简支梁桥直接基于位移的减、隔震设计方法

Direct Displacement-based Design of Seismic Isolation of Simply-supported Beam Bridge of High-speed Railway

基于位移的设计方法被提出以来,已应用于多种不同结构的抗震设计中,包括安装各种减、隔震装置的结构.该方法的核心是在给定强度的地震作用下对主梁定义明确的目标设计位移,通过采用位移谱进行设计,使结构能够满足一定的性能水平,同时考虑了减、隔震装置的设计位移能力和桥墩的位移延性能力.高速铁路简支梁桥的一些自身特性也有利于应用直接基于位移的设计方法,论述了该方法的理论基础和设计流程,并将其应用于高速铁路典型简支梁桥的纵向减、隔震设计,采用非线性时程分析方法对该方法的计算结果进行了验证,结果表明,该方法对规则高速铁路简支梁桥有较好的适用性.

Displacement-based design （DBD） procedure has been applied to seismic design of vari-ous structures, includes many structures equipped with different seismic isolation systems. The key aspect of the proposed procedure is the definition of a uniform target displacement of the deck, which is assigned by the designer to accomplish a given performance level, expressed by lim-it values of the maximum isolation systems displacement and of the pier drift, respectively. The characteristics of simply-supported girder bridges of high-speed railway are beneficial to the appli-cation of the direct DBD method. In the paper, the background and implementation of the design procedure is presented first, then some validation studies by nonlinear time-history analysis on simply-supported girder bridges of high-speed railway are illustrated. The results show that DD- BD method is suitable for the seismic design of regular simply-supported girder bridges of high-speed railway.