【作者】 陈健；

【导师】 李琪； 汤保新；

【作者基本信息】 扬州大学 ， 结构工程， 2015， 硕士

【摘要】 强烈地震是人类面临的主要自然灾害之一。其中,房屋建筑的损毁和倒塌是造成人员伤亡及财产损失的最主要根源。现阶段我国抗震设计对大震没有量化计算,因此,研究建筑结构的抗地震倒塌性能,对提高建筑物的抗地震倒塌能力具有重要的意义。本文同时考虑地震动的不确定性与结构本身所带有的随机性,从全概率角度出发,初步提出了RC框架结构抗倒塌性能评估方法。文中,采用大型通用有限元软件MSC. Marc对结构算例进行了抗地震倒塌的IDA分析,基于4ATLAB软件引入了并行计算技术提高计算效率,采用对数正态拟合得到结构反应的易损性曲线,得到结构抗地震倒塌性能的各项指标。得到以下主要成果：(1)基于IDA与并行计算技术的Monte Carlo随机有限元方法和已有大型通用有限元程序,提出了一套具备全概率性质的建筑抗地震倒塌性能的评估方法,并编制了实现此方法的通用MATLAB程序。(2)通过对平面框架及整体模型算例进行计算分析,得到了结构抗地震倒塌的各项指标,验证了本文所提出方法的准确性及高效性,其计算结果可对结构的性能进行评估。(3)利用本文提出的结构抗地震倒塌性能评估方法,可对结构可靠度指标进行敏感性分析,找出结构设计与工程建造的关键控制因素,提出设计、施工建议,有利于提高建筑结构抗地震倒塌能力。更多还原

【Abstract】 Earthquake is one of the major natural disasters that human beings are facing. Among them, building collapse is the main reason cause of casualties and property loss. Currently we did not quantify the seismic design of maximum considered earthquake, therefore, the study of aseismic performance, and try to improve the building’s earthquake resistance capability is extremely important.This paper considering the earthquake uncertainty and the randomness of structure, start from the perspective of the total probability, proposed an anti-collapse performance evaluation method for RC frame structures. In the paper, a structure example is subjected to an incremental dynamic analysis by using MSC. Marc, based on MATLAB introduces parallel computing to improve efficiency, using lognormal fitting fragility curves of structure, obtained the indicators of structural performance.Through the work, this paper gets the following main achievements:(1) Based on IDA and the parallel computing technology, using the Monte Carlo stochastic finite element method and commonly used finite element software, this paper proposed a new full probabilistic evaluation method of the building capability in earthquake, and written the MATLAB procedure.(2) Through calculate and analyze on a plane frame and a general model, obtained the indicators of structures’aseismic performance, verify the accuracy and efficiency of the proposed method, the results can be evaluated on the performance of structure.(3) Use the proposed method for the structural reliability sensitivity analysis, we can identify the key control factor of structural design and construction, propose suggesting, helping improve the seismic collapse resistance of building structures.更多还原