E2地震作用下减隔振桥梁的抗震设计

以某减隔振桥梁为例,建立该桥的三维有限元模型,考虑桩-土相互作用的影响,并根据混凝土和钢筋的材料特性,选取适宜的动力弹塑性本构模型,同时模拟了弹塑性减隔振球型钢支座,并采用人工拟合的3条地震动时程曲线对该桥进行了E2地震作用下的弹塑性时程分析,验算该桥在E2地震作用下的强度及变形。经过详细的验算与分析,验证了本桥设计的安全性和可靠性,并为实际工程中的非规则桥梁在E2地震作用下的抗震验算提供参考依据。

Seismic Design of Bridge with Vibration Isolation Device under the Action of E2 Earthquake Load

Taking a bridge with vibration isolation device as an example,the 3D finite element model which considered the influence of pile-soil interaction was established.And then according to the material characteristic of concrete and steel bar,the proper dynamic elastic-plastic constitutive models were selected and the elastic–plastic spherical steel bearings with the function of seismic isolation were also simulated.Furthermore,by using three artificial seismic time-history waves,the elastic-plastic time-history analysis on this bridge under the action of E2 earthquake load was carried out to calculate the strength and deformation of this bridge.The results of detailed calculation and analysis prove that the bridge in this paper is designed safely and reliably.Also,the design for this bridge provides a reference for irregular bridge's seismic analysis under the action of E2 earthquake load.