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文章结合一座薄壁高墩刚构桥,采运用大型通用有限元软件ANSYS的空间梁单元BEAM189单元建立其空间动力分析模型,并选用El-Centro地震波对其进行空间地震时程分析,计算了该桥的横向和纵向的地震响应。由计算结果看出,跨中竖向位移在地震作用下的变位比较小,不控制设计;但是该桥墩顶位移在纵向地震波作用下比横向地震波作用下大很多;同时无论是在纵向还是横向地震力作用下,矮墩承受的地震力均要比高墩的大,应值得注意。分析结果对于评价该类桥梁的动力特性和抗震性能具有重要意义。
In this paper, a thin-walled high-pier rigid frame bridge is adopted. The spatial dynamic analysis model of the space beam element BEAM189 with large general finite element software ANSYS is adopted and analyzed by El-Centro seismic wave. The horizontal and vertical seismic responses of the bridge. According to the calculation results, the displacement of mid-span vertical displacement under earthquake is relatively small and does not control the design. However, the displacement of top of the piers is much larger under the action of longitudinal seismic waves than that of transverse seismic waves. Meanwhile, whether in vertical or horizontal Under the action of seismic force, the seismic force of the short pier should be greater than that of the high pier, which should be noticed. The results of the analysis are of great significance for evaluating the dynamic characteristics and seismic performance of such bridges.