地震工程学报2017，Vol.39Issue(6)：1005-1010,6.DOI:10.3969/j.issn.1000-0844.2017.06.1005
高烈度区大跨刚构-连续梁桥地震响应分析
Seismic Response Analysis of Long-span Rigid Frame-continuous Girder Bridges in High Intensity Region
摘要
Abstract
Considering the geological structure activity in the Wenchuan earthquake fault zone, the seismic performance of bridges in the area must be considered in design.As is a typical case of a long-span rigid frame-continuous girder bridge in a mountain area,the Yangjigou left line bridge was selected in this study in order to investigate the seismic response of this kind of bridge in the high intensity region.Multiple finite element models were developed with Midas software, and the horizontal seismic waves in the longitudinal and transverse directions of the bridge were considered.By comparing the results of the response spectrum and time-history analysis,the dy-namic response characteristics of the bridge structure were obtained,which can provide a refer-ence basis for the design of long-span rigid frame-continuous girder bridges.The analysis results reveal that the response spectrum method should not be adopted in order to analyze the rigid frame-continuous system,when it is a single-pier rigid frame.When carrying out a time-history analysis on the seismic performance of bridges in the high intensity region,we do not only have to adopt suitable seismic waves,but also have to select artificial waves converted from local seismic parameters as the seismic excitation source.Due to construction restrictions in mountainous areas,bridge piers may have unequal heights.The internal force concentration caused by the great stiffness of the short pier can be avoided by changing the cross-section shape of the pier,and the connection mode between the girder and pier,in order to adjust the internal force distribution.关键词
刚构-连续梁/高烈度地区/地震响应/时程分析/反应谱Key words
rigid frame-continuous girder/high intensity region/seismic response/time history analysis/response spectrum分类
建筑与水利引用本文复制引用
魏鑫,卫星,李明清..高烈度区大跨刚构-连续梁桥地震响应分析[J].地震工程学报,2017,39(6):1005-1010,6.基金项目
铁道部科技研究开发计划(Z2012-061) （Z2012-061）
