【摘要】 基于离散单元法和杆端多弹簧模型的思想,引入适用于任意加载路径的弹簧恢复力模型,考虑混凝土轴向弹簧与截面剪切弹簧的耦合效应,建立了合理的弹簧破坏准则,并对单元失效后的碰撞问题进行了有效的处理,在此基础上开发了能够模拟强震作用下钢筋混凝土框架结构倒塌全过程的计算机仿真程序CSPF 1.0。以汶川地震灾区一实际建筑为例,利用CSPF 1.0程序模拟了地震作用下该结构响应的全过程,得到了该结构可能产生的强梁弱柱型倒塌模式。另外在增大原结构的柱截面尺寸及配筋的基础上,程序进一步模拟了强柱弱梁型的倒塌模式。通过对仿真结果的论述和分析,说明了程序CSPF1.0的可靠性和离散单元法在钢筋混凝土框架结构倒塌分析中的可行性,并在一定程度上揭示了框架结构的破坏机理和倒塌机制。更多还原

【Abstract】 A simulation program,named CSPF 1.0,was established based on discrete element method and segment-multi-spring model to simulate the collapse process of RC frame structures under strong earthquake,by introducing restoring force models for springs which can be used for arbitrary loading path,defining reasonable failure criteria of the springs in which coupled effect of concrete spring and sectional shear spring was taken into account,and considering impact effect between failure elements.This program was employed to simulate the whole process of structural response with respect to a real building experiencing Wenchuan earthquake.Furthermore,the collapse model of this structure was found to be a typical collapse pattern of strong-column and weak-beam.Increasing the cross-sections and the reinforcement ratios of all the columns,the program successfully obtained the collapse pattern of strong-column and weak-beam.Through the discussion and analysis of simulation results,the reliability of CSPF 1.0 and the feasibility of discrete element method in collapse analysis for frame structures can be obtained,meanwhile structural failure and collapse mechanism for RC frame structures are revealed in some extent.更多还原