考虑填充墙作用的RC框架结构非线性地震损伤分析
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摘要
填充墙RC框架结构由于具有良好的抗震性能,因此在历次地震中有着良好的表现。随着研究的深入和震害资料的增多,研究人员发现：尽管填充墙作为一种非结构构件,它却在地震作用下遭到了较严重的破坏。于是研究人员开始重视填充墙对结构抗震性能产生的影响。目前我国的建筑抗震设计方法仅采用周期折减系数来考虑填充墙对结构的影响,不能直接反映填充墙对结构的优劣性。针对目前建筑的多功能化,填充墙的布置方式往往灵活多变,造成了其布置方式不规则。然而国内外学者对这方面的研究还相对较少,并且我国的抗震规范也没有针对填充墙不规则布置对结构产生的影响作明确规定。因此研究填充墙不规则布置对RC框架结构抗震性能的影响是非常有必要的。
建筑物在地震作用下,结构和构件均受到不同程度的影响,造成结构的承载力下降、耐久性降低和抗震性能的退化,即产生了一定程度的损伤。结构吸收地震能量的能力和弹塑性变形能力决定了结构抗震性能.的高低,而这些能力的实现却是以结构产生损伤为代价的。在基于性能的抗震设计方法基础上,结合损伤力学理论,能够建立起基于损伤性能的抗震设计和评估方法。通过计算损伤指数可以直观地反映结构和构件在地震作用下的损伤情况。
本文在国内外学者对填充墙的研究基础上,引入损伤力学理论,旨在研究在非线性地震作用下,填充墙不规则布置对结构的影响。基于我国现行抗震设计规范的基础上,选取6种典型的填充墙竖向布置方式的RC框架结构,讨论了EL Centro波、汶川卧龙波以及白噪声波三个地震波分别在多遇、设防和罕遇地震作用下填充墙对结构抗震性能、滞回耗能以及损伤性能的影响。研究结果表明,填充墙不同的布置方式改变了结构的竖向刚度分布和RC框架的受力模式,对结构的抗震性能、滞回耗能性能以及损伤性能均产生了不同的影响。特别是填充墙不规则的布置方式会导致结构薄弱层的形成和改变,使得结构不能按照设计预想的模式下发生破坏。最后本文从结构设计、施工、装修以及物业管理等多方面给出了相关的建议。
The infilled walls RC frame structure has good performance in previous earthquakes due to its good seismic performance. With the development of research and the increase of seismic data, researchers found that infilled walls, although as nonstructural components, suffered serious damage in the earthquake. Therefore researchers pay more attention on the infilled walls'influence on structure seismic performance. At present only the cycle reduction factor has been adopted in the building seismic design method to consider the influence of infilled walls on structure, but it can't directly reflect the infilled walls'inferiority on structure. In view of the multi-function of building, the arrangement of infilled walls is always flexible and changeable, which cause the arrangement means irregular. However the research of this aspect in domestic and overseas scholars is still relatively less and the influence of infilled walls'irregular arrangement on structure has not been explicitly stipulated in seismic codes in our country. Therefore it is very necessary to research the influence that infilled walls'irregular arrangement played on the RC frame structure seismic performance.
In earthquake, structure and component are suffered somewhat impacts, which make the carrying capacity of structure decrease, durability reduce and seismic performance degenerate, which produce a certain degree of damage. The level of structure seismic performance is decided by the ability of structure absorbing seismic energy and the ability of elastic-plastic deformation, and these abilities are realized at the expense of structure's damage. The seismic design and assessment method on the basis of damage performance are built on the basis of the seismic design method of performance and combined with damage mechanics theory. The damage of structure and component in earthquake can be reflected intuitively through computing damage index.
In this article, on the basis of domestic and overseas scholars'research on infilled walls, the damage mechanics theory is employed to make research on the influence that the irregular arrangement of infilled walls plays on the structure in the effect of nonlinear earthquake. On the basis of present code of seismic design, six kinds of typical RC frame structures, in which infilled walls are in vertical arrangement mode are selected and it has been discussed that the three seismic waves, EL Centro seismic wave, Wenchuan wolong seismic wave and white moise wave in the frequent earthquake, earthquake resistance and rare earthquake, the influence that infilled walls played on structure seismic performance, hysteretic energy and damage performance. Research shows that different arrangement of infilled walls changes structure vertical stiffness distribution and RC frame's stress pattern and have different influence on seismic performance, hysteretic energy performance and damage performance. What's more, the irregular arrangement of infilled walls will lead to the formation and change of structure frail-layer, which make the structure damaged not according to the pattern designed. Finally, relevant suggestions have been given from the aspects of structure design, construction, decoration and property management.
建筑物在地震作用下,结构和构件均受到不同程度的影响,造成结构的承载力下降、耐久性降低和抗震性能的退化,即产生了一定程度的损伤。结构吸收地震能量的能力和弹塑性变形能力决定了结构抗震性能.的高低,而这些能力的实现却是以结构产生损伤为代价的。在基于性能的抗震设计方法基础上,结合损伤力学理论,能够建立起基于损伤性能的抗震设计和评估方法。通过计算损伤指数可以直观地反映结构和构件在地震作用下的损伤情况。
本文在国内外学者对填充墙的研究基础上,引入损伤力学理论,旨在研究在非线性地震作用下,填充墙不规则布置对结构的影响。基于我国现行抗震设计规范的基础上,选取6种典型的填充墙竖向布置方式的RC框架结构,讨论了EL Centro波、汶川卧龙波以及白噪声波三个地震波分别在多遇、设防和罕遇地震作用下填充墙对结构抗震性能、滞回耗能以及损伤性能的影响。研究结果表明,填充墙不同的布置方式改变了结构的竖向刚度分布和RC框架的受力模式,对结构的抗震性能、滞回耗能性能以及损伤性能均产生了不同的影响。特别是填充墙不规则的布置方式会导致结构薄弱层的形成和改变,使得结构不能按照设计预想的模式下发生破坏。最后本文从结构设计、施工、装修以及物业管理等多方面给出了相关的建议。
The infilled walls RC frame structure has good performance in previous earthquakes due to its good seismic performance. With the development of research and the increase of seismic data, researchers found that infilled walls, although as nonstructural components, suffered serious damage in the earthquake. Therefore researchers pay more attention on the infilled walls'influence on structure seismic performance. At present only the cycle reduction factor has been adopted in the building seismic design method to consider the influence of infilled walls on structure, but it can't directly reflect the infilled walls'inferiority on structure. In view of the multi-function of building, the arrangement of infilled walls is always flexible and changeable, which cause the arrangement means irregular. However the research of this aspect in domestic and overseas scholars is still relatively less and the influence of infilled walls'irregular arrangement on structure has not been explicitly stipulated in seismic codes in our country. Therefore it is very necessary to research the influence that infilled walls'irregular arrangement played on the RC frame structure seismic performance.
In earthquake, structure and component are suffered somewhat impacts, which make the carrying capacity of structure decrease, durability reduce and seismic performance degenerate, which produce a certain degree of damage. The level of structure seismic performance is decided by the ability of structure absorbing seismic energy and the ability of elastic-plastic deformation, and these abilities are realized at the expense of structure's damage. The seismic design and assessment method on the basis of damage performance are built on the basis of the seismic design method of performance and combined with damage mechanics theory. The damage of structure and component in earthquake can be reflected intuitively through computing damage index.
In this article, on the basis of domestic and overseas scholars'research on infilled walls, the damage mechanics theory is employed to make research on the influence that the irregular arrangement of infilled walls plays on the structure in the effect of nonlinear earthquake. On the basis of present code of seismic design, six kinds of typical RC frame structures, in which infilled walls are in vertical arrangement mode are selected and it has been discussed that the three seismic waves, EL Centro seismic wave, Wenchuan wolong seismic wave and white moise wave in the frequent earthquake, earthquake resistance and rare earthquake, the influence that infilled walls played on structure seismic performance, hysteretic energy and damage performance. Research shows that different arrangement of infilled walls changes structure vertical stiffness distribution and RC frame's stress pattern and have different influence on seismic performance, hysteretic energy performance and damage performance. What's more, the irregular arrangement of infilled walls will lead to the formation and change of structure frail-layer, which make the structure damaged not according to the pattern designed. Finally, relevant suggestions have been given from the aspects of structure design, construction, decoration and property management.
引文
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