钢筋混凝土框架柱地震损伤模型研究

发布时间：2018-12-06 07:45

【摘要】：地震作为一种毁灭性极强的自然灾害,它的发生往往会给建构筑物带来不同程度的打击,也会给人民生命财产造成严重的影响。而钢筋混凝土结构是当今使用最为普遍的一种结构,框架柱作为主要抗侧力构件,使得学者们越来越关注其在地震作用下的研究。本文采用理论分析和数值模拟结合的研究方法,通过对框架柱损伤性能的分析研究,得到了地震作用下框架柱的损伤演化规律。采用ANSYS建立有限元模型进行数值模拟,对设计的十个钢筋混凝土框架柱构件进行低周反复加载分析,得到各个构件的位移及内力变化情况,得出各个构件的滞回曲线和骨架曲线,分析其抗震性能。本文基于分析现有的国内外单参数、双参数地震损伤模型优缺点,利用损伤力学原理,提出了一种新的适用于钢筋混凝土框架柱双参数地震损伤模型。模型中利用构件的最大变形和累积滞回耗能两个破坏参数的线性组合来表达结构的损伤程度,并根据模拟钢筋混凝土框架柱构件的低周反复加载试验结果确定了模型的试验参数。将得到的新模型带入已知的相关试验数据和park-Ang模型等经典模型进行对比,以验证所提出模型的准确性。将模拟数据带入本文所提出的地震损伤模型中计算各构件的损伤指标,分析各个因素,即剪跨比、轴压比、混凝土强度对损伤演化的影响规律。这对于钢筋混凝土框架柱进行基于性能的抗震设计计算提供了参考。
[Abstract]:Earthquake as a devastating natural disaster, its occurrence will often bring different degrees of damage to the building structure, but also to people's lives and property serious impact. Reinforced concrete structure is one of the most widely used structures nowadays. Frame columns as the main lateral force resistant members make scholars pay more and more attention to their research under earthquake action. In this paper, the damage evolution law of frame column under earthquake action is obtained by combining theoretical analysis with numerical simulation. The ANSYS finite element model is used to simulate the design of 10 RC frame column members under low cyclic loading, and the displacement and internal force of each member are obtained. The hysteretic curve and skeleton curve of each component are obtained, and its seismic performance is analyzed. Based on the analysis of the advantages and disadvantages of the existing single-parameter and two-parameter seismic damage models at home and abroad, a new two-parameter seismic damage model for reinforced concrete frame columns is proposed by using the principle of damage mechanics. In the model, the damage degree of the structure is expressed by the linear combination of the two failure parameters of maximum deformation and cumulative hysteretic energy dissipation. The experimental parameters of the model are determined according to the low cycle repeated loading test results of the simulated RC frame column members. The new model is compared with the known experimental data and the park-Ang model to verify the accuracy of the proposed model. The simulation data are introduced into the earthquake damage model presented in this paper to calculate the damage index of each component, and the influence of various factors, that is, shear span ratio, axial compression ratio and concrete strength, on damage evolution is analyzed. This provides a reference for seismic design calculation of reinforced concrete frame columns based on performance.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU375

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