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本文将桥墩作为“整体”中的“局部”加以考察,研究重力式桥墩的动力特性和地震响应。在总结国内外一些成果的基础上,对一座半径600米曲线上多跨简支梁桥建立全桥空间计算简图,以有限单元法,应用SAP 5程序求出频率、振型、以及按ELCENTRO加速度谱进行响应谱分析。研究了曲线半径、基底地基弹性、以及梁的支座条件等对桥梁自振特性和地震谱响应的影响。认识到:从整体上说,全桥纵、横、竖三个方向振动的独立性是相当强的;从个体上说,各墩和各梁都有自己的卓越频率。全桥
In this paper, the pier as a “whole” in the “local” to examine the dynamic characteristics of the bridge pier and earthquake response. On the basis of summarizing some achievements both at home and abroad, a full-bridge spatial calculation diagram is established for a multi-span simply supported girder bridge with a radius of 600 meters. The finite element method is used to calculate the frequency and mode shape with SAP 5 program. Acceleration spectrum response spectrum analysis. The influence of curve radius, basement elasticity and bearing conditions of the girder on the natural vibration response and seismic response of the bridge are studied. It is recognized that on the whole, the independence of the vibration of the vertical, horizontal and vertical directions of the bridge is quite strong. From the individual point of view, the piers and beams have their own excellent frequency. Full bridge