摘要
为探究地震动入射方向、接缝螺栓对装配式竖井结构地震响应的影响,文章基于装配式竖井结构,采用地层结构法及黏弹性人工边界,对其抗震性能进行研究。采用分层壳单元、等效非线性弹簧分别对管片、接缝进行了模拟,在模拟得到真实结构地震响应的基础上,分别对地震动入射方向及环缝接缝剪切强度影响进行了对比分析,得到了对装配式竖井结构地震响应的影响因素,主要结论如下:(1)装配式竖井结构在地震作用下呈弯剪型变形,其地震响应主要由水平向入射地震动控制;(2)结构变形主要由环缝接缝刚度控制。随着环缝接缝刚度降低,结构侧向变形由弯曲型变形变为弯剪结合型变形,最终变为剪切型变形,进而影响结构环间张开、错台及环内直径变形率;(3)结构环内轴力为轴压力,与埋深呈正相关,与结构形式无关;结构环内所受弯矩水平较低,且以负弯矩为主,正弯矩主要集中于两侧肩部及趾部区域。结构纵向内力随结构埋深增加而增加,且其分布与结构变形模式具有较好的关联性。结构损伤水平较低,且受拉损伤明显高于受压损伤。
To investigate the effects of seismic wave incidence direction and joint bolts on the seismic response of prefabricated shaft,this paper utilizing stratum structure method and artificial boundaries to study the seismic performance of prefabricated shaft.Layered shell elements and equivalent nonlinear springs are used to simulate the:segments and joints behavior,respectively.Based on the simulated seismic response of the actual structure,a comparative analysis is conducted on the effects of seismic wave input direction and shear stiffness of circumferential joints.The main conclusions are obtained as follows.(1)The prefabricated shafts reveal bending and shear lateral deformation under seismic action,and its seismic response is primarily controlled by horizontally earthquake wave.(2)The structural deformation is mainly controlled by the stiffness of circumferential joints.As the stiffness of circumferential joints decreases,the lateral deformation changes from bending to bending and shear,and eventually to shear deformation.which in turn affects the opening and faulting between rings and the diameter deformation ratio within rings.(3)The axial force in radial direction is pressure,which is positively correlated with the burial depth and has less relation with structural form.The bending moment in radial direction is low,predominantly negative bending moments,with positive bending moments mainly concentrated in the shoulder and toe areas on both sides.The longitudinal internal forces inerease with the burial depth and have a good correlation with the structural deformation mode.Eventually,the structural damage is low,with tensile damage being significantly higher than compressive damage.
作者
王金龙
唐泽人
杜虎
李文彪
何丹
柳献
WANG Jinlong;TANG Zeren;DU Hu;LI Wenbiao;HE Dan;LIU Xian(China Railway Siyuan Survey&Design Group Co.,Ltd.,Wuhan 430073;Collge of Civil Engineering,Tongji University,Shanghai 200092;Changsha Metro Group Co.,Ltd.,Changsha 410027)
出处
《现代隧道技术》
CSCD
北大核心
2024年第S01期587-600,共14页
Modern Tunnelling Technology
基金
铁四院科技研究开发计划(2022K047-W02)
关键词
装配式竖井
抗震性能
数值模拟
入射方向
环缝接缝
Prefabricated shafts
Seismic performance
Numerical simulation
Seismic wave directions
Circumferential joints
作者简介
王金龙(1975-),男,工学硕士,高级工程师,主要从事隧道及地下工程、轨道交通方面的研究及设计工作,E-mail:003180@crfsdi.com;通讯作者:柳献(1977-),男,博士,教授,主要从事新型隧道及地下建筑结构受力性能与设计方法的研究工作,E-mail:xian.liu@tongji.edu.cn.
