Local damage of the RC tunnels under ballistic missile impact investigated by finite element simulations

Abstract

This paper presents an investigation on the local damage of the reinforced concrete (RC) tunnels subjected to the ballistic missile attack using finite element (FE) analysis. For the impact simulation, four different types of the reinforced concrete tunnel covered by a soil layer of 15 m subjected to a SCUD missile impact are modeled using FE software LS-DYNA. SCUD missile is one of a series of tactical ballistic missiles developed by Soviet Union during the Cold War, which is adopted for a short-range ballistic missile. The four different types of RC tunnel are the most commonly used structural types for the subway tunnel in Korea. The developed FE model for the penetration depth of the missile impacting into the soil structure and for the RC structures under hard missile impact is verified from the well-known formula and experimental results, respectively. From the analysis results, the local damages of different types of RC tunnel are assessed and the effects of concrete strengths and reinforcement ratio on the local damages of RC tunnels are investigated.