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（中國建筑西北設(shè)計(jì)研究院有限公司， 西安 710018）
［摘要］中航國際航空城展示中心項(xiàng)目具有平面布置嚴(yán)重不規(guī)則，豎向多個(gè)超長穿層斜柱，樓板開巨洞，屋蓋大跨不規(guī)則、大懸挑且設(shè)停機(jī)坪等特點(diǎn)。主體采用鋼管混凝土柱鋼框架-屈曲約束支撐結(jié)構(gòu)體系，屋蓋采用網(wǎng)架以及平面主次桁架結(jié)構(gòu)體系。采用YJK，MIDAS/Gen，MIDAS/FEA等多個(gè)軟件對結(jié)構(gòu)進(jìn)行計(jì)算分析，在整體計(jì)算指標(biāo)滿足現(xiàn)行規(guī)范要求的基礎(chǔ)上，進(jìn)行了多遇地震、設(shè)防地震、罕遇地震作用下結(jié)構(gòu)構(gòu)件的承載力及變形能力驗(yàn)算，對屋蓋結(jié)構(gòu)以及超長穿層斜柱進(jìn)行屈曲分析及計(jì)算長度分析，對樓板薄弱部位、個(gè)別復(fù)雜節(jié)點(diǎn)進(jìn)行有限元分析。計(jì)算結(jié)果表明，通過設(shè)置屈曲約束支撐、嚴(yán)格控制結(jié)構(gòu)層間位移及超長斜柱的應(yīng)力比、樓板薄弱部位設(shè)斜撐加強(qiáng)等一系列措施后，結(jié)構(gòu)能夠滿足預(yù)期的抗震性能目標(biāo)要求。
［關(guān)鍵詞］鋼管混凝土柱鋼框架結(jié)構(gòu)； 屈曲約束支撐； 大跨不規(guī)則屋蓋； 性能目標(biāo)； 屈曲分析； 抗倒塌分析
中圖分類號：TU318文獻(xiàn)標(biāo)識(shí)碼：A文章編號：1002-848X(2017)01-0073-06
Structural design of a large-span and irregular steel structure in exhibition center of China International Airport City
Hu Peng， Cao Li， Xin Li， Zeng Fansheng， Zhang Hui， Zhang Mingxing
（China Northwest Building Design & Research Institute Co., Ltd., Xi′an 710018, China)
Abstract:The project of exhibition center of China International Airport City possesses the characteristics of sever irregular plan arrangement, multiple vertical super-long inclined columns crossing the floors, big-holes on the floor, large-span and irregular roof, large-cantilever structure and set of parking apron. The main structure adopts concrete-filled steel column steel frame structural system with buckling restrained braces and roof system adopts grids and spatial primary and secondary trusses. Various programs as YJK, MIDAS/Gen and MIDAS/FEA were used to calculate and analyze the structure. Based on whole calculation indicators meeting the current specification requirements, bearing capacity and deformation checking of structural members were conducted under earthquakes of the frequent earthquake, fortification earthquake and rare earthquake. The buckling analysis and calculation of length analysis were carried out on roof structure and super-long inclined columns crossing the floors. Finite element analysis was conducted on the weak parts of floor and the individual complex nodes. The calculation results show that through setting the buckling restrained braces, strictly controlling the structural layer displacement and stress ratio of super-long inclined columns, and setting diagonal braces to strengthen the weak parts of floor, the structure can meet requirements of the expected performance objective.
Keywords:concrete-steel column steel frame structure； buckling restrained brace； large-span and irregular roof； performance objective； buckling analysis； anti-collapse analysis
*中國建筑股份有限公司科技研發(fā)課題（CSCEC-2015-Z-41）。
作者簡介：扈鵬，碩士，一級注冊結(jié)構(gòu)工程師，Email:170435820@qq.com。
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