采用基于离散单元开发的仿真程序CSPF1.0对一榀模拟底层中柱失效的连续倒塌试验框架进行了计算分析,所得到的中柱荷载一位移曲线与试验曲线吻合较好,说明了仿真程序用于大位移大变形下的钢筋混凝土框架结构分析的可靠性。在此基础上,进一步加大竖向荷载对试验中未获得的连续性倒塌全过程进行了模拟。仿真结果与已有试验现象相符且对最终的倒塌过程给出了合理的预期,从而表明CSPF1.0程序能够较好地用于包括单元不连续及接触碰撞在内的连续性倒塌全过程的模拟。
A program named CSPF 1.0 on the basis of discrete element method which can be used to simulate progressive collapse of RC plane frames due to the failure of a middle column in the first floor was developed in this paper. The obtained load-displacement curve of the middle column is in good agreement with the experimental curve, which shows reliability of the program when applied to structural analysis of large deformation. Further efforts have been made to simulate the entire collapse process of the frame when subjected to larger vertical load. Numerical results match the experimental phenomena very well and also give a good prediction of collapse process, which demonstrates that this program could simulate the entire process of continuous collapse including discontinuity and contact-collision between elements.