Vulnerability Assessment of Precast Segmental RC Bridge Piers Under Near-field Explosion
To evaluate the damage extent of a precast segmental reinforced concrete(RC)bridge pier under a near-field explosion,this study conducted a near-field blast test of a precast segmental RC bridge pier;subsequently,a three-dimensional finite element accurate model of the precast segmental RC bridge pier was established,and the axial residual bearing capacity was employed as the explosion damage evaluation index.The uncertainty quantification of near-field explosion load was analyzed,the explosion damage extent and probability distribution of the damage coefficient were studied based on the blast loading sampled using the TNT equivalent and explosion center distance,and the vulnerability of the precast segmental RC bridge pier under near-field explosion was evaluated.The results show that the precast segmental RC bridge pier has a local punching failure and the maximum residual displacement in the bottom segment under the near-field explosion test.A numerical simulation is consistent with experimental results,and the axial residual bearing capacity obtained by the restart is feasible.The explosion damage coefficient of the precast segmental RC bridge pier is obtained based on the TNT equivalent and explosion center distance,and the damage coefficient under different TNT equivalents is lognormal distribution.The vulnerability curve of the precast segmental RC bridge pier under a near-field explosion is obtained based on the lognormal probability density and conditional probability,which can be used to evaluate the explosion damage extent of precast segmental RC bridge piers under different TNT equivalents.This paper provides a reference for rapidly assessing explosion damage to precast segmental RC bridge piers.
bridge engineeringvulnerability assessmentnumerical simulationprecast segmental RC bridge piernear-field blast test
万方数据
维普
