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（香港華藝設(shè)計(jì)顧問（深圳）有限公司， 深圳 518026）
［摘要］以一種特殊體型大跨度長懸臂新型結(jié)構(gòu)體系作為研究對(duì)象，對(duì)其結(jié)構(gòu)體系選型的合理性進(jìn)行討論，確定抗震性能目標(biāo)并進(jìn)行詳細(xì)的計(jì)算分析。計(jì)算分析表明，結(jié)構(gòu)體系成立的關(guān)鍵環(huán)節(jié)是在底部樓層設(shè)置受力合理的鋼筋混凝土筒體，筒體不但能起到支承大跨度和長懸臂樓層的作用，而且可發(fā)揮強(qiáng)大的抗側(cè)、抗扭剛度和雙向受力的力學(xué)特征。創(chuàng)新地提出增設(shè)2榀支撐鋼桁架，為位于邊跨的鋼桁架提供可靠支座，以實(shí)現(xiàn)底部樓層寬度小于上部樓層寬度的建筑方案造型。對(duì)樓板應(yīng)力集中區(qū)域采用后澆的施工措施降低樓板應(yīng)力。鋼桁架支座節(jié)點(diǎn)有限元計(jì)算分析中揭示的應(yīng)力集中可通過局部加腋方式予以解決，對(duì)中震偏拉墻肢須予以針對(duì)性地加強(qiáng)。大震動(dòng)力彈塑性分析結(jié)果驗(yàn)證了結(jié)構(gòu)概念設(shè)計(jì)的合理性，各項(xiàng)指標(biāo)均能滿足性能目標(biāo)要求。
［關(guān)鍵詞］鋼桁架； 長懸臂； 鋼筋混凝土筒體； 應(yīng)力集中； 偏心受拉
中圖分類號(hào)：TU318文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2017)21-0001-06
Discussion on innovation and design of large-span & long-cantilever new structural system with special shape
Zhang Wei, Zhou Jianrong, Xu Jing, Liu Jun, Gao Yiqi
(Hong Kong Huayi Design & Consultant Co., Ltd., Shenzhen 518026， China)
Abstract:A new type of large-span & long-cantilever structure with special shape was studied. The rationality of the structural system selection was analyzed, and seismic performance objectives were identified and analyzed in detail. The calculation and analysis show that the key link of the structural system is setting the reasonably mechanical reinforced concrete tube at the bottom floor, because the tube can play the role of supporting large-span and long-cantilever floor, but also exert its strong lateral, torsional stiffness and two-way mechanical characteristics. Two additional pieces of supporting steel truss in the tube were proposed, which provide reliable support for the side span steel truss, to realize the building elevation scheme of the bottom floor width less than the width of the upper floor. The post pouring construction measures were adopted to reduce the floor stress in the stress concentration area of the floor. The stress concentration issue in the finite element analysis of the steel truss support joints could be solved by the method of setting local haunch. Under fortification earthquakes, the eccentric wall of the earthquake should be strengtheed. The rationality of structural conceptual design was verified by the dynamic elastic-plastic analysis under rare earthquakes, and all indicators could meet the performance requirements.
Keywords:steel truss; long cantilever; reinforced concrete tube; stress concentration; eccentric tension
作者簡介：張偉，碩士，高級(jí)工程師，一級(jí)注冊結(jié)構(gòu)工程師，Email:593225626@qq.com。
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