高层建筑混合结构基于变形的抗震性能研究

发布时间：2019-07-03 18:32

【摘要】：在高层建筑混合结构中，框架-核心筒结构是应用最多的一种结构类型。对于这种结构体系，国内外工程界尚存有争议，认为该体系的抗震性能主要取决于钢筋混凝土核心筒，它相对来说刚度有余而强度不足，而钢或型钢混凝土框架则正好相反，这使得混合结构在抗震性能上不协调，如何有效评估其抗震性能显得尤为重要。而我国规范并未给出此类体系整体结构和构件的变形性能的量化指标。因此，，研究采用变形指标来评估此类结构的抗震性能有着重要的现实意义。本文根据高层建筑混合结构的变形特点，将内核心筒结构层间位移分为受力层间位移和非受力层间位移，分析各竖向构件楼层处截面转角的变化规律，层间位移角和受力层间位移角沿层高的变化规律；在我国现行规范的基础上，定义混合结构和构件的性能水准及其划分方法，采用受力层间位移角和层间位移角作为混合结构整体变形的双重控制指标，采用塑性转角作为构件变形的控制指标，参考已有研究成果和统计大量剪力墙试验数据，对此类结构和剪力墙构件性能指标的量化进行研究，引用美国规范FEMA356对梁柱构件转角变形的规定，最终建立起一套分析混合结构及其构件抗震性能的变形指标体系；在上述基础上，通过三维结构非线性分析与性能评估软件Perform-3D，采用弹塑性时程分析方法从结构层面、构件层面依次采用层间位移角、构件转角变形指标对某实际高层混合结构进行结构及其构件的抗震性能分析和对比研究，结果表明从构件层面采用构件转角变形指标对结构进行抗震性能分析的效果优于从结构层面采用单一的层间位移角指标分析结构的抗震性能。本论文研究成果对工程实际有重要参考价值。
[Abstract]:Among the hybrid structures of high-rise buildings, frame-core tube structure is one of the most widely used structural types. For this kind of structural system, there is still controversy in the engineering field at home and abroad. It is considered that the seismic performance of the system mainly depends on the reinforced concrete core tube, which is relatively more than stiffness and insufficient strength, while the steel or steel reinforced concrete frame is just the opposite, which makes the seismic performance of the hybrid structure uncoordinated, so how to effectively evaluate its seismic performance is particularly important. However, the Chinese code does not give the quantitative index of the overall structure of this kind of system and the deformation performance of the components. Therefore, it is of great practical significance to use deformation index to evaluate the seismic performance of this kind of structure. According to the deformation characteristics of the mixed structure of high-rise building, the interstory displacement of the inner core tube structure is divided into the stress interstory displacement and the unloaded interstory displacement, and the variation law of the section rotation angle at the floor of each vertical member and the variation law of the interstory displacement angle and the stress interstory displacement angle along the height of the story are analyzed in this paper. On the basis of the current code of our country, the performance level and division method of hybrid structure and component are defined. The stress interstory displacement angle and interstory displacement angle are used as the double control index of the overall deformation of the hybrid structure, and the plastic rotation angle is used as the control index of component deformation. Referring to the existing research results and statistics, a large number of shear wall test data are used to quantify the performance index of this kind of structure and shear wall members. According to the American code FEMA356 on the angular deformation of beam-column members, a set of deformation index system for analyzing the seismic performance of hybrid structures and their members is established. On the basis of the above, through the three-dimensional structural nonlinear analysis and performance evaluation software Perform-3D, the elastic-plastic time history analysis method is used to analyze and compare the seismic performance of a practical high-rise hybrid structure and its members from the structural level, the member level adopts interstory displacement angle in turn, and the member rotation angle deformation index is used to analyze and compare the seismic performance of a practical high-rise hybrid structure. The results show that the seismic performance of the structure is better than that of the structure by using a single interstory displacement angle index from the structural level. The research results of this paper have important reference value to the engineering practice.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU973.31

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