不同挡块形式对中小跨径梁桥横向抗震性能的影响  

EFFECT OF DIFFERENT TYPES OF RETAINERS ON TRANSVERSE SEISMIC PERFORMANCE OF SMALL AND MID-SPAN GIRDER BRIDGES

作　　者：项乃亮[1] 李建中[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《工程力学》2016年第3期188-195,共8页Engineering Mechanics

基　　金：国家973项目(2013CB036302);国家自然科学基金项目(51278371);交通运输部建设科技项目(2013318800020)

摘　　要：针对我国汶川地震中小跨径梁桥的典型震害特征,提出一种新型摩擦型挡块代替常规混凝土挡块作为桥梁横向限位装置;然后以一座三跨连续梁桥为例,在考虑板式橡胶支座滑动、挡块非线性等力学因素的基础上,对分别采用常规混凝土挡块和摩擦型挡块时结构的横向地震反应特点进行了分析计算。结果表明,与常规混凝土挡块相比,摩擦型挡块通过自身的摩擦滞回耗能可以有效地降低结构的地震响应,大大改善结构的抗震性能。Following from the typical damage pattems of small and mid-span girder bridges in the Wenchuan earthquake, a new type of friction retainer is proposed to substitute for conventional concrete retainers as the transverse restraining device for bridges. Then a three-span continuous girder bridge is analyzed as an example. By considering laminated rubber bearings＇ sliding and retainers＇ nonlinear characteristics, the transverse seismic performance of the bridge is analyzed when conventional concrete retainers and friction retainers are applied separately. The analysis results indicate that, compared with conventional concrete retainers, friction retainers can effectively reduce the seismic response of the bridge through frictional energy dissipation and improve the bridge＇s seismic performance greatly.

关 键 词：中小跨径梁桥 板式橡胶支座滑动 常规混凝土挡块 摩擦型挡块 横向抗震性能 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]