碰撞效应对双层桥梁地震响应影响分析

• 作 者: 叶显亮
• 机 构: 贵州高速公路集团有限公司,
• 出 处: 公路
• 发表日期: 2016年07期
• 关键词: 双层桥梁 非线性时程分析 碰撞效应 碰撞问题 剪力 内力影响 间隙 墩底 地震作用 Hertzdamp模型

针对双层桥梁在地震作用下主梁与墩柱之间的碰撞问题,采用Hertzdamp模型模拟碰撞单元,建立了有限元分析模型。基于非线性时程分析法,对碰撞刚度、初始间隙进行了参数敏感性研究。结果表明:碰撞会增大墩柱的地震内力响应;横梁与墩柱之间的剪力显著增加;初始间隙在0~8cm内取值时,碰撞效应对墩柱的不利影响最大,超过8cm时,内力影响就很小了。

Aiming at the collision problem between main girder and pier under earthquake, the Hertzdamp model is used to simulate the collision unit and a finite element analysis model is established. Based on nonlinear time history analysis, the parameter sensitivity of crash stiffness and initial clearance was studied. The results show that: the collision will increase the seismic response of the pier; the shear force between the beam and the pier increases significantly; when the initial clearance is within 0 ~ 8cm, the adverse effect of the collision effect on the pier is greatest; when it exceeds 8cm , The impact of internal forces is very small.