桥梁高墩位移延性能力的探讨  

Investigation for displacement ductility capacity of tall piers

作　　者：李建中[1] 宋晓东[1] 范立础[1] 

机构地区：[1]同济大学桥梁工程系,上海200092

出　　处：《地震工程与工程振动》2005年第1期43-48,共6页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(50278068)

摘　　要：本文运用增量动力分析方法来计算高墩的屈服位移、极限位移和位移延性,给出了应用IDA方法计算屈服位移、极限位移的主要过程,探讨了高阶振型对高墩位移延性能力的影响。通过算例分析表明:现行计算桥墩位移延性系数的方法,如直接应用到高墩,将会导致较大误差;高阶振型对高墩的屈服位移、极限位移和位移延性系数都有较大的影响。The incremental dynamic analysis (IDA) is used to determine yield, ultimate displacements and the displacement ductility for a tall pier. The main procedures using IDA for determination of yield displacement and ultimate displacement are given. The influence of higher modes on the yield displacement, ultimate displacement and the displacement ductility for a tall pier is investigated. The results show that the contribution of higher vibration modes to response has a significant effect on the yield, ultimate displacement and displacement ductility capacity for a tall pier. The maximum displacement at the top of the pier does not correspond to the maximum curvature at bottom section of the pier for a tall pier due to the effect of higher modes. Use of the conventional static method to (evaluate) the displacement ductility capacity of tall piers will result in a large error.

关 键 词：位移延性 屈服 限位 高墩 振型 动力分析 计算 梁高 桥梁 桥墩 

分 类 号：P315.72[天文地球—地震学] TU375.3[天文地球—固体地球物理学]