地震作用下墩底自复位减隔震高墩连续刚构桥碰撞响应  

Collision Response of High⁃pier Continuous Rigid Frame Bridges with Pier Bottom Self⁃centering Seismic Isolation Structure Under Earthquake Action

作　　者：罗震 代天宇 张文学[1] LUO Zhen;DAI Tianyu;ZHANG Wenxue(Faculty of Architecture,Civil and Transportation Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学城市建设学部,北京100124

出　　处：《铁道建筑》2024年第9期76-85,共10页Railway Engineering

基　　金：国家自然科学基金(51778022)。

摘　　要：以一座铁路高墩大跨度连续刚构桥梁为研究对象,基于椭圆形墩底自复位减隔震桥墩试验,建立多尺度有限元模型,考虑主桥和引桥碰撞响应,研究高墩连续刚构减隔震体系的地震响应规律。根据数值仿真分析结果,分别研究考虑碰撞的高墩连续刚构体系采用墩底减隔震前后、高墩连续刚构减隔震体系考虑碰撞前后体系中刚构墩和交界墩的地震响应规律。结果表明:采用减隔震措施能够有效减小考虑引桥的高墩连续刚构体系中刚构墩与交界墩的地震响应;考虑碰撞会明显降低高墩连续刚构减隔震体系中交界墩的墩底剪力与弯矩,但对刚构墩的地震响应影响并不明显。基于考虑碰撞的高墩连续刚构减隔震体系模型,参数化分析了墩高、伸缩缝间距、主引桥周期比对碰撞行为、主桥刚构墩地震响应、引桥交界墩地震响应等的影响,并给出各参数的合理取值与设计建议。This Taking a high-pier long span continuous rigid frame railway bridge as the research object,based on the bottom of the oval pier with self-centering seismic isolation structure test,a multiscale finite element model was established to investigate the seismic response characteristics of the high-pier continuous rigid frame isolation system,considering the collision response of the main bridge and the approach bridge.According to the results of numerical simulation analysis,the seismic response characteristics of the rigid frame piers and the interface piers in the high-pier continuous rigid frame system with and without seismic isolation at the bottom of the piers,and the seismic response characteristics of the interface piers before and after considering the collision,were studied separately.The results indicated that the adopting of isolation measures can effectively reduce the seismic response of the rigid frame piers and interface piers in the high-pier continuous rigid frame system considering the collision.Considering the collision significantly reduced the bottom shear and bending moment of the interface piers in the high-pier continuous rigid frame isolation system,but the impact on the seismic response of the rigid frame piers is not significant.Based on the model of the high-pier continuous rigid frame isolation system considering the collision,parameterized analysis was conducted on the effects of pier height,expansion joint gap,the period ratio of main bridge and approach bridge on the collision behavior,seismic response of main bridge piers,and seismic response of interface bridge piers.The reasonable values and design recommendations for each parameter were provided.

关 键 词：铁路桥梁 主引桥碰撞 数值仿真 高墩连续刚构桥 墩底减隔震 

分 类 号：U448.23[建筑科学—桥梁与隧道工程]