基于非线性等效SDOF体系的RC框架结构抗地震倒塌能力分析

发布时间：2018-06-19 03:22

本文选题：等效SDOF体系 + 改进I-K模型　；参考：《哈尔滨工业大学》2014年硕士论文

【摘要】：在地震作用下，建筑结构的倒塌不仅会造成人员伤亡和经济损失，还会给社会带来很大的影响，因此保证建筑结构抗地震倒塌能力成为基于性能抗震设计的核心目标。建筑结构倒塌破坏的根本原因是结构构件的刚度和强度退化。因此考虑构件刚度和强度退化的抗地震倒塌能力成为基于性能的地震工程的主要研究内容。通过动力学平衡方程和能力谱加速度A-能力谱位移D格式转换，，本文将原结构Pushover曲线等效成SDOF体系的骨架曲线，基于OpenSees有限元软件，将改进I-K模型作为等效SDOF体系的恢复力模型，通过考虑地震动与结构不确定性，对RC框架结构的等效SDOF体系进行抗地震倒塌能力分析。本文的研究内容主要分为以下四个部分： 1．介绍了国内外抗地震倒塌能力的研究进展，分别从不考虑构件退化性能和考虑构件退化性能的结构抗地震倒塌能力、基于实验的结构抗地震倒塌能力和基于等效SDOF体系的结构抗地震倒塌能力进行分析。 2．介绍了将原结构的Pushover曲线通过能量法和FEMA法等效成SDOF体系的方法，以及基于OpenSees软件对非线性等效SDOF体系进行建模的过程，并且通过对比结构构件的滞回模型，将考虑构件刚度和强度退化的改进I-K模型作为等效SDOF体系的恢复力模型。 3．介绍了影响非线性等效SDOF体系抗地震倒塌能力的因素，分别从是否考虑P-Δ效应、使用能量法及FEMA法等方面对非线性等效SDOF体系进行增量动力分析及倒塌易损性分析，从而得到考虑地震动随机性的等效SDOF体系的抗地震倒塌能力中位值、对数标准差以及倒塌裕度比。 4．介绍了知识不确定性对RC框架结构等效SDOF体系抗地震倒塌能力的影响，对综合考虑结构模型参数不确定性和地震动不确定性的等效SDOF体系进行基于增量动力分析的倒塌易损性分析，与只考虑地震动不确定性的等效SDOF体系抗倒塌能力中位值、对数标准差以及倒塌裕度比进行对比分析。
[Abstract]:Under the action of earthquake, the collapse of building structure will not only cause casualties and economic losses, but also bring great influence to the society. Therefore, ensuring the anti-seismic collapse ability of building structure becomes the core goal of performance-based seismic design. The fundamental cause of collapse and failure of building structure is the degradation of stiffness and strength of structural members. Therefore, the anti-collapse ability of member stiffness and strength degradation has become the main research content of performance-based seismic engineering. Through the transformation of dynamic equilibrium equation and A- capacity spectrum displacement D scheme, the pushover curve of the original structure is equivalent to the skeleton curve of SDOF system, and based on OpenSees finite element software, the pushover curve of the original structure is equivalent to the skeleton curve of the SDOF system. The improved I-K model is used as the restoring force model of the equivalent SDOF system. The seismic collapse resistance of the equivalent SDOF system of RC frame structure is analyzed by considering the ground motion and structural uncertainty. The main research contents of this paper are as follows: 1. The research progress of anti-seismic collapse ability at home and abroad is introduced. The seismic collapse resistance of structures based on experimental and equivalent SDOF systems is analyzed. 2. The method of equating the pushover curves of original structures to SDOF system by energy method and FEMA method is introduced. And the process of modeling the nonlinear equivalent SDOF system based on OpenSees software, and comparing the hysteretic model of structural components, The improved I-K model, which considers the stiffness and strength degradation of the member, is used as the restoring force model of the equivalent SDOF system. 3. The factors affecting the seismic collapse resistance of the nonlinear equivalent SDOF system are introduced, and the P- 螖 effect is taken into account, respectively. The incremental dynamic analysis and collapse vulnerability analysis of nonlinear equivalent SDOF system are carried out by using energy method and FEMA method, and the median value of the anti-collapse ability of the equivalent SDOF system considering the randomness of ground motion is obtained. The logarithmic standard deviation and collapse margin ratio. 4. The effect of knowledge uncertainty on the seismic collapse resistance of the equivalent SDOF system of RC frame structures is introduced. Based on incremental dynamic analysis, the collapse vulnerability analysis of equivalent SDOF system with structural model parameter uncertainty and ground motion uncertainty is carried out, and the median value of equivalent SDOF system's anti-collapse ability considering only ground motion uncertainty is analyzed. The logarithmic standard deviation and collapse margin ratio are compared and analyzed.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU375.4;TU352.11

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