考虑碰撞效应的近断层区桥台-引桥-刚构连续梁桥结构体系减震措施研究  

Study on damping measures of abutment-approach bridge-rigid frame continuous girder bridge structural system considering collision effect near fault area

作　　者：魏俊杰 邬晓光[2] 卢伟 鄢稳定 胡科坚 WEI Junjie;WU Xiaoguang;LU Wei;YAN Wending;HU Kejian(School of Civil Engineering,Wuhan University,Wuhan 430072,China;School of Highway,Chang'an University,Xi'an 710054,China;China Design Group Co.Ltd.,Nanjing 210001,China)

机构地区：[1]武汉大学土木建筑工程学院,湖北武汉430072 [2]长安大学公路学院,陕西西安710054 [3]华设设计集团股份有限公司,江苏南京210001

出　　处：《中南大学学报（自然科学版）》2023年第1期238-248,共11页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51978062);山西省交通运输科技项目(2021-3-1)。

摘　　要：为了研究和探索合理的减震措施控制桥台-引桥-刚构连续梁桥结构体系的地震反应,以1座主跨径为120 m的刚构-连续组合梁桥为研究对象,采用CSIBridge建立考虑碰撞能量耗散、桩土相互作用、桥台与台后填土相互作用以及支座桥墩非线性行为的桥台-引桥-刚构连续梁桥结构体系弹塑性动力分析模型。在桥墩和桥台处共设置8种减震方案,分析普通地震波作用下不同方案的减震效果;然后,对比分析相同减震方案在近断层普通地震波和近断层长周期地震波作用下的地震反应。研究结果表明:各方案均能达到预期减震效果,其中采用双曲面球型减震支座(为单一减震装置)的方案减震效果最佳,而增加阻尼器的组合减震方案能进一步优化主桥墩受力。同时,只有在左右桥台处设置黏滞阻尼器的联合减震方案才能有效控制桥台处伸缩缝的碰撞效应。在近断层普通地震波作用下有效的减震方案在近断层脉冲型地震波作用下完全失效,但对减震装置进行参数优化后依然能达到预期减震效果。In order to study and explore reasonable damping measures to control the seismic response of abutmentapproach bridge-rigid frame continuous beam bridge structure system, a rigid-frame continuous composite girder bridge with main span of 120 m was taken as the research object, and the elastic-plastic dynamic analysis model of abutment-approach bridge-rigid frame continuous girder bridge structure system was established by using CSIBridge considering impact energy dissipation, pile-soil interaction, abutment-backfill interaction and nonlinear behavior of support piers. Eight kinds of shock absorption solutions were set up on the bridge pier and abutment,and damping effects of different schemes under the action of ordinary seismic wave were analyzed. Then, seismic responses of the same damping scheme under the action of near-fault common seismic wave and near-fault long period seismic wave was compared and analyzed. The results show that all the 8 schemes can achieve expected damping effects, in which the scheme that adopts single hyperboloid ball type has the best damping effect while the combination scheme of increasing damper numbers can further optimize bridge decks force. At the same time,the impact effect of expansion joints at abutments can be effectively controlled only by setting viscous dampers at the left and right abutments. The damping scheme which is effective under the action of common seismic wave near fault completely fails under the action of pulsed seismic wave near fault, but the desired damping effect can still be achieved after the parameter optimization of the damping device.

关 键 词：近断层地震波 减震措施 碰撞效应 地震响应 刚构-连续组合梁桥 桥梁结构体系 

分 类 号：U448.215[建筑科学—桥梁与隧道工程] U442.55[交通运输工程—道路与铁道工程]