RC框架结构基于损伤的抗震性能评估方法研究

发布时间：2019-05-28 05:58

【摘要】：随着基于性能的抗震设计理论的发展,采用量化的性能指标来评估结构的抗震性能将成为必然,而损伤模型是实现结构性能目标数值化的重要途径。基于此,本文在试验研究的基础上,对钢筋混凝土结构的损伤模型及基于损伤的抗震性能评估方法进行了探讨分析。首先,本文根据我国现行规范设计制作了三根钢筋混凝土柱试件,进行了钢筋与混凝土材料的力学性能试验及试件拟静力试验,详细记录了试件的破坏过程、破坏形态、试验现象及水平力、柱顶侧移等响应,归纳整理了各钢筋混凝土柱的力-位移曲线、骨架曲线等试验结果,并从刚度退化、耗能能力、延性等方面分析了柱的抗震性能。其次,根据本文及Kunnath等人所完成钢筋混凝土试件的拟静力试验结果,选取了基于变形、退化、能量、低周疲劳及其组合形式等几种具有代表性的构件损伤模型,对试件进行损伤评估,分析了各损伤模型的适用性;接着,在OpenSees平台上,通过数值分析探讨了YeongAe Heo提出的基于材料层次的构件损伤模型的有效性与适用性,并确定了不同性能状态的损伤指标限值。最后,选取合理的加权方法,实现了基于材料层次与构件层次的结构损伤指标的计算;在此基础上,考虑地震动的随机性,以结构损伤指标为地震需求参数,对钢筋混凝土框架结构进行了基于IDA方法的易损性分析,并结合基于最大层间位移角的分析结果,探讨了结构基于损伤的抗震性能评估方法的可行性。
[Abstract]:With the development of performance-based seismic design theory, it is inevitable to use quantitative performance indexes to evaluate the seismic performance of structures, and damage model is an important way to realize the numerical value of structural performance objectives. Based on this, on the basis of experimental research, the damage model of reinforced concrete structure and the seismic performance evaluation method based on damage are discussed and analyzed in this paper. First of all, according to the current code of our country, three specimens of reinforced concrete columns are designed and manufactured in this paper. the mechanical properties test and quasi-static test of steel and concrete materials are carried out, and the failure process and failure form of the specimens are recorded in detail. The experimental results of force-displacement curve and skeleton curve of each reinforced concrete column are summarized and sorted out, and the seismic performance of the column is analyzed from the aspects of stiffness degradation, energy dissipation capacity, ductility and so on. Secondly, according to the quasi-static test results of reinforced concrete specimens completed by Kunnath et al., several representative damage models based on deformation, degradation, energy, low cycle fatigue and their combination forms are selected. The damage assessment of the specimen is carried out, and the applicability of each damage model is analyzed. Then, on the OpenSees platform, the effectiveness and applicability of the component damage model based on material level proposed by YeongAe Heo are discussed by numerical analysis, and the damage index limits of different performance states are determined. Finally, the reasonable weighting method is selected to realize the calculation of structural damage index based on material level and component level. On this basis, considering the randomness of ground motion and taking the structural damage index as the seismic demand parameter, the vulnerability of reinforced concrete frame structure based on IDA method is analyzed, and the analysis results based on the maximum interstory displacement angle are combined. The feasibility of seismic performance evaluation method based on damage is discussed.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU375.4;TU352.11

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