基于OpenSEES的装配式混凝土框架节点数值模拟方法研究

Investigation on modelling approaches for prefabricated concrete beam-to-column connections using openSEES

装配式混凝土框架结构是目前应用最广的装配式结构体系之一,该结构中的梁柱连接节点是核心受力部位,不仅影响着整体结构的抗震性能,也直接关系到施工的便易性与经济性。针对不同类型装配式混凝土结构梁柱节点的非线性行为特征,文中基于OpenSEES软件系统地研究了其数值模拟方法,提出适用于湿式连接节点与干式连接节点的两类分析模型,并同时考虑如键槽、预应力、耗能件等局部构造措施的影响。为验证该文提出模型的有效性与准确性,进行10个不同类型的装配式节点低周反复加载试验的数值模拟,并给出各类型的建模参数取值。计算结果表明,文中提出的模拟方法不仅可以准确地反映节点的宏观力学行为(如峰值承载力、刚度退化等),同时可以预测局部材料的微观受力状态与行为,可为今后的装配式混凝土节点建模分析提供参考。

Prefabricated concrete frame structure is one of the most widely used prefabricated structural systems.The crucial part of this kind of structures is the beam-to-column connection,which not only affects the global seismic performance,but is also related to the overall feasibility and the economic efficiency in construction.According to the nonlinear characteristics of different kinds of prefabricated beam-to-column connections,numerical simulation methods based on OpenSEES software are systematically investigated,and two types of analysis models are developed for wet connection and dry connection,respectively,with the influences of some local features,such as the key groove length,pre-stressing and dampers,considered in the models.To validate the developed numerical models,10 prefabricated beam-to-column connections under cyclic loading were simulated and the values for the parameters of each model were given.The calculation results indicate that the models can represent not only the macro-behaviors of the connections(e.g.,the peak bearing capacity,the strength and stiffness degradation),but can also predict the stress states and micro-responses of local materials.The work can provide references for future modeling analysis of prefabricated concrete structure.