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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。
Based on the discrete element method and the rod-end multi-spring model, a spring-restoring force model suitable for any loading path is introduced. The coupling effect between the concrete axial spring and the cross-section shear spring is considered and a reasonable spring failure criterion is established. The collision problem after failure is effectively treated. Based on this, a computer simulation program CSPF 1.0 that can simulate the whole collapse process of reinforced concrete frame structure under strong earthquake is developed. Taking an actual building in the disaster area of Wenchuan earthquake as an example, the entire process of the response of the structure under earthquake action is simulated by CSPF 1.0 program, and a strong beam - weak column collapse mode that may be produced by the earthquake is obtained. In addition, on the basis of increasing the section size and reinforcement of the original structure, the program further simulates the collapse mode of strong column and weak beam. Through the discussion and analysis of the simulation results, the reliability of the program CSPF1.0 and the feasibility of the discrete element method in the collapse analysis of reinforced concrete frame structure are illustrated. To some extent, the failure mechanism and collapse mechanism of the frame structure are revealed.