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为了探究钢桁架拱桥在E1和E2地震作用下的抗震性能,本文采用有限元软件abaqus6.10对某上承式钢桁架拱桥进行E1地震作用下和E2地震作用下的非线性动力时程分析。通过对拱肋的轴力包络图、弯矩包络图以及关键部位的轴力进行分析,发现该拱桥在纵桥向地震激励下的结构响应小于横桥向地震激励下的结构响应;在E2地震作用下,该拱桥偏于不安全,建议采用阻尼器、耗能支撑等构件对其抗震性能进行改善。
In order to investigate the seismic performance of steel truss arch bridge under the action of E1 and E2 earthquakes, this paper uses finite element software abaqus6.10 to analyze nonlinear dynamic time-history of a steel truss arch bridge subjected to E1 earthquake and E2 earthquake. By analyzing the axial force envelope, the moment envelope and the axial force of the key part, the structural response of the arch bridge under longitudinal seismic excitation is found to be less than that under transverse seismic excitation. In Under the action of E2 earthquake, the arch bridge is unsafe. It is suggested that dampers and energy dissipation support be used to improve its seismic performance.