地震作用下结构扭转效应影响因素的分析研究

发布时间：2018-12-15 04:45

【摘要】：通过分析国内外的多次地震我们发现,结构在地震作用下不只发生水平和竖直方向的振动,扭转振动也同时产生,而地震下的扭转反应是引起结构抗震性能退化、导致结构损坏乃至倒塌的重要原因。由于土地资源的稀缺、建筑功能的多元化,建筑师们不再满足于简单的外观,因此超限高层变得越来越普遍、结构形式越来越复杂,不规则结构的出现难以避免。鉴于扭转破坏的严重性,对地震作用下结构扭转效应的影响因素进行分析研究并在设计过程中进行合理控制是十分必要的。本文通过对刚心和质心不重合的单层和多层偏心结构进行结构分析,重点分析了框架结构、框架剪力墙结构扭转效应的影响因素,并通过超限工程实例重点论述了控制结构扭转效应的方法,对比了不同调整方案的合理性和可行性,主要做了以下几方面工作:(1)建立多个单层偏心框架结构和框筒结构模型,对周期比、位移比与偏心率的关系进行分析;采用剪力比值作为评价结构扭转效应的参数,建立多个单层的偏心框架结构和框剪结构模型,对偏心率和剪力比值的关系进行分析。发现随着结构质心和刚心偏离程度的增大,周期比反常减小,但结构的扭转效应有增大趋势。(2)建立多个多层的偏心框架结构模型,对结构的周期比、位移比与偏心率的关系进行分析,同时对周期比与建筑高度间的关系做了分析;采用楼层位移比值作为评价结构整体扭转效应的指标,对结构长宽比、偏心方向与结构扭转效应的关系进行分析。结果显示,长宽比、偏心方向、建筑高度均对结构扭转效应有显著影响。(3)针对超限工程实例,根据上述研究成果,调整模型给出多个不同控制结构扭转效应的方案,并对比小震下包括周期比和位移比在内的参数的变化情况,综合评价结构的抗震性能,同时比较不同方案下中震墙肢抗拉性能和大震下的层间位移角。本文分析了结构扭转效应的影响因素,并通过在工程实例的具体应用,旨在对今后的研究和设计工作提供一定的参考价值。
[Abstract]:Through the analysis of many earthquakes at home and abroad, we find that not only horizontal and vertical vibration occurs, but also torsional vibration occurs under earthquake, and the torsional response under earthquake results in the degradation of seismic performance of the structure. The main causes of structural damage and even collapse. Due to the scarcity of land resources and the diversification of architectural functions, architects are no longer satisfied with the simple appearance, so the over-limited high-rise has become more and more common, the structural forms are becoming more and more complex, and the appearance of irregular structures is difficult to avoid. In view of the severity of torsional failure, it is necessary to analyze and study the factors affecting the torsional effect of structures under earthquake and to control it reasonably in the design process. Based on the structural analysis of single-layer and multi-story eccentricity structures with incongruous center of mass and rigid center, the factors affecting torsional effect of frame structure and frame shear wall structure are analyzed in this paper. The method of controlling the torsional effect of the structure is discussed through the example of the over-limit engineering, and the rationality and feasibility of the different adjustment schemes are compared. The main works are as follows: (1) to establish several single-layer eccentric frame structures and frame-tube structure models, and analyze the relationship between period ratio, displacement ratio and eccentricity; The shear ratio is used as a parameter to evaluate the torsional effect of a structure, and several single-layer eccentric frame structures and frame-shear structure models are established, and the relationship between eccentricity and shear ratio is analyzed. It is found that the periodic ratio decreases with the increase of the deviation degree of the center of mass and the rigid center, but the torsional effect of the structure tends to increase. (2) several multi-story eccentric frame structure models are established, and the periodic ratio of the structure is obtained. The relationship between displacement ratio and eccentricity is analyzed, and the relationship between period ratio and building height is also analyzed. The ratio of floor displacement is used as the index to evaluate the overall torsional effect of the structure. The relationship between the ratio of length to width, the eccentric direction and the torsional effect of the structure is analyzed. The results show that the ratio of length to width, eccentric direction and building height have significant effects on the torsional effect of the structure. (3) according to the above research results, the adjustment model gives several schemes to control the torsional effect of the structure. By comparing the variation of the parameters including period ratio and displacement ratio under small earthquake, the seismic performance of the structure is evaluated synthetically, and the tensile behavior of the middle earthquake wall limb and the interstory displacement angle under the strong earthquake are compared at the same time. In this paper, the factors influencing the torsional effect of structures are analyzed, and through the concrete application in engineering examples, the paper aims to provide some reference value for the future research and design work.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU311.3

【参考文献】