteretic energy consumption of joints.The parameters are bolt preload,friction coefficient between plates,the distance between the fixed end of the beam and the axis of the pin shaft,the thickness of beam connection end rib plate,the rib extension length of beam connection end,the thickness of rib plate at joint and the extended length of the rib at the joint.By fitting the obtained data,the relationship curves between the improvement coefficient of friction reaction and friction coefficient,as well as the safety reserve coefficient and friction coefficient of joints were established.The results show that the generated limit contact greatly increases the joint reaction force and achieves the purpose of limiting the joint rotation angle when the joint rotation angle is larger than the set rotation angle.The energy consumption is the largest when the friction coefficient is around 035.The ratio of the sliding friction reaction force to the bolt preload is approximately equal to the friction coefficient when the joint rotation angle is less than the set rotation angle.The total energy dissipation of the final failure of the joint increases with the increase of the bolt preload.The cumulative energy consumption of the joint is not significantly improved when the bolt preload exceeds the design value.The energy consumption is the best when the distance between the fixed end of the beam and the axis of the pin shaft is 095 to 2 times the height of the beam.The ultimate reaction force of the joint will be reduced when the distance between the fixed end of the beam and the axis of the pin shaft is too large.The thickness of beam connection end rib plate,the rib extension length of beam connection end,the thickness of rib plate at joint and the extended length of the rib at the joint have no significant effect on joint hysteresis performance.