【摘要】：傳統(tǒng)的中心支撐框架體系是常用的水平抗側(cè)力體系,這種體系既經(jīng)濟(jì)又具有較高的強(qiáng)度和較大的剛度。然而,傳統(tǒng)的中心支撐體系在支撐屈服和結(jié)構(gòu)破壞之前的延性很有限,在地震作用下,結(jié)構(gòu)通常會(huì)產(chǎn)生殘余變形。針對(duì)傳統(tǒng)支撐鋼框架屈服前剛度較大,變形能力有限,屈服后剛度下降過快、殘余變形過大的缺點(diǎn),近年來一種自復(fù)位結(jié)構(gòu)得以發(fā)展,成為了研究熱點(diǎn)—自復(fù)位中心支撐框架體系。該體系能抵抗地震荷載的作用,使結(jié)構(gòu)免于破壞和產(chǎn)生殘余變形。通過柱腳細(xì)部構(gòu)造,自復(fù)位中心支撐框架體系可以允許柱在一定的水平力下消壓、脫開抬升,使結(jié)構(gòu)開始搖擺。垂直布置的預(yù)應(yīng)力筋給結(jié)構(gòu)提供了恢復(fù)力。由于該恢復(fù)力的存在,結(jié)構(gòu)具有自復(fù)位行為,進(jìn)而減小結(jié)構(gòu)產(chǎn)生殘余變形的可能性。本文簡(jiǎn)要地闡述了自復(fù)位中心支撐結(jié)構(gòu)體系的性能,識(shí)別了其初始的四個(gè)極限狀態(tài):柱腳消壓抬升、預(yù)應(yīng)力筋屈服、構(gòu)件屈服、構(gòu)件失效,并介紹了四個(gè)極限狀態(tài)的力學(xué)性能;根據(jù)國內(nèi)外基于性能的設(shè)計(jì)理論,確定了自復(fù)位中心支撐鋼框架結(jié)構(gòu)的性能水準(zhǔn)和性能目標(biāo),探討了自復(fù)位中心支撐鋼框架結(jié)構(gòu)基于性能的抗震設(shè)計(jì)與評(píng)估方法,并通過算例驗(yàn)證了該方法的可行性;采用有限元軟件SAP2000對(duì)12層傳統(tǒng)中心支撐鋼框架結(jié)構(gòu)和自復(fù)位中心支撐鋼框架結(jié)構(gòu)建模分析,對(duì)這兩種結(jié)構(gòu)進(jìn)行了靜力非線性分析和彈塑性動(dòng)力時(shí)程分析,并評(píng)估其抗震性能。研究結(jié)果表明,與傳統(tǒng)的中心支撐鋼框架結(jié)構(gòu)相比,自復(fù)位中心支撐鋼框架結(jié)構(gòu)具有更好的抗震性能;在強(qiáng)震作用下,自復(fù)位中心支撐鋼框架結(jié)構(gòu)的殘余變形更小,甚至沒有;其位移和基底剪力響應(yīng)都比傳統(tǒng)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.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU391;TU352.11

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