墩底自复位减隔震连续梁桥地震碰撞响应研究  

Seismic impact response of continuous girder bridge with self-reset seismic reduction and isolation structure at pier bottom

作　　者：张文学[1,2] 张红 陈盈 方蓉[1,2] 赵汗青[1,2] ZHANG Wenxue;ZHANG Hong;CHEN Ying;FANG Rong;ZHAO Hanqing(College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China;MOE Key Lab of Urban Security and Disaster Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学建筑工程学院,北京100124 [2]北京工业大学城市与工程安全减灾省部共建教育部重点实验室,北京100124

出　　处：《振动与冲击》2020年第17期245-253,260,共10页Journal of Vibration and Shock

基　　金：国家自然科学基金(51778022);北京市自然科学基金(8172008)。

摘　　要：针对连续梁桥一般只设置一个固定墩,抗震设计难以满足实际需求。提出一种新型墩底自复位减隔震结构,通过振动台试验和有限元模拟研究墩底自复位减隔震结构的减震效果,并以典型铁路三跨连续梁桥为例,探讨墩底自复位减隔震结构对连续梁桥主桥与引桥之间的碰撞影响,分析场地类型、墩高以及地震加速度峰值等对碰撞响应的影响。结果表明:墩底自复位减隔震结构具有良好的减震效果,但有可能增大主桥与引桥之间的碰撞响应;场地类型和墩高对墩底自复位减隔震结构的减震效果影响较大,随着场地由I类场地向IV类场地变化和墩高的增加,墩底自复位减震结构的总体减震效果越明显。Aiming at problems of only one fixed pier usually being set for continuous girder bridges and aseismic design being difficult to meet actual demands,a new self-reset seismic reduction and isolation structure at pier bottom was proposed.The aseismic effect of the proposed structure at pier bottom was studied with shaking table tests and finite element(FE)simulation.Taking a typical 3-span railway continuous girder bridge as an example,effects of the proposed structure at pier bottom on impact between the main bridge and the approach bridge were studied to analyze effects of site type,pier height and peak seismic acceleration on impact response.Results showed that the proposed structure at pier bottom has good aseismic effect,but it may increase impact response between the main bridge and the approach one;site type and pier height greatly affect its aseismic effect,with site type varying from I to IV and increase in pier height,its overall aseismic effect is more obvious.

关 键 词：铁路 连续梁桥 自复位 减隔震 碰撞 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]