高烈度地震区不等高墩桥梁延性抗震计算分析

Seismic Ductility Calculation of Bridge with Unequal Piers in Height in High Intensity Seismic Region

针对山区公路桥梁的典型特点,阐述了一座高烈度地震区不等高墩桥梁延性抗震设计的工程实例。通过引入弹塑性纤维梁柱单元,采用非线性动力时程法,重点分析了该桥在E2人工拟合地震波作用下的地震反应特性。计算结果表明,通过选用合理的结构体系,采用延性抗震设计方法能够实现此类桥梁大震不倒塌的设防目标。

According to the typical characteristics of highway bridge in mountainou area, an engineering example of seismic ductility design of bridge with unequal piers in height in high intensity seismic region was expounded. Under the action of E2 artificial fitting seismic waves, by introducing elastic-plastic fiber beam-column element, the seismic response characteristics of the bridge were analysed using nonlinear dynamic time history method. The results showed that this type of bridges could realize the anti-seismic fortification target of no collapse in the large earthquake by choosing reasonable structural system and using the seismic ductility design method.