薄壁高墩大跨连续刚构桥地震时程反应参数研究

运用大质量法,建立并推导了长大跨度桥梁考虑行波效应的分析模型及解析方程。以内蒙古小沙湾黄河特大桥为工程背景,选取墩身刚度、地震波视波波速、地震波激励方向等主要参数,建立动力计算模型,对该桥上述各种参数工况下地震时程反应作了参数对比分析研究。利用分析结果,探讨了同类桥梁在各种参数变化情况下墩顶位移和墩底内力的变化规律。

Parametric Study of Seismic Time-history Response of High-rise Thin-wall Pier and Long Span Rigid Frame Bridges

The model and equations used for measuring the seismic effects of traveling wave onto long span bridges are derived and established,during the course of which the large mass method is utilized.Taking Xiaoshawan Yellow River Bridge in Inner Mongolia as an example,considering pier shaft stiffness,earthquake wave speed,earthquake wave excitation direction such main parameters,the analytical comparison of the bridge's responses to those parameters is carried out through the dynamical model set up.Using the analytical result,discusses the changing disciplinarian of the displacements on top-pier and the forces of pier on the same kind of bridge under the condition of various parameters are changed.The approach and achievement represented in this paper have some certain significance as a reference for the Earthquake-Resistant design and research of other similar bridges.