Damage analysis of cut-and-cover tunnel structures under seismic loading

摘要: Damage analyses of rectangular cut-and-cover tunnels are performed to define the damage states and corresponding indices (DIs) under seismic loading. Single, double, triple box structures designed for metro subway systems in South Korea used. The tunnel modeled by nonlinear frame elements attached a series normal shear springs simulate soil–tunnel interaction. Pushover develop capacity curves monitor development plastic hinges. Parallel elastic also determine moments at which hinges form. For each site condition, three states, minor, moderate, extensive, defined terms number that form corners structure. Each state is linked DI, as ratio moment yield free-field strain. DI single shown be mostly independent wave velocity soil. values DIs single, range from 1.0 2.0. It highlighted proposed associated with strain provide an enhanced estimate seismically induced can easily utilized performance-based design.