桥梁结构地震碰撞分析模型的碰撞刚度计算方法研究  

Computation methods for impact stiffness of earthquake-induced bridge pounding models

作　　者：许祥[1] 鞠三 刘伟庆[1] 徐秀丽[1] 李雪红[1] 李枝军[1] 

机构地区：[1]南京工业大学土木工程学院,南京211816 [2]中交第二公路勘察设计院有限公司,武汉430056

出　　处：《振动与冲击》2013年第12期31-39,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金项目资助(51178220);江苏省"六大人才高峰"项目资助

摘　　要：针对桥梁结构地震碰撞模拟问题,文中分别推导了基于波动理论的直杆共轴碰撞模型和基于接触单元法的刚体碰撞模型中相应的最大碰撞变形的计算式,并基于二者相等的关系给出了Kelvin模型和Hertz-damp模型中相应碰撞刚度的计算方法,并对所建议方法的合理性和精确度进行了验证分析。研究结果表明,文中建立方法计算的Kelvin模型的碰撞刚度数值明显小于较短主梁的轴向刚度,这一点与以前学者基于实测数据分析得到的结论相一致。数值分析结果表明,相比以前的碰撞刚度计算方法,采用本文建议的方法确定Hertz-damp模型的碰撞刚度时,可以显著提升其碰撞模拟精确度。In order to study the earthquake-induced bridge pounding, the computation methods of impact stiffness for Kelvin model and Hertz-damp model were theoretically derived based on equating the maximum pounding deformation calculated with the collinear impact model of two rods to that calculated with the rigid-body impact model. Then, the effectiveness of the proposed calculation methods was verified, respectively. The results indicated that the impact stiffness of Kelvin model is obviously smaller than the axial stiffness of the shorter bridge girder, this fact supports previous researchers＇ comments obtained from the measured data. The numerical analysis results indicated that Hertz-damp model can raise the pounding simulation accuracy with the proposed impact stiffness calculation method.

关 键 词：桥梁 碰撞 KELVIN模型 Hertz-damp模型 直杆共轴碰撞模型 刚体碰撞模型 碰撞刚度 

分 类 号：TU311.3[建筑科学—结构工程] U442.55[建筑科学—桥梁与隧道工程]