自复位榫卯式节段拼装桥墩抗震性能分析  

An Analysis on Seismic Performance of Self-centering Mortise-tenon Segmental Piers

作　　者：郝常顺 倪永军[1] 康召才 徐岩州 马俊杰 HAO Chang-shun;NI Yong-jun;KANG Zhao-cai;XU Yan-zhou;MA Jun-jie(School of Civil Engineering,Beijing Jiaotong University,Beijing 100089,China;Baotou Highway Engineering Co.,Ltd.,Baotou Inner Mongolia 014000,China;China Railway Design Corporation Co.,Ltd.,Tianjin 300300,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100089 [2]包头市公路工程股份有限公司,内蒙古包头014000 [3]中国铁路设计集团有限公司,天津300300

出　　处：《公路交通科技》2023年第10期104-115,共12页Journal of Highway and Transportation Research and Development

基　　金：北京市自然科学基金面上项目(8192035)。

摘　　要：为促进预制拼装桥墩在中、高抗震设防烈度地区的可利用性,基于ABAQUS有限元模型开展了榫卯式节段拼装桥墩试验,进行了数值模拟对比。在纵向耗能钢筋不同截面配筋率、预应力筋不同初始预应力大小和有无黏结及不同布置位置的条件下对榫卯式节段拼装桥墩进行了抗震性能分析,并设计了一种外置可更换耗能软钢棒阻尼器,通过往复水平加载进行了抗震性能分析。结果表明:与未配置耗能钢筋的MTSP-S0相比,内置耗能钢筋可提高榫卯式节段拼装桥墩的水平承载能力及耗能能力,水平承载能力及耗能能力随着截面配筋率的增大而增大,截面配筋率增大到一定程度时,耗能能力及残余位移的增加有所变缓,存在震后不易修复等不足;预应力筋初始预应力的增大减小了耗能能力,但设置25%初始预应力大小的MTSP-Y0.25会由于墩底相对滑移过大而产生破坏,建议初始预应力不低于30%;预应力筋有无黏结及布置位置对水平承载能力、累积耗能等方面均有影响,对自复位能力影响较小;增设由4个软钢棒组成的外置耗能阻尼器MTSP-S0-D可大幅提高榫卯式节段拼装桥墩的水平承载能力、耗能能力,其抗震性能接近于配置4根直径为20 mm的内置耗能钢筋MTSP-S4,且外置耗能软钢棒阻尼器可以通过更换阻尼器的方式实现震后修复。In order to promote the usability of prefabricated assembled bridge piers in areas with medium and high seismic fortification intensity,experiments are conducted on mortise-tenon segmental piers based on the ABAQUS finite element model,and numerical simulation comparisons are conducted.A seismic performance analysis is conducted on mortise-tenon segmental piers under the conditions of different cross-sectional reinforcement ratios of longitudinal energy consuming steel bars,different initial pre-stress sizes of prestressed steel bars,presence or absence of bonding,and different placement positions.An external replaceable energy consuming soft steel rod damper is designed,and the seismic performance analysis is conducted through repeated horizontal loading.The result shows that(1)Compared with MTSP-S0 without energy consuming steel bars,the built-in energy consuming steel bars can improve the horizontal bearing capacity and energy consumption capacity of mortise-tenon segmental piers,and the horizontal bearing capacity and energy consumption capacity increase with the increase of section reinforcement ratio.When the section reinforcement ratio increases to a certain extent,the increase of energy consumption capacity and residual displacement slows down,and there are shortcomings such as difficulty in repairing after earthquakes.(2)The increase in initial prestress of prestressed reinforcement reduces energy dissipation capacity,but setting an MTSP-Y0.25 of 25%initial prestress size will cause damage due to excessive relative slip at the pier bottom.It is recommended that the initial prestress should not be less than 30%.(3)The presence or absence of bonding and placement of prestressed reinforcement have an impact on horizontal bearing capacity,cumulative energy consumption,and other aspects,but have a relatively small impact on self-centering capacity.(4)The addition of an external energy dissipation damper MTSP-S0-D composed of four soft steel bars can significantly improve the horizontal bearing capacity and en

关 键 词：桥梁工程 榫卯式节段拼装桥墩 数值模拟 抗震性能 震后修复 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]