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基于OpenSees软件及其纤维模型的有限元方法,建立了典型矮塔斜拉桥的非线性数值分析模型,分析各构件的抗震性能指标。采用动力增量分析法(即IDA方法),对结构进行了非线性动力时程分析,分别探讨了在纵桥向和横桥向地震作用下矮塔斜拉桥结构的构件破坏规律。分析了在不同加速度峰值情况下,矮塔斜拉桥主塔和边墩沿高度变化的应变包络图、主梁内力包络图及支座位移包络图。结果表明:与一般斜拉桥性能要求不同,矮塔斜拉桥的主塔可以发生损伤,塔底和边墩墩底为主要控制截面,支座在纵桥向地震组合作用下较易发生破坏,拉索和主梁是不易损伤的构件,主梁内力包络图的分布情况随着地震峰值的增加发生变化。
Based on the finite element method of OpenSees and its fiber model, a nonlinear numerical model of a typical short cable-stayed bridge is established, and the seismic performance of each component is analyzed. Dynamic incremental analysis (ie, IDA method) is used to analyze the nonlinear dynamic time history of the structure. The failure rules of the components of the low-rise cable-stayed bridge under longitudinal and transverse seismic loads are discussed respectively. In the case of different accelerations, the strain envelopes, the internal force envelopes and the displacement envelopes of the main towers and piers along the height of the davit tower are analyzed. The results show that, unlike the performance requirements of normal cable-stayed bridges, the main tower of the low-rise cable-stayed bridge can be damaged, and the bottom of the tower and side piers are the main control sections. The abutment is more prone to damage under the combination of the longitudinal bridge and the earthquake , The cable and the main girder are not easy to damage the components, the distribution of the main girder internal force envelope map changes with the increase of the earthquake peak.