- 摘 要
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(北京市建筑設(shè)計研究院有限公司， 北京 100045)
［摘要］巨型斜撐框架結(jié)構(gòu)是超高層建筑高效的抗側(cè)力體系之一。巨型斜撐作為關(guān)鍵構(gòu)件可顯著提高外框筒剛度，二道抗震防線作用顯著。通過對比深圳平安金融中心、天津高銀117大廈、沈陽寶能金融中心T1塔樓和中信大廈四棟建筑高度500m以上超高層巨型斜撐的設(shè)計，從巨型斜撐的布置形式、與次框架的關(guān)系、計算長度以及關(guān)鍵節(jié)點設(shè)計等方面對四棟建筑進行了對比分析。結(jié)果表明，由于單斜撐的非對稱性，會使結(jié)構(gòu)產(chǎn)生X向和Y向的耦合平動，改變最不利地震作用方向。巨型斜撐與次框架的連接主要改變傳力路徑。樓板對巨型斜撐的約束作用顯著，在確定巨型斜撐的計算長度時，應(yīng)考慮樓板的側(cè)向約束。在軸力作用下，巨型斜撐節(jié)點的不對稱加腋會增大板件應(yīng)力，設(shè)計中宜避免。
［關(guān)鍵詞］超高層建筑；巨型斜撐；計算長度；節(jié)點
中圖分類號：TU318+.2,TU973+.31 文獻標識碼：A文章編號：1002-848X(2021)19-0106-05
Comparison of the design of mega braces in super high-rise buildings
GONG Zhenchao
(Beijing Institute of Architectural Design, Beijing 100045， China)
Abstract: Mega braced frame structure is one of the highly efficient lateral force resisting systems for super high-rise buildings. As key component, mega braces can significantly improve stiffness of outer frame tube, and the second line of seismic defense effect is significant. By comparing the super high-rise mega braces design of 4 towers over 500m height, such as Shenzhen Pingan Financial Center, Tianjin Goldin 117 Tower, Shenyang Baoneng Financial Hub T1 tower and CITIC Tower, the four buildings were compared and analyzed from the layout form of the mega braces, the relationship with the secondary frame, the calculated length and the design of the key joints. The results show that due to the asymmetry of the single diagonal brace, the structure will produce coupled translational motions in the X and Y directions, and the most unfavorable seismic direction is changed. The connection between the mega brace and the sub-frame is mainly the change of the force transmission path. The floor slab has a significant restraint effect on the mega brace. When determining the calculated length of the mega brace, the lateral restraint of the floor slab should be considered. Under the action of axial force, the asymmetric haunch of the mega brace joint will increase the stress of the plate, which should be avoided in the design.
Keywords:super high-rise building； mega brace； calculated length； joint
作者簡介：宮貞超，碩士，高級工程師，一級注冊結(jié)構(gòu)工程師，Email：zcgong369@126.com。
