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（同濟(jì)大學(xué)建筑設(shè)計(jì)研究院（集團(tuán)）有限公司， 上海 200092）

［摘要］某辦公塔樓采用鋼筋混凝土核心筒-大懸挑結(jié)構(gòu)體系，塔樓3層的外圍框架柱缺失，導(dǎo)致4～13層核心筒外側(cè)均為懸挑結(jié)構(gòu)，最大懸挑尺寸為19.2m。采用鋼筋混凝土核心筒作為豎向抗側(cè)力體系，在4層和9層設(shè)置懸臂桁架與環(huán)帶桁架組成的懸挑轉(zhuǎn)換體系，將上部樓層荷載傳遞給核心筒。對(duì)結(jié)構(gòu)進(jìn)行了抗震性能化設(shè)計(jì)，對(duì)核心筒關(guān)鍵部位采取了設(shè)置鋼板、型鋼柱、型鋼梁等加強(qiáng)措施，大震動(dòng)力彈塑性時(shí)程分析結(jié)果表明核心筒具有優(yōu)良的抗震性能。對(duì)懸挑轉(zhuǎn)換體系進(jìn)行了專(zhuān)項(xiàng)分析，具體包括：核心筒環(huán)通鋼梁的設(shè)計(jì)；  樓板剛度對(duì)懸臂桁架、環(huán)帶桁架受力和變形的影響規(guī)律；對(duì)懸挑轉(zhuǎn)換部位樓板進(jìn)行應(yīng)力分析，并采取后澆帶和鋪設(shè)鋼板的措施；  大懸挑關(guān)鍵節(jié)點(diǎn)分析等。結(jié)果表明，懸挑轉(zhuǎn)換體系具有較高的安全儲(chǔ)備。并針對(duì)懸挑轉(zhuǎn)換結(jié)構(gòu)的特點(diǎn)，給出了可行的施工方案。

［關(guān)鍵詞］鋼筋混凝土核心筒-大懸挑結(jié)構(gòu)；  懸挑轉(zhuǎn)換體系；  懸臂桁架；  環(huán)帶桁架；  抗震性能化設(shè)計(jì)

中圖分類(lèi)號(hào)：TU398文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)17-0056-09

Structural design of an office tower with large cantilever

CHEN Xi

(Tongji Architectural Design (Group) Co., Ltd., Shanghai 200092, China)

Abstract:The reinforced concrete core tube-large cantilever structure system was adopted in an office tower, the external frame columns at the 3rd floor were absent, resulting the 4th to 13th floors outside the core tube are cantilevered structure, and the maximum cantilever size was 19.2m.The reinforced concrete core tube was adopted as the vertical lateral force resistance system, and cantilever truss and belt truss was set at the 4th and 9th floor, composed of cantilevered transfer system,transfering the load from the upper floor to the core tube. Performance-based seismic analysis of the structure was studied. Steel plates, steel columns, steel beams and other strengthening measures were adopted at the key parts of the core tube. The results of the dynamic elastic-plastic time-history analysis of the rare earthquake show that core tube has excellent seismic performance. Special analysis was conducted on the cantilevered transfer system, including the design of inner belt steel beam of core tube, the influencing rules of slab stiffness on the stress and deformation of the cantilever truss and belt truss, the stress analysis on key slabs in cantilever part, measures of post cast strip and laying steel plate were taken, key node analysis for large cantilever truss, et al. The above analysis results show that the cantilevered transfer system has a high safety storage to achieve its desired seismic performance goals. According to the characteristics of cantilever conversion structure, the feasible construction scheme is given.

Keywords:reinforced concrete core tube-large cantilever structure; cantilevered transfer system; cantilever truss; belt truss; performance-based seismic design

作者簡(jiǎn)介：陳曦，碩士，工程師，Email:545592473@qq.com。