自复位中心支撑钢框架结构基于性能的抗震设计方法研究

发布时间：2018-09-11 14:18

【摘要】：传统的中心支撑框架体系是常用的水平抗侧力体系,这种体系既经济又具有较高的强度和较大的刚度。然而,传统的中心支撑体系在支撑屈服和结构破坏之前的延性很有限,在地震作用下,结构通常会产生残余变形。针对传统支撑钢框架屈服前刚度较大,变形能力有限,屈服后刚度下降过快、残余变形过大的缺点,近年来一种自复位结构得以发展,成为了研究热点—自复位中心支撑框架体系。该体系能抵抗地震荷载的作用,使结构免于破坏和产生残余变形。通过柱脚细部构造,自复位中心支撑框架体系可以允许柱在一定的水平力下消压、脱开抬升,使结构开始摇摆。垂直布置的预应力筋给结构提供了恢复力。由于该恢复力的存在,结构具有自复位行为,进而减小结构产生残余变形的可能性。本文简要地阐述了自复位中心支撑结构体系的性能,识别了其初始的四个极限状态:柱脚消压抬升、预应力筋屈服、构件屈服、构件失效,并介绍了四个极限状态的力学性能;根据国内外基于性能的设计理论,确定了自复位中心支撑钢框架结构的性能水准和性能目标,探讨了自复位中心支撑钢框架结构基于性能的抗震设计与评估方法,并通过算例验证了该方法的可行性;采用有限元软件SAP2000对12层传统中心支撑钢框架结构和自复位中心支撑钢框架结构建模分析,对这两种结构进行了静力非线性分析和弹塑性动力时程分析,并评估其抗震性能。研究结果表明,与传统的中心支撑钢框架结构相比,自复位中心支撑钢框架结构具有更好的抗震性能;在强震作用下,自复位中心支撑钢框架结构的残余变形更小,甚至没有;其位移和基底剪力响应都比传统的小。
[Abstract]:The traditional center-braced frame system is a commonly used horizontal anti-lateral force system, which is economical, has high strength and high stiffness. However, the ductility of traditional center-braced systems is very limited before bracing yield and structural failure. Under earthquake, residual deformation is usually produced. In view of the shortcomings of traditional braced steel frame, such as large stiffness before yield, limited deformation capacity, too fast reduction of stiffness after yielding and too large residual deformation, a self-reset structure has been developed in recent years. It has become a research hotspot-self-reset center support frame system. The system can resist the action of earthquake load and prevent the structure from damage and residual deformation. Through the detailed structure of the column foot, the self-reset center braced frame system can allow the column to remove and lift under a certain horizontal force, and make the structure start to swing. The vertical prestressing tendons provide the restoring force to the structure. Due to the existence of the restoring force, the structure has self-reset behavior, thus reducing the possibility of residual deformation of the structure. In this paper, the performance of the self-reset center braced structure system is briefly described, and the initial four limit states are identified: column foot lifting, prestressed tendons yielding, member failure, and the mechanical properties of the four limit states are introduced. According to the performance-based design theory at home and abroad, the performance level and performance target of steel frame structure with self-reset center bracing are determined, and the performance-based seismic design and evaluation method of steel frame structure with self-reset center bracing are discussed. The feasibility of the method is verified by an example, and the modeling and analysis of 12-story traditional center-braced steel frame structure and self-reset center-braced steel frame structure are carried out by using finite element software SAP2000. The static nonlinear analysis and elastoplastic dynamic time history analysis of the two structures are carried out, and their seismic performance is evaluated. The results show that, compared with the traditional steel frame structure with center bracing, the self-reset center braced steel frame structure has better seismic performance, and the residual deformation of the steel frame structure with self-reset center bracing is smaller or not under the action of strong earthquake. Both the displacement and the shear response of the base are smaller than those of the traditional one.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU391;TU352.11

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