地震作用后钢筋混凝土框架结构恢复性模拟研究
Simulation of the Resilience of Reinforced Concrete Frame Structures after Earthquake

钢筋混凝土框架结构在地震冲击后，其刚体退化特性复杂，存在模拟时结果失真明显的问题。为此，在考虑刚度退化规律的基础上进行分析模拟，研究地震冲击下钢筋混凝土框架结构的恢复性。提取地震作用下钢筋混凝土框架结构滞回曲线，通过有限元分析获取不同的特征点，形成恢复力模型的骨架曲线；依据恢复力模型骨架曲线和刚度退化规律，构建滞回曲线，模拟地震作用后钢筋混凝土框架结构恢复过程。在模拟的钢筋混凝土框架结构恢复实验中，层间位移结果低于5 mm、层间绝对加速度和柱底抬升结果的误差均低于0.1 mm；模拟得到结构的弯矩缝隙都能够实现闭合，钢筋混凝土结构未出现屈服现象，说明模拟的结果较好。
After an earthquake shock, reinforced concrete frame structures feature complex stiffness degradation, and the simulation results are considerably distorted. Therefore, analysis and simulation were performed considering the stiffness degradation law to study the resilience of a reinforced concrete frame structure under earthquake impact. The hysteretic curve of the reinforced concrete frame structure under earthquake was extracted, and different characteristic points were obtained via finite element analysis to form the skeleton curve of restoring force model. According to the skeleton curve and stiffness degradation rule of the restoring force model, the hysteretic curve was constructed to simulate the restoration process of the reinforced concrete frame structure after the earthquake. The restoration experiment simulation results of the reinforced concrete frame structure showed that the story drift was less than 5 mm, and the errors of absolute story acceleration and column bottom lifting were both less than 0.1 mm. The bending moment gap could be closed, and there was no yield phenomenon in the structure, indicating that the simulation results are reasonable