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为了得到多柱墩盖梁在地震作用下的动力响应以及轴力对盖梁承载能力的影响,利用非线性有限元软件建立多柱墩混凝土梁桥的有限元模型,分析其盖梁在不同荷载工况下的轴力、剪力及弯矩分布,结果表明盖梁在横竖向地震作用下产生较大的轴向拉力与压力,将对盖梁的承载能力具有较大的影响,盖梁若按受弯构件设计是偏不安全的,应考虑轴向拉力对其承载能力的影响。
In order to obtain the dynamic response of multi-column pier under earthquake and the influence of axial force on the load-bearing capacity of the girder, the finite element method is used to establish the finite element model of multi-pier concrete bridge, Axial force, shear force and moment distribution under the working conditions. The results show that the large axial axial tension and pressure generated by the cover beam under the action of horizontal and vertical earthquakes will have a great influence on the bearing capacity of the cover beam. According to the design of flexural members is unsafe, we should consider the impact of axial tension on its carrying capacity.