行波效应对铁路大跨连续刚构桥地震反应的影响

The Excitation Effect of Traveling Waves on Seismic Response of Railway Long-span Continuous Rigid-frame Bridge

摘要:

介绍了模拟地震地面运动的大质量法,推导了大跨度桥梁考虑行波效应的分析模型及解析方法。以大准黄河特大桥为工程背景,选取墩身刚度、地震波视波波速及不同的地震记录为主要参数,进行了考虑行波效应下铁路大跨连续刚构桥的时程反应分析,并与一致激励下的结果进行了对比。系统总结了此类桥梁在行波效应激励下的地震反应特点。本文分析方法和结果对同类桥梁的设计与研究具有一定的参考价值。

Abstract:

The large mass method for simulating ground motion is introduced, the model and equations used for considering the seismic effects of traveling wave on long-span bridge are derived. Taking Dazhun great bridge on Yellow river as an example, considering such main parameters as pier shaft stiffness, earthquake wave speed and different ground acceleration time-history, the seismic response of railway long-span continuous rigid-frame bridge under excitation of traveling waves is analyzed, and the compara- tive analysis of the results with uniform excitation are made also. The characteristics of seismic response on the bridge are systematically summarized. The analysis method and results in the paper are of certain reference to the design and research of similar bridges.