Dynamic response of reinforced concrete wall under blast loading

摘要

Dynamic response of reinforced concrete (RC) wall under blast loading is presented. The RC wall is modeled using shell elements in a finite element (FE) software and the steel reinforcement is modeled with the built-in rebar option. The concrete damaged plasticity constitutive model is used to simulate the stress-strain response of concrete for both strain rate independent and rate dependent modeling. Steel reinforcement is modeled using the von-Mises plasticity model for strain rate independent and Johnson-Cook (J-C) plasticity model for strain rate dependent simulations. Blast load is simulated in the form of an equivalent triangular pressure pulse calculated as per TM5-1300 and UFC 3-340-02 codes. The effect of different parameters such as (ⅰ) wall thickness, (ⅱ) compressive strength of concrete, (ⅲ) percentage of reinforcement, (ⅳ) tensile yield strength of steel reinforcement, (ⅴ) reinforcing bar diameter, and (ⅵ) strain rate dependent properties of concrete and steel are investigated. Mainly, thickness of the RC wall and grade of concrete govern the blast response predominantly as compared to the percentage of reinforcement, diameter of the rebar, and grade of steel. The RC walls with strain rate dependent material properties exhibit reduced displacement as compared to that with rate independent material properties.