盾构法扩建地铁车站Y形装配式节点抗震性能研究  

Experiment on seismic of Y-shaped assembled joints in subway station build by enlarging the shield tunnels

作　　者：束双武 吴昊 许煜成 周爱兆[2] 刘义 SHU Shuangwu;WU Hao;XU Yucheng;ZHOU Aizhao;LIU Yi(Zhenjiang Planning Survey and Design Group Co.Ltd.,Zhenjiang 212004,China;School of Civil Engineering and Architecture,Jiangsu University of Science and Technology,Zhenjiang 212100,China)

机构地区：[1]镇江市规划勘测设计集团有限公司,镇江212004 [2]江苏科技大学土木工程与建筑学院,镇江212100

出　　处：《江苏科技大学学报（自然科学版）》2024年第4期72-78,共7页Journal of Jiangsu University of Science and Technology:Natural Science Edition

基　　金：城市与工程安全减灾省部共建教育部重点实验室重点项目;北京市自然科学基金项目/北京市教育委员会科技计划重点项目(KZ201410005007)。

摘　　要：为了提高结合盾构法扩建地铁车站结构的抗震性能,提出一种Y形装配式连接节点,用于连接装配式盾构管片和现浇车站主体结构,为研究Y形装配式节点的抗震性能,文中建立了两种连接类型的Y形装配式节点1∶1比例试验模型,并进行了拟静力加载试验,对不同类型节点的荷载-位移滞回特性、延性和位移特征、刚度退化特性以及斜拉筋应变模式等进行了对比研究.结果表明:①由于两类节点构造上的不同,B类节点后期加载中由于盾构管片与钢板脱离使得管片位移变形较大,滞回环捏拢效应较为明显,节点卸载后的残余变形更为显著;②由于接缝为斜截面,节点滞回曲线及骨架曲线表现出明显的非对称特性.从整个加载过程来看,B类节点承载能力更高,工作性能更为稳定,节点延性更好;③两类节点耗能机理不同,B类节点钢板刚度大,墙柱内钢筋变形较小,只有管片一侧钢筋和混凝土损伤变形耗能,而A类节点由于采用接驳器连接,接缝两侧钢筋可同时发生变形,其耗能能力略高于B类节点,但由于节点破坏主要受控于管片混凝土材料的强度,因此,两类节点最终耗能能力相差不大.A Y-shaped assembled joint between shield segments and the main station structures was suggested in order to enhance the seismic performance of a subway station constructed by extending two parallel shield tunnels.A 1∶1 full-scale model of two joints was used in experiments on low-frequency cyclic loading.The seismic behaviors,such as load-deformation curves,skeleton curves,structural ductility,strength degradation,and strain of the diagonal bars,were studied.The results showed that①the shield segment separated from the steel plate,and the displacement of the B joint was greater than the A joint due to the differing constructions of the two types of joints.The residual deformation of the B joint and the pinch effect of the hysteresis loop were more noticeable;②as a result of the joint's inclined section,the hysteretic curve and skeleton curve both clearly displayed asymmetries.B joint had greater bearing capacity,more consistent operating performance,better ductility,and less stiffness deterioration during the entire loading operation;and③two different types of joints had different energy dissipation mechanisms.The steel plate of the B joint had more stiffness than the A joint.The reinforcement deformation of the B joint in the wall column was small,and the damage and deformation of the segment's reinforcement and concrete caused most of the energy dissipation.However,because A joint was connected by the connectors,the reinforcement on both sides deformed simultaneously,and the energy dissipation of A joint was rather higher than the B joint's.The failure of both of the joints was mainly because of the crushed segment concrete,and the energy-dissipating capacity of the two types of joints was approximately the same.

关 键 词：盾构扩建车站 Y形装配式节点 低周反复加载试验 抗震性能 滞回耗能 

分 类 号：TU93[建筑科学—结构工程] TU94