基于大质量法的高墩大跨连续刚构桥地震时程反应分析

运用大质量法,推导了长大跨度桥梁考虑多点激励和行波效应的分析模型及解析方程。结合109国道小沙湾黄河特大桥的工程实例,对该桥地震动一致激励和考虑行波效应激励下高墩的地震时程反应作了对比分析研究。分析结果表明:行波效应对3个主墩的轴力和面内弯矩都有不同程度的削弱。其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。

Analysis of Seismic Time-History Response of High-Rise Pier and Long Span Continuous Rigid-Frame Bridge Based on Great Mass Method

The great mass method is used to derive the analysis model and equations for high-rise pier and long span bridge,in which the multi-support excitation and traveling wave effect in the seismic events are considered.By way of example of Xiaoshawan Huanghe River Bridge on the National Road 109,the comparative analysis and study are made for the seismic time-history response of the high-riser piers of the Bridge affected by the excitation identical to the seismic events at the Bridge site and excitation of the traveling wave effect thereof.The results of the analysis show that the axial forces and in-plane moment of the three main piers of the Bridge are decreased at various degrees due to the traveling wave effect.The analysis method and results in the paper are of certain reference to the design and research of similar bridges.