The Applicability Study Of Reinforced Concrete Column Numerical Models Under Blast Loads

Recently, terrorism happens much more frequently than ever all over the world.At the same time, all kinds of physical and chemical explosion accident emerge inendlessly. These explosions seriously threaten people’s lives and property. Asimportant load-bearing elements and vertical supporting component of buildingstructure, the anti-explosion performance of reinforced concrete column directlyrelates to the blast resistance and progressive collapse resistance of structure.Using detailed model, fiber model and macro model respectively，the non-lineardynamic response of reinforced concrete column is researched using hydrocodeLS-DYNA. The primary work and achievements are as follows:（1） Dynamic response and damage degree of a typical reinforced concretecolumn under blast loads are studied based on detailed model. The results show thatthe dynamic response, the percentage of shear deformation over the total and thedamage degree of the column is increasing with the decreasing scale distance, whilethe residual capacity and response frequency are decreasing.（2） Refering to the detailed model of a reinforced concrete column, Theapplicability of fiber model of the column under blast loads is studied. Using samematerial’s constitutive model, detailed model and fiber model of the RC column areestablished. Through the comparison for the dynamic response of the two models, theresults show that fiber model could simulate bending deformation and section shearforce of the column under blast loads but not shear deformation, and is more efficientcomparing with detailed model.（3） Refering to the detailed model of a reinforced concrete column, Theapplicability of macro model of the column under blast loads is studied. the macromodel is established based on the fiber model through the combination with the springelements. Through the comparison for the dynamic response of macro model anddetailed model of RC column under blast loads, the results show that macro modelcould remedy the defects of fiber model obviously by accurately simulating bendingdeformation and section shear force and achieving the similar analysis results with thedetailed model with high computational efficiency at the same time.