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该文以钢筋混凝土低延性框架结构为分析对象,总结该类结构及相关构件数值分析研究现状;基于桁架模型研究柱及节点组合体等关键构件的精细模型化思路与方法,并分别采用试验予以验证;以此为基础,借助在Open Sees软件中开发的数值子结构方法及平台,以汶川地震中严重受损的多层钢筋混凝土框架结构为对象建立精细化数值子结构模型,通过局部构件的精细分析研究其在强震作用下的抗震性能及失效模式。经该文研究表明采用桁架模型建立易于发生脆性破坏的柱及节点组合体等关键构件的精细化模型合理且准确;选择数值稳定且更适用的精细化模型与数值子结构平台分析涉及不同类型且易发生脆性破坏的低延性结构更具优势;针对低延性框架,不宜采用位移角限值作为结构性能评估的唯一判断依据,在分析中需考虑未达到目标位移前结构可能发生的脆性破坏模式。
In this paper, the low-ductility reinforced concrete frame structure as the analysis object, summarizes the current status of numerical analysis of such structures and related components; based on the truss model of the column and the node assembly and other key components of the fine modeling ideas and methods were used to test Based on this, with numerical substructure method and platform developed in Open Sees software, a refined numerical substructure model is established for the severely damaged multi-story reinforced concrete frame structure in Wenchuan earthquake, A detailed analysis of its seismic behavior under earthquake and failure mode. The study shows that the use of truss model to establish brittle fracture prone columns and node assembly and other key components of the refinement model is reasonable and accurate; select the numerical stability and more applicable to the refined model and numerical substructure platform analysis involves different types and The low ductile structure prone to brittle failure has more advantages. For the low ductility framework, the displacement angle limit should not be used as the sole criterion for structural performance evaluation. The brittle failure mode that may occur before the target displacement is considered must be considered in the analysis.