钢筋混凝土端面重墙结构的抗爆性能规律

To study the performance of reinforced concrete blast resistant wall under explosion shock wave, the damage laws of D1, D2 and D3 walls are studied by numerical simulation based on the test with maximum TNT equivalent of 300 kg. Based on LS-DYNA finite element software, a fluid-solid coupling numerical model is applied to calculate the failure modes of the walls under explosion, and the model parameters are corrected according to the test results. ConWep algorithm is used to apply the explosive load, and the failure characteristics of the walls under different overpressures and impulse loads are simulated by controlling the charge mass and explosive distance. Based on the residual dip angle of blast resistant wall after explosion, the numerically calculated results are divided into three damage levels. The overpressure-impulse curve and the charge mass-explosive distance curve obtained by fitting can be used for designing the safety distance of burning explosive plant and the warehouse capacity, and estimating the degree of damage under accidental explosion. By comparing the overpressure-impulse curves of three configurations of walls, it is found that the blast resistance of small size D2 is the weakest; when the peak overpressure of explosion load is small, the blast resistance of D3 is similar to that of D1; and when the overpressure is large, the failure mode of D3 changes, and the overpressure-impulse curve has a tendency of right deviation.