Numerical Simulation Of Steel Reinforced Concrete Columns Under Blast Loading

The progressive collapses of building structures under blast loading are often caused by the failure of the key members. Steel Reinforced Concrete(SRC) members are often used as the key members in structures because of their favorable performance.Study of SRC members under blast loading can provide theoretical bases for improving the highly dynamic properties of the overall structure. In this artical, a numerical simulation study on the dynamic response of SRC columns subjected to blast loading using hydrocode LS-DYNA is presented in the present thesis, The main contents are as follows:(1)The algorithm, basic equation, solution and key technologies of hydrocode LS-DYNA are introduced. Suitable dynamic constitutive models for concrete and steel are also presented. The classification of the explosion and the propagation characteristics of the shock wave is described. A simplified model about simulating blast loading,Conwep blast model, is introduced. The model is used to simulate the blast loading and the results obtained are compared with those data from TM5-1300.(3)Numerical model is constructed to calculate a typical SRC column, which is from an actual big project. The dynamic damage response of the SRC column under different blast loadings are simulated..(4)Simulation of concrete cracking is achieved by using erosion in concrete element. From the numerical results, it can be found that the development of damage is related to the crack propagation. Cracks appear where the large damage happen. So it is effective to determine cracks by observing damage in concrete.(5)A comprehensive damage assessment of the SRC column under blast loading is obtained by considering both the damage degree of concrete and the effective yield strain of steel. Based on the numerical results, damage conditions of the SRC for different blast loading cases can be predicted.