钢管混凝土柱抗爆性能数值模拟与实验验证

Numerical Simulation and Test Validation for Concreted Filled Steel Tube Columns Under Blast Loading

利用LS⁃DYNA非线性有限元程序,基于多物质流固耦合方法,建立了爆炸荷载作用下钢管混凝土柱的动态响应数值模型.对比分析了模拟结果与足尺构件的爆炸破坏实验结果,验证了数值模型和计算方法的有效性,并运用参数化分析方法,研究了截面形式、比例距离、混凝土强度及钢材等级、截面形状特性等关键参数对钢管混凝土柱抗爆性能的影响.研究结果表明:钢管混凝土柱具有优越的抗爆性能,所建立的数值模型能够有效地分析钢管混凝土柱在爆炸荷载作用下的动态影响及破坏形态;圆形截面钢管混凝土柱的抗爆性能优于方形截面;提高材料等级、减小圆形截面钢管混凝土柱的径厚比、增大矩形截面钢管混凝土柱的长宽比,均有利于提升钢管混凝土柱的抗爆特性.

Based on the LS⁃DYNA nonlinear finite element program and multi⁃material fluid⁃sol⁃id 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 effi⁃ciently;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.