钢管混凝土柱抗爆性能数值模拟与实验验证
摘要
Based on the LS-DYNA nonlinear finite element program and multi-material fluid-solid coupling method, the finite element model was developed to analyze dynamic responses and damage mechanisms of concreted filled steel tube (CFST) columns under blast loading, which were validated through comparison between simulated results and tested ones of the full-scale specimens. The effects of main parameters including the section form, the scale distance, the concrete strength, the steel strength and the section shape characteristics on the blast-resistant performance of the CFST columns were investigated with the finite element model. The results indicate that, the CFST columns have excellent anti-blast performances, and the proposed finite element model predicts the dynamic responses of the CFST columns under blast loading efficiently; the anti-blast performance of circular CFST columns is better than that of square ones; increasing the material strength and the length-width ratio of a rectangular CFST column can improve the blast-resistant performance, and decreasing the radius-thickness ratio of a circular CFST column also can promote that resistance.