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为了研究摩擦摆支座隔震曲线桥梁地震反应的空间耦合效应,分析了输入地震动维数对摩擦摆支座隔震曲线桥梁地震反应的影响。基于空间有限元方法,采用能考虑动轴力影响的多维耦合FPB恢复力模型,以一座2联6跨的预应力混凝土连续箱梁桥为例,输入3条强震记录,分别进行了一维、二维及三维地震动下的非线性时程反应分析及其对比分析。结果表明:输入地震动维数引起的耦合效应对隔震曲线桥梁的地震反应有重要影响;输入地震维数对支座的力-位移滞回曲线形状有较大影响;FPB隔震曲线桥的支座位移大小与输入地震动的维数有关。
In order to study the spatial coupling effect of the seismic response of the bridge with the seismically restraining curve on the friction pendulum, the influence of the input ground motion dimension on the seismic response of the seismically isolated bridge with the friction pendulum was analyzed. Based on the spatial finite element method, a multi-dimension coupled FPB restoring force model considering the influence of dynamic axial force is adopted. Taking a 2-for-6-span prestressed concrete continuous box girder bridge as an example, 3 strong earthquakes records are input and one-dimensional Nonlinear time history analysis and comparison analysis of 2D and 3D ground motions. The results show that the coupling effect caused by the input ground motion dimension has an important influence on the seismic response of the bridge with isolated curves. The input seismic dimension has a significant influence on the shape of the force-displacement hysteresis curve of the support; The displacement of bearing is related to the dimension of ground motions.