基于地震能量输入历程的RC框架往复推覆分析方法研究
发布时间：2019-01-11 09:51
【摘要】：地震灾害的巨大经济损失促使人们对基于承载力的抗震设计方法进行反思,1995年美国学者首次提出基于性能的抗震设计思想,受到国内外学者的广泛关注。Pushover分析作为一种进行结构地震非线性分析的简化方法,在一定条件下可以较为准确、简便地评估结构的性能水平,在建筑结构抗震分析和设计中得到了广泛应用。但是传统的Pushover分析,通常采用的是一个单向的加载过程,逐级加载以达到结构破坏的目标值。但在实际的地震作用下的结构所受的是往复受力过程,显然单向的加载模式不能够准确的反应地震作用下结构和构件的真实受力特性,而且不同的水平侧向力加载模式对分析结果有较大差异。通过考虑传统的Pushover分析在单向加载和水平侧向力分布模式的不足,本文提出了基于变形能耗散历程往复推覆分析方法下的水平侧向力分布模式,这种水平侧向力分布模式在结构性能设计当中获得了良好的效果。通过对结构能量输入历程特征的描述以及建立结构变形能耗散历程的简化模型,获取对结构进行往复推覆分析的历程控制参数,从而在实现最大变形与累积耗能双控的同时,考虑耗能历程对结构损伤的影响。这里主要对结构进行均布分布、倒三角分布、抛物线分布和随振型而变的自适应分布四种侧向力加载模式下往复推覆分析,并与单向推覆分析和动力时程分析结构对比。分析表明：随振型而变的自适应分布模式往复推覆分析方法能够较为准确的估计结构在地震作用下的出铰模式、最大层间位移、累积滞回耗能及滞回耗能的分布；不同侧向力加载模式下往复推覆分析的可行性以及为Pushover分析中侧向力加载模式的选择提供参考；通过了解结构构件破坏机制、结构局部与整体损伤的关系,从而进一步为新结构的设计或受损结构的加固提供有针对性的指导。
[Abstract]:The huge economic loss caused by earthquake disaster has prompted people to rethink the method of seismic design based on bearing capacity. In 1995, American scholars first put forward the idea of performance-based seismic design. Pushover analysis, as a simplified method for nonlinear analysis of structures, can be used to evaluate the performance of structures accurately and easily under certain conditions. It is widely used in seismic analysis and design of building structures. However, the traditional Pushover analysis usually uses a one-way loading process, loading step by step to achieve the target value of structural damage. But under the actual earthquake action, the structure is subjected to reciprocating force process, obviously the unidirectional loading mode can not accurately reflect the true stress characteristics of the structure and members under earthquake action. Moreover, different lateral load modes have great difference on the analysis results. Considering the shortcomings of the traditional Pushover analysis in unidirectional loading and horizontal lateral force distribution, a horizontal lateral force distribution model based on the displacement energy dissipation and reciprocating push-over analysis method is proposed in this paper. This horizontal lateral force distribution mode has achieved good results in structural performance design. By describing the characteristics of the energy input history of the structure and establishing a simplified model of the energy dissipation history of the structure deformation, the parameters of the history control for the reciprocating and pushing analysis of the structure are obtained, so as to realize the dual control of the maximum deformation and the cumulative energy consumption at the same time. The influence of energy dissipation history on structural damage is considered. In this paper, four kinds of lateral force loading modes, namely uniform distribution, inverted triangle distribution, parabola distribution and adaptive distribution with vibration mode, are analyzed, and compared with unidirectional push-over analysis and dynamic time-history analysis. The results show that the adaptive distribution mode of reciprocating and push-over analysis can accurately estimate the distribution of hinge mode, maximum interlayer displacement, cumulative hysteretic energy dissipation and hysteretic energy dissipation of the structure under earthquake action. The feasibility of reciprocating and pushing analysis under different lateral force loading modes and the selection of lateral force loading modes in Pushover analysis are provided. Through the understanding of the failure mechanism of structural members and the relationship between the local structure and the whole damage, further guidance is provided for the design of new structures or the reinforcement of damaged structures.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU375.4
，
本文编号：2406992
[Abstract]:The huge economic loss caused by earthquake disaster has prompted people to rethink the method of seismic design based on bearing capacity. In 1995, American scholars first put forward the idea of performance-based seismic design. Pushover analysis, as a simplified method for nonlinear analysis of structures, can be used to evaluate the performance of structures accurately and easily under certain conditions. It is widely used in seismic analysis and design of building structures. However, the traditional Pushover analysis usually uses a one-way loading process, loading step by step to achieve the target value of structural damage. But under the actual earthquake action, the structure is subjected to reciprocating force process, obviously the unidirectional loading mode can not accurately reflect the true stress characteristics of the structure and members under earthquake action. Moreover, different lateral load modes have great difference on the analysis results. Considering the shortcomings of the traditional Pushover analysis in unidirectional loading and horizontal lateral force distribution, a horizontal lateral force distribution model based on the displacement energy dissipation and reciprocating push-over analysis method is proposed in this paper. This horizontal lateral force distribution mode has achieved good results in structural performance design. By describing the characteristics of the energy input history of the structure and establishing a simplified model of the energy dissipation history of the structure deformation, the parameters of the history control for the reciprocating and pushing analysis of the structure are obtained, so as to realize the dual control of the maximum deformation and the cumulative energy consumption at the same time. The influence of energy dissipation history on structural damage is considered. In this paper, four kinds of lateral force loading modes, namely uniform distribution, inverted triangle distribution, parabola distribution and adaptive distribution with vibration mode, are analyzed, and compared with unidirectional push-over analysis and dynamic time-history analysis. The results show that the adaptive distribution mode of reciprocating and push-over analysis can accurately estimate the distribution of hinge mode, maximum interlayer displacement, cumulative hysteretic energy dissipation and hysteretic energy dissipation of the structure under earthquake action. The feasibility of reciprocating and pushing analysis under different lateral force loading modes and the selection of lateral force loading modes in Pushover analysis are provided. Through the understanding of the failure mechanism of structural members and the relationship between the local structure and the whole damage, further guidance is provided for the design of new structures or the reinforcement of damaged structures.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU375.4
，
本文编号：2406992
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