桥墩刚度对桥梁地震响应的影响分析

通过midas有限元分析软件建立桥梁地震响应模型,系统研究桥墩直径、高度和配筋率等桥墩刚度控制因素对桥梁地震响应的影响。结果表明,增大桥墩直径可降低墩顶位移和提高桥墩承载能力,但同时会造成墩底内力增大。桥墩高度在某一临界值范围内时,墩顶顺桥向位移主要受桥墩自身刚度控制;超过这一临界值时,则变为主要受主梁和支座的约束作用。提高桥墩纵向钢筋配筋率可有效提高桥墩抗震承载能力,同时对桥墩内力影响较小,可提高桥墩抗震工作性能。

Analysis of the Effect of Pier Stiffness on Seismic Response of Bridge

The seismic response model is established by Midas finite element analysis software to study the effects of pier stiffness such as the diameter,height and reinforcement ratio of the pier on bridge seismic response.Increasing the diameter of the pier can reduce the displacement and improve the bearing capacity of the pier.Meanwhile,it will increase the internal forces of the pier.When the pier height is within a certain critical value,the pier displacement is mainly controlled by the pier stiffness;when the pier height exceeds this critical value,it turns to be mainly restrained by the substructure and supports.Improving the reinforcement ratio of the pier can effectively improve the seismic capacity of the pier.