摘要
预制节段拼装桥梁作为一种预制结构形式,具有缩短施工时间,减少交通延误,提高施工质量控制,并将对环境的影响降到最低等优点。目前对该类桥墩拟静力作用下的抗震性能进行了研究,而有关该类桥墩或桥梁结构在预期强震作用下或深水条件下受力性能的研究很少。为此,提出一种设置外部耗能钢筋的节段拼装自复位钢管混凝土(PSCFST)桥墩,并对一座采用PSCFST桥墩的四分之一缩尺单跨桥开展了水下振动台试验,研究不同水深条件下动水压力对PSCFST桥梁抗震性能的影响。桥梁承受不同峰值水平单向地震动,考虑无水、水深1.2、1.5 m和1.8 m四种工况。试验研究表明:PSCFST桥具有良好的抗震性能,上部结构与下部结构均无明显损伤;随着水深的增大,PSCFST桥的阻尼比增大,自振周期减小,上部结构加速度响应减小,位移响应变化不明显。
As a form of prefabricated structure,prefabricated segmental bridges can shorten construction time,reduce traffic delays,improve construction quality control,and minimize the impact on the environment.At present,certain studies have been conducted on the seismic performance of such bridge piers under pseudo-static forces,but there are few studies on the mechanical performance of such piers or bridge structures under anticipated strong earthquakes or under deep water conditions.A segmentally-assembled self-centering concrete-filled steel tubular(PSCFST)bridge pier with external energy-dissipation steel bars was proposed,and underwater shaking table tests on a quarter-scale single-span bridge using PSCFST piers were carried out.The impact of hydrodynamic pressure on the seismic performance of PSCFST bridges was studied.The bridge was subjected to unidirectional ground motions at different peak levels.Considering the working conditions of four water depths(i.e.,no water,1.2 m,1.5 m and 1.8 m),the superstructure response of the PSCFST bridge specimen under different water depths was compared.The experimental research shows that the PSCFST bridge has good seismic performance,there is no obvious damage to superstructure and substructure.As the water depth increases,the damping ratio of the PSCFST bridge increases,the natural vibration period decreases,the acceleration response of the superstructure decreases,and the displacement response does not change significantly.
作者
张丹
李宁
ZHANG Dan;LI Ning(School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China;School of Civil Engineering,Tianjin University,Tianjin 300350,China;Key Laboratory of Coast Civil Structure Safety,Ministry of Education,Tianjin University,Tianjin 300350,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2021年第S02期382-390,共9页
Journal of Building Structures
基金
国家重点研发计划(2018YFC1504306)
国家自然科学基金项目(51678407)
关键词
预制拼装
自复位
钢管混凝土
振动台试验
抗震性能
prefabricated assembly
self-centering
concrete-filled steel tube
shaking table test
seismic performance
作者简介
张丹,出生于1990年,女,工学博士,讲师,主要从事预制拼装组合结构力学性能研究。email:zd951767323@tju.edu.cn;通信作者:李宁,出生于1981年,男,工学博士,教授,主要从事工程抗震减振控制方面的研究。email:neallee@tju.edu.cn
