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 

作者机构：Department of Geotechnical EngineeringCollege of Civil EngineeringTongji UniversityShanghai 200092China China Railway Design CorporationTianjin 3000142China 

出 版 物：《Underground Space》 (地下空间（英文）)

年 卷 期：2022年第7卷第6期

页      面：1115-1124页

核心收录：

学科分类：081406[工学-桥梁与隧道工程] 08[工学] 0814[工学-土木工程] 082301[工学-道路与铁道工程] 0823[工学-交通运输工程] 

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) 

主　　题：Nonlinear analysis Concrete structures Composite structures Shield tunnels Full-scale test 

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 *** nonlinear mechanical behavior of concrete is described by a plastic-damage *** nonlinearity,resulting from the interface of the SCC and reinforced concrete(RC)segments,is simulated with the help of a system of *** analysis results are compared with those obtained from a full-scale test of a tunnel *** agreement validates the usefulness of the 3D FE *** re-analysis of the test shows that the interfacial connectors govern both the strengthening effect of SCC and the failure pattern of the strengthened ***,the force-transmitting capacity of the interfacial connectors should be concerned in design *** regards the circular segments,the interfacial connectors refer to both the shearing and the stripping *** composite effect of the SCC and RC segments increases with the increasing number of these *** latter,therefore,results in the increases of the bearing capacities and stiffnesses of the strengthened *** increases become insignificant as the number of these connectors is sufficient to ensure a perfect composite effect of the SCC and RC *** 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.