地震作用下基于刚度退化的钢筋混凝土框架结构累积损伤研究

发布时间：2019-04-27 16:57

【摘要】：众多的震害调查显示,作为目前应用最广泛的钢筋混凝土框架结构在不同强度的地震中都会遭受不同程度的损伤或破坏。如果结构在损伤的情况下继续使用,不加以修整维护,那么损伤就会随时间不断累积叠加并最终发展成破坏甚至倒塌。所以,将累积损伤效应的研究对象选为钢筋混凝土框架结构,使研究更具备现实意义和应用价值。本文以一幢六层钢筋混凝土框架结构职工宿舍楼为研究背景,以结构在不同地震加速度峰值组合作用下的累积损伤效应为研究对象。用ANSYS有限元分析软件,应用新提出的基于位移与刚度退化新型组合方式的双参数损伤模型,计算并分析钢筋混凝土框架结构在考虑累积损伤效应时的地震响应及损伤情况。通过以上研究工作,得出以下结论：(1)建立有限元模型后,对钢筋混凝土框架结构进行静力分析,分析钢筋混凝土框架结构在考虑刚度退化和不考虑刚度退化两种情况下的受力性能,进一步验证对结构进行损伤评估时,考虑刚度退化的分析结果更符合工程实际。(2)在总结和分析国内外具有代表性的单参数和双参数损伤模型的基础上,对有限元计算模型参数进行优化,提出了包括位移与刚度退化两个参数的新型组合方式的损伤模型。(3)用新型组合方式的双参数损伤模型对钢筋混凝土框架结构进行动力分析,得到位移时程曲线,对比钢筋混凝土框架结构在不同地震加速度峰值组合方式下受累积损伤效应的影响情况,并将计算分析结果与不考虑累积损伤效应时钢筋混凝土框架结构的损伤情况进行比较,研究其损伤规律。
[Abstract]:Many earthquake damage investigations show that the reinforced concrete frame structure, which is the most widely used at present, will suffer different degrees of damage or damage in earthquake of different strength. If the structure continues to be used under the condition of damage and does not be repaired and maintained, then the damage will accumulate over time and eventually develop into failure or even collapse. Therefore, the research object of cumulative damage effect is chosen as reinforced concrete frame structure, which makes the research more practical and practical. This paper takes a six-story reinforced concrete frame structure as the research background, and takes the cumulative damage effect of the structure under the combination of different earthquake acceleration peak values as the research object. The seismic response and damage of reinforced concrete frame structure considering cumulative damage effect are calculated and analyzed by using ANSYS finite element analysis software and a new two-parameter damage model based on a new combination of displacement and stiffness degradation. Through the above research work, the following conclusions are drawn: (1) after establishing the finite element model, the static analysis of reinforced concrete frame structure is carried out. The mechanical performance of reinforced concrete frame structure considering stiffness degradation and not considering stiffness degradation is analyzed, and the damage assessment of the structure is further verified. The analysis results considering stiffness degradation are more in line with the engineering practice. (2) on the basis of summarizing and analyzing the representative single-parameter and two-parameter damage models at home and abroad, the parameters of the finite element calculation model are optimized. A new combined damage model with two parameters of displacement and stiffness degradation is proposed. (3) the dynamic analysis of reinforced concrete frame structure is carried out by using the two-parameter damage model of new combination mode, and the displacement time history curve is obtained. The influence of cumulative damage effect on reinforced concrete frame structure under different combination modes of earthquake acceleration peak value is compared, and the results of calculation and analysis are compared with those of reinforced concrete frame structure without consideration of cumulative damage effect. The damage law was studied.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU375.4;TU317

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