爆炸冲击荷载作用下SRC柱等效单自由度模型

EQUIVALENT SINGLE DEGREE OF FREEDOM MODEL OF SRC COLUMNS UNDER BLAST LOADING

爆炸冲击荷载作用下结构构件的反应分析方法常用的是等效单自由度模型,在现有的有关资料中,等效单自由度模型主要用于钢筋混凝土构件和钢构件。等效单自由度模型的关键是确定等效弹性位移、破坏位移和屈服强度。以通用有限元分析软件LS-DYNA为基础,研究了钢骨混凝土(SRC)柱在爆炸冲击荷载作用下的反应特征,确定出了等效单自由度模型的等效弹性位移和破坏位移;以常规SRC柱设计理论为基础,提出了等效单自由度模型的等效屈服强度计算公式。最后用所建立的等效单自由度模型和LS-DYNA软件分别对8根SRC柱共48种爆炸冲击荷载工况进行对比分析,验证了所提出的等效单自由度模型。

The analysis of structures subjected to loads due to explostion is often treated by means of equivalent single degree of freedom model(ESDOFM).The most important parameters in the ESDOFM are the equivalent elastic displacement,equivalent limited displacement and equivalent yield strength.In the present paper,the equivalent elastic displacement and limited displacement of steel-reinforced-concrete(SRC)columns subjected to blast loading are evaluated based on the results of numerical simulation studies using LS-DYNA.A method to compute the equivalent yield strength of SRC columns is proposed,and the ESDOFM of SRC columns subjected to blast loading is then established.Finally,8 SRC columns are analyzed using the ESDOFM and LS-DYNA software respectively.It is found that the ESDOFM proposed is suitable for the design analysis of SRC columns under blast loading.