防屈曲支撑对超高墩连续刚构桥横桥向地震响应的影响分析  

Analysis on the Impact of BRB on the Transverse Seismic Response of Ultra-High Pier Continuous Rigid Frame Bridge

作　　者：李善聚 郭志 陈彦江[2] LI Shan-ju;GUO Zhi;CHEN Yan-jiang(China Highway Engineering Consulting Corporation,Beijing 100089,China;The college of Architecture and civil engineening,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]中国公路工程咨询集团有限公司,北京市100089 [2]北京工业大学建筑工程学院,北京市100124

出　　处：《公路》2025年第3期456-462,共7页Highway

摘　　要：为研究使用防屈曲支撑(buckling restrained brace,BRB)替换横系梁对超高墩连续刚构桥横桥向地震响应的减震效果,基于OpenSees平台建立了某超高墩连续刚构桥非线性分析模型,探讨了BRB替换横系梁对具有不同墩高、跨径的超高墩连续刚构桥横桥向地震响应的影响规律。结果表明,采用BRB替代横系梁后,随结构跨径的增大,BRB对结构墩底弯矩的减震效果愈发显著;当墩高分别为100 m和130 m时,BRB的引入增加了结构墩底剪力的需求,但其减震效果随着跨径的增大愈发显著;当BRB数量增加时,结构的墩底弯矩均呈现下降趋势,而墩底剪力和轴力呈先减小后增大的趋势。To study the seismic mitigation effects of replacing transverse beams with buckling restrained braces(BRBs)on the transverse seismic response of ultra-high pier continuous rigid frame bridges,a nonlinear analysis model of a certain ultra-high pier continuous rigid frame bridge is established based on the OpenSees platform.The study explores the impact of BRB replacement of transverse beams on the transverse seismic response of ultra-high pier continuous rigid frame bridges with different pier heights and span lengths.The results show that:after replacing the transverse beams with BRBs,as the structural span length increases,the seismic mitigation effect of BRBs on the bending moment at the base of the piers becomes more significant.When the pier heights are 100 m and 130 m respectively,the introduction of BRBs increases the demand for shear force at the pier base of the structure,but its seismic mitigation effect becomes more significant as the span increases.As the number of BRBs increases,the pier base bending moment of the structure shows a downward trend,while the pier base shear force and axial force show a trend of first decreasing and then increasing.

关 键 词：桥梁工程 连续刚构桥 超高墩 防屈曲支撑(BRB) 地震响应 

分 类 号：U442.55[建筑科学—桥梁与隧道工程] U448.23[交通运输工程—道路与铁道工程]