Numerical analysis of tunnel segments strengthened by steel-concrete composites  

作　　者：Jiao-Long Zhang Xian Liu Tian-Yu Ren Yi-Ming Shi Yong Yuan 

机构地区：[1]Department of Geotechnical Engineering,College of Civil Engineering,Tongji University,Shanghai 200092,China [2]China Railway Design Corporation,Tianjin 3000142,China

出　　处：《Underground Space》2022年第6期1115-1124,共10页地下空间（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.52078376,51908424,and 52038008);the Shanghai Rising-Star Program(Grant No.22QB1405000);the State Key Laboratory for Hazard Reduction in Civil Engineering of Tongji University(Grant No.SLDRCE19-B-39).

摘　　要：In order to study the feasibility of strengthening of segmental tunnel linings by using steel-concrete composites(SCC),a three-dimensional(3D)finite element(FE)model is proposed in this paper.The nonlinear mechanical behavior of concrete is described by a plastic-damage model.The nonlinearity,resulting from the interface of the SCC and reinforced concrete(RC)segments,is simulated with the help of a system of springs.The analysis results are compared with those obtained from a full-scale test of a tunnel segment.Their agreement validates the usefulness of the 3D FE model.Numerical re-analysis of the test shows that the interfacial connectors govern both the strengthening effect of SCC and the failure pattern of the strengthened segments.Thus,the force-transmitting capacity of the interfacial connectors should be concerned in design activities.As regards the circular segments,the interfacial connectors refer to both the shearing and the stripping connectors.The composite effect of the SCC and RC segments increases with the increasing number of these connectors.The latter,therefore,results in the increases of the bearing capacities and stiffnesses of the strengthened segments.Those increases become insignificant as the number of these connectors is sufficient to ensure a perfect composite effect of the SCC and RC segments.In addition,the numerical simulations show that using high-performance steel shell(HPS)or/and ultra-high-performance concrete(UHPC)is an effective way to increase the strengthening effect of SCCs.

关 键 词：Nonlinear analysis Concrete structures Composite structures Shield tunnels Full-scale test 

分 类 号：U45[建筑科学—桥梁与隧道工程]