RESIDUAL DYNAMIC RESISTANCE ASSESSMENT OF SEISMIC DAMAGED UNDERGROUND ARCH UNDER NON-UNIFORM EXPLOSION LOADING

For the sake of the ability assesment of anti non-uniform dynamic loading of the damaged structure after earthquake, simplified structural models for damaged arches, including two-hinged and three-hinged arches, were built according to the damage modes and distributions. Residual dynamic resistances of seismic damaged underground arches were calculated by an equivalent static load method. Through an example, moments of arches with different constraints were calculated under non-uniform explosion loading, as well as the thrust force at the foot of the arches. Then the ability of anti-dynamic loads of the damaged structure after eartheuake was evaluated. It is concluded that under non-uniform explosion loading the load capapcity of the damaged arch drops at a level of 13 percent or even 50 percent when controled by bending or shear resistance, respectively.