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为分析可液化河谷场地简支梁的地震反应,首先基于OpenSees,采用二维场地-结构整体化模拟方法对某离心机试验进行了数值模拟,并验证模拟方法的可靠性;然后建立了一座典型河谷场地-三跨简支梁桥的有限元模型,分析场地液化与否对场地及简支梁桥各部件地震反应的影响。结果表明:与输入地震的加速度谱相比,液化场地可延长地表土体加速度反应的卓越周期;与场地未液化相比,场地液化可导致地面大变形,桩基础在桩顶和土层分界处的弯矩、桥墩倾斜程度、滑动支座位移均有所增加,但场地液化与否对墩底弯矩的影响很小。
In order to analyze the seismic response of simply supported beams in liquefiable valley sites, a centrifuge test was first conducted based on OpenSees and a two-dimensional site-structure simulation method was used to simulate and verify the reliability of the simulation method. Then a typical River valley site - finite element model of three-span simply supported girder bridge to analyze the influence of site liquefaction on the seismic responses of the site and the components of simply supported girder bridge. The results show that liquefied sites can prolong the remarkable period of acceleration response of surface soil compared with the acceleration spectrum of input earthquakes. Compared with non-liquefied sites, liquefaction of site can lead to large deformation of the ground, The bending moment, the inclination of bridge piers and the displacement of sliding bearings all increased, but the liquefaction of the site had little effect on the moment of pier bottom.