地震作用下多孔钢波纹板拱桥力学分析

摘要

To investigate the seismic performance of arch bridges with porous corrugated steel plate ,the engineering practice of a corrugated steel plate arch bridge with three 4 m-long spans on the Sihong-Xuchang Expressway is cited as an example.The finite element software ANSYS was used to establish the solid spatial finite element model of the bridge ,using the dynamic time-histo-ry response analysis method to analyze the displacement and stress of the structure under actions of the synthetic seismic wave ,E1 Centro wave and Taft wave.The results of the analysis indicate that under the same seismic time-history excitation ,despite that the spatial positions of the arch ribs are different ,the trends of the time-history curves of displacement and stress response are in accord.In the same arch rib ,the arch crow n displacement and stress in the arch curve are respec-tively 24.9% and 75.2% less than those in the four-dividing point.The central displacement and stress along the transverse bridge direction in different arch curves are respectively 7.3% and 17. 6% greater than those in the outer sides.At the same point ,the displacement and stress in the side span arch ribs are respectively 2.5% and 20% greater than those in the central span arch rib. The arch bridge is proved to have sound integrated seismic performance.%为给多孔钢波纹板拱桥的抗震设计提供参考 ,结合泗洪至许昌高速公路上一座3孔跨径4m的钢波纹板拱桥工程实例 ,利用大型通用有限元软件ANSYS建立该桥的三维空间有限元实体模型 ,采用动态时程分析法 ,对桥梁在人工合成地震波、El Centro波、Taft波3种地震波作用下结构的位移和应力进行分析.结果表明 :在同一地震时程激励下 ,虽然各拱圈空间位置不同 ,但位移和应力响应的时程曲线走向一致 ;同一拱圈中 ,拱弧线拱顶位移比四等分点处位移约小24 .9% ,应力约小75 .2% ;不同拱弧线横桥向中部位移比外侧位移约大7 .3% ,应力约大17 .6% ;同一位置处边跨拱圈比中跨拱圈位移约大2 .5% ,应力约大20% .该拱桥结构具有良好的整体抗震性能.