铁路自复位桥墩地震动最不利输入方向研究  

Critical angle of earthquake input for self-centering bridge piers of railways

作　　者：祝浩然 夏修身[1] 钟亚伟[2] 戴胜勇[2] ZHU Haoran;XIA Xiushen;ZHONG Yawei;DAI Shengyong(Lanzhou Jiaotong University,Lanzhou 730070,Gansu,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,Sichuan,China)

机构地区：[1]兰州交通大学,甘肃兰州730070 [2]中铁二院工程集团有限责任公司,四川成都610031

出　　处：《地震工程学报》2024年第6期1380-1386,共7页China Earthquake Engineering Journal

基　　金：国家自然科学基金项目(52278186,52068041)。

摘　　要：为探究地震动输入角度对铁路自复位桥墩地震反应的影响,以一座简支梁桥为工程背景,建立空间自复位桥墩地震反应分析模型,并对模型进行验证。选择22组强震记录作为地震动输入,以屈服面函数Ψ作为判别最不利输入角度的标准,从0°开始顺时针旋转,每次增加5°,进行铁路自复位桥墩地震反应分析。结果表明:145°输入时,Ψ值最大,145°为桥墩最不利输入角度;在最不利方向下桥墩的地震反应大于顺桥向和横桥向。自复位桥墩设计时若不考虑地震动最不利输入方向,则偏于不安全。To investigate the influence of ground motion input angles on the seismic response of railway self-centering piers,a seismic response analysis model for spatial self-centering bridge piers was established and validated using a simply supported beam bridge as the case study.A total of 22 sets of strong motion records were selected as seismic inputs.The yield surface functionΨwas used to determine the critical input angle.Starting from an initial angle of 0°,the seismic response of the railway self-resetting pier was examined by rotating clockwise,increasing the angle by 5°increments each time.The results show that the value ofΨwas maximized at an input angle of 145°,designating this as the critical input angle for the pier.The seismic response in this critical direction surpassed those observed in the longitudinal and transverse directions.Designs that ignore the critical angle of ground motion in the design of self-centering bridge piers may be unsafe.

关 键 词：自复位桥墩 三维地震动 最不利角度 屈服面函数 

分 类 号：U442.59[建筑科学—桥梁与隧道工程]