基于OpenSEES的FRP加固装配式梁柱节点抗震性能研究

Research on seismic properties of FRP reinforcement fabricated beam-column joints based on OpenSEES

为研究FRP加固对装配式梁柱节点及整体框架结构抗震性能的影响,本文基于OpenSEES有限元程序,建立了某装配式梁柱节点的有限元计算模型,以相关试验为基础,比较验证了所建有限元模型的可靠性。同时选用合适的FRP约束混凝土本构关系来表征FRP对混凝土性能的提升作用,设计3种装配式梁柱节点FRP加固方案,并通过有限元数值模拟,分析比较了节点承载力、滞回曲线和位移延性的差异,考察了FRP包裹层数等因素对节点承载力的影响。随后对装配式框架结构设计了3种FRP加固方式,并选取3条地震波进行结构动力时程分析以考察结构抗震性能。结果表明:FRP环向包裹加固及纵向加固能分别有效提高节点的延性能力和承载能力;FRP加固的装配式框架结构具有更好的延性及耗能能力,能有效增强结构的整体抗震性能,为装配式结构FRP加固设计提供参考。

In order to study the effect of FRP reinforcement on the seismic performance of fabricated beam-column joints and integral frame structures,this paper established a finite element calculation model of fabricated beam-column joints based on OpenSEES finite element software.Based on the relevant test results,the reliability of the finite element model is verified by comparison.The proper constitutive relation of FRP-confined concrete is selected to characterize the improvement of FRP on concrete performance.And three reinforcement schemes of fabricated beam-column joints are designed.Through finite element numerical calculation,the differences in the bearing capacity,hysteresis curve and displacement ductility of the joints are analyzed and compared,and the influence of factors such as the number of FRP cladding layers on the bearing capacity of the joints is investigated.Then three types of FRP reinforcement methods are designed for the fabricated frame structure,and three types of seismic waves are selected for dynamic time history analysis to investigate the seismic performance of the structure.The results show that the ductility and bearing capacity of the joint can be effectively improved by circumferential wrapped FRP and longitudinal strengthened FRP respectively;The fabricated frame structure strengthened with FRP has better ductility and energy dissipation capacity,and can effectively enhance the overall seismic performance of the structure,which provides a reference for the design of fabricated structure strengthened with FRP.