高架桥模型考虑行波效应下的动力反应研究
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摘要
城市高架桥的主要型式是连续桥梁,多跨连续梁桥由于延伸长,跨数多,在研究其抗震性能时,需要考虑多点激励下结构的动力反应,因此高架连续梁桥成为典型的研究对象,行波效应是多点地震地面运动分析方法中最常用的一种方法,因此被地震分析中普遍应用。将几何比例为1:10的连续梁桥缩尺模型为研究对象,完成了纵向一致地震动输入和行波输入下数值模拟得到结构动力反应分析的对比。结果表明:考虑行波效应会对一端滑动支座相对位移产生影响,因此考虑行波效应研究高架桥地震反应是极其重要的。
The main type of urban viaduct is the continuous beam bridge. The multi-span continuous beam bridge is required to consider the dynamic response of structure under the multi-point excitation in the study of its seismic performance because of its long extension and many spans. Therefore, the elevated continuous bridge becomes the typical study object. The traveling wave effect is one of the most common methods in the multi-point earthquake ground movement analysis method. Therefore, it is generally used in the earthquake analysis. The article compares and analyzes the dynamic response of structure numerically simulated by the longitudinal unanimous earthquake import and traveling wave import according to the study object of geometric proportion 1:10 continuous beam bridge scale model. The result shows that the traveling wave effect will influence the displacement at an end of sliding support. Therefore, it is very important to consider the traveling wave effect for the study of earthquake response of viaduct.
The main type of urban viaduct is the continuous beam bridge. The multi-span continuous beam bridge is required to consider the dynamic response of structure under the multi-point excitation in the study of its seismic performance because of its long extension and many spans. Therefore, the elevated continuous bridge becomes the typical study object. The traveling wave effect is one of the most common methods in the multi-point earthquake ground movement analysis method. Therefore, it is generally used in the earthquake analysis. The article compares and analyzes the dynamic response of structure numerically simulated by the longitudinal unanimous earthquake import and traveling wave import according to the study object of geometric proportion 1:10 continuous beam bridge scale model. The result shows that the traveling wave effect will influence the displacement at an end of sliding support. Therefore, it is very important to consider the traveling wave effect for the study of earthquake response of viaduct.
引文
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[2]Kiureghian A D,Neuenhofer A.Response spectrum method for multi-support seismic excitations[J].EESD,1992(21):713-740.
[3]Kiureghian A D,Neuenhofer A.A coherency model for spatially varying ground motions[J].EESD,1996(25):99-111.
[4]袁万城.大跨桥梁空间非线性地震反应分析[D].上海:同济大学,1990.
[5]DUMANOGLU A A,BROWNJOHN J M W,SEVERN R T.Seismic analysis of the Fatih sultan Mehmet(second Bosporus)suspension bridge[J].Earthquake Engineering and Structral Dynamics,1992,21(11):881-906.
[6]苗家武,胡世德,范立础.大型桥梁多点激励效应的研究现状与发展[J].同济大学学报,1999,27(2):189-192.
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