%0 Journal Article
%T 高烈度区大跨刚构-连续梁桥地震响应分析<br>Seismic Response Analysis of Long-span Rigid Frame-continuousGirder Bridges in High Intensity Region
%A 魏鑫
%A 卫星
%A 李明清
%J 地震工程学报
%D 2017
%R 10.3969/j.issn.1000-0844.2017.06.1005
%X 为研究大跨刚构-连续梁桥在高烈度地区的地震响应，选取羊记沟左线大桥为工程背景，利用Midas软件建立多个有限元模型，考虑纵、横桥向的水平地震波输入，比较反应谱与时程分析结果，获得结构动力响应特点，为大跨刚构-连续梁桥的抗震设计提供参考依据。结果表明：刚构-连续体系仅单墩刚构时不宜采用反应谱分析，高烈度地区桥梁进行地震响应时程分析时，选用与场地适应的地震波的同时，应考虑采用本地地震参数转化人工波作为地震激励源。桥墩不等高时，可通过改变墩截面形状及其与主梁连接方式调节内力分布，避免矮墩刚度大导致的内力集中。<br>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 dynamic response characteristics of the bridge structure were obtained, which can provide a reference 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.
%K 刚构-连续梁
%K 高烈度地区
%K 地震响应
%K 时程分析
%K 反应谱&lt
%K br&gt
%K rigid frame-continuous girder
%K high intensity region
%K seismic response
%K time history analysis
%K response spectrum
%U http://dzgcxb.ijournals.cn/ch/reader/view_abstract.aspx?file_no=20170603&flag=1