摘要
为了探究主塔结构形式对低重心斜拉桥纵向抗震性能的影响,本文以某双塔斜拉桥为依托工程,设计了3个比例为1/75的振动台试验模型。模型1与模型2均为固定铰接体系,但主塔结构形式不同;模型1与模型3的主塔结构形式相同,但采用不同纵向约束体系。选取3条实测地震波和一条场地人工波进行振动台试验,研究了不同主塔结构形式低重心斜拉桥的地震响应特性及破坏特征。台面输入峰值加速度0.7 g、0.8g和1.4g分别对应于模型1的1字形主塔底部开裂、模型2的人字形主塔下横梁开裂以及模型1和2中主塔严重损伤。模型1中主塔的下塔柱和下横梁均损伤严重,而模型2中主塔损伤仅在下横梁处。试验研究表明:人字形主塔在强震作用下的抗震性能及灾后可修复性优于1字形主塔;不同结构形式主塔在下横梁处均损伤严重,在工程设计中应予以重视。
In order to study the impact of different tower structures on the longitudinal seismic performance of low gravity center cable-stayed bridge,three 1/75 scale models were designed based on a cable-stayed bridge with twin concrete towers.Model 1 and Model 2 are both fixed-hinge systems but the main tower structure is different;Model 1 and Model 3 have the same main tower structure but adopt different longitudinal restraint systems.A shaking table test was conducted with three measured seismic waves and one site specific artificial wave,and the seismic response characteristics and failure mode of the different structures of the main tower with low gravity center cable-stayed bridge were studied.The input peak ground acceleration of 0.7 g,0.8 g,and 1.4 g correspond to bottom cracks of one-figure type main tower of Model 1,obvious cracks in the down crossbeam of herringbone type main tower of Model 2,and serious damage of main towers of Models 1 and 2,respectively.The lower tower columns and down crossbeam of the main tower of Model 1 were seriously damaged,but damage occurred only at down crossbeam of main tower for Model 2.The above test shows that compared with the one-figure type main tower,the seismic performance and post-disaster reparability of the herringbone type main tower is better;different forms of main towers are both seriously damaged at the down crossbeam which should be considered in engineering design.
作者
汪振
张文学
陈士通
方蓉
WANG Zhen;ZHANG Wenxue;CHEN Shitong;FANG Rong(College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China;Hebei Engineering Research Center for Traffic Emergency and Guarantee,Shijiazhuang TieDao University,Shijiazhuang 050043,China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2020年第3期370-376,共7页
Journal of Harbin Engineering University
基金
国家自然科学基金项目(51378034,51678376).
关键词
低重心斜拉桥
振动台试验
桥梁模型
地震响应
人字形主塔
1字形主塔
动力特性
损伤模式
low gravity center cable-stayed bridge
shaking table test
bridge model
seismic response
herringbone type main tower
one-figure type main tower
dynamic characteristic
damage pattern
