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（浙江綠城建筑設(shè)計(jì)有限公司， 杭州 310007）

［摘要］大懸挑結(jié)構(gòu)因其跨度大、冗余度低常成為結(jié)構(gòu)設(shè)計(jì)的難點(diǎn)及重點(diǎn)。某商業(yè)綜合體懸挑結(jié)構(gòu)最大跨度27.7m，采用六榀鋼桁架作為主要受力構(gòu)件。通過(guò)加大樓板厚度、設(shè)置樓面水平斜撐等構(gòu)造措施，使結(jié)構(gòu)傳力可靠直接、變形協(xié)調(diào)合理。采用SAP2000等有限元軟件對(duì)結(jié)構(gòu)穩(wěn)定性、防連續(xù)性倒塌、樓板應(yīng)力、樓蓋舒適度、復(fù)雜節(jié)點(diǎn)應(yīng)力進(jìn)行分析。結(jié)果表明，本工程懸挑結(jié)構(gòu)滿(mǎn)足正常使用極限狀態(tài)及承載能力極限狀態(tài)要求。通過(guò)大震彈塑性時(shí)程分析，懸挑區(qū)域鋼結(jié)構(gòu)基本處于彈性階段，支承懸挑桁架的框架柱等關(guān)鍵構(gòu)件滿(mǎn)足結(jié)構(gòu)抗震性能化設(shè)計(jì)要求。

［關(guān)鍵詞］鋼桁架；大懸挑結(jié)構(gòu)；防連續(xù)性倒塌；舒適度；施工模擬；地鐵上蓋；彈塑性時(shí)程分析

中圖分類(lèi)號(hào)：TU393-3文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)07-0091-07

Design and analysis of large cantilevered structure of a commercial complex

YAO Kaiming, ZHAN Lebin, ZHU Qi, REN Guangyong, WU Yingdong, QI Xiangming

(Zhejiang Greenton Architectural Design Co., Ltd., Hangzhou 310007, China)

Abstract:Large cantilever structures is difficult and important in structure design due to the large span and low redundancy. The maximum span of the cantilever structure of a commercial complex is 27.7m, and six steel trusses are used as the main force member. Through structural measures such as increasing the thickness of the floor, setting up horizontal inclined braces, the force transmission of the structure is reliable and direct, and the deformation is coordinated and reasonable. Finite element softwares such as SAP2000 were used to analyze structural stability, anti-progressive collapse, floor stress, floor comfort, stress of complex nodes. The results show that the cantilever structure of the project meets the requirements of the serviceability limit state and the bearing capacity ultimate limit state. Through the analysis of elastic-plastic time history under rare earthquakes, the steel structure in the cantilever area is basically in the elastic stage. The key components such as frame columns supporting the cantilever trusses meet the requirements of performance-based seismic design.

Keywords:steel truss;large cantilevered structure;anti-progressive collapse;comfort;construction simulation;over-track building;elastic-plastic time history analysis

作者簡(jiǎn)介：姚開(kāi)明，碩士，高級(jí)工程師，一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email:yaokaiming@gad.com.cn。