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在连续梁桥活动墩上设置限位装置后,活动墩处将包含活动支座的摩擦及限位装置的接触碰撞两种非线性,综合摩擦单元及接触单元的特性,分别考虑接触单元的弹性及弹塑性情况,提出了接触摩擦单元的有限元模型,给出了接触摩擦单元的滞回曲线,针对卸载曲线的不同状态,分别推导出了其卸载刚度;利用接触摩擦单元对设置有分散抗震挡块及活动摩擦支座的连续梁桥进行了非线性地震反应分析,对挡块在降低连续梁桥固定墩地震反应上的分散抗震作用进行了研究,该接触摩擦单元可用于设置有防落梁装置及活动支座桥梁的较为细致的抗震分析模型。
After setting the limit device on the movable beam of the continuous beam bridge, the movable pier will contain the characteristics of the friction of the movable support and the contact and impact of the limit device, the characteristics of the integrated friction unit and the contact unit, respectively, taking into account the elasticity of the contact unit And the elasto-plastic condition, a finite element model of the contact friction element is proposed, and the hysteresis curve of the contact friction element is given. According to the different states of the unloading curve, the unloading stiffness of the contact element is deduced. Using the contact friction element, The nonlinear seismic response analysis of the continuous girder bridge with the block and the movable friction bearing is carried out and the anti-seismic action of the block on reducing the seismic response of the fixed bridge with continuous girder bridge is studied. The contact friction unit can be used to set the anti- Beam device and movable support bridge more detailed seismic analysis model.