雙塔裙房一體的大底盤變厚度筏形基礎(chǔ)變形特征
侯光瑜1，陳彬磊1，沈濱2，唐建華2
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(1 北京市建筑設(shè)計研究院，北京 100045； 2 北京市勘察設(shè)計研究院有限公司，北京 100038)［摘要］大底盤厚筏基礎(chǔ)是通過擴大的地下結(jié)構(gòu)，將地面上不同建筑單元連成一體的筏板基礎(chǔ)。通過北京LG大廈基礎(chǔ)設(shè)計、沉降觀測以及反演，分析了并列式雙塔裙房一體的大底盤變厚度筏形基礎(chǔ)的變形特征。此類基礎(chǔ)的縱向整體變形曲線雖呈連續(xù)的多波狀，但塔樓下基礎(chǔ)整體變形曲線仍呈盤狀，在形狀上與一般單幢建筑物并無差異。與塔樓連成一體的擴大了的地下結(jié)構(gòu)，在一定范圍內(nèi)具有分擔(dān)部分塔樓豎向荷載的能力，但也會引起基礎(chǔ)偏心使基礎(chǔ)出現(xiàn)整體傾斜。強調(diào)地下室框架結(jié)構(gòu)及樓板參與工作對減小塔樓下大底盤基礎(chǔ)的整體撓曲度有重要影響。［關(guān)鍵詞］大底盤厚筏基礎(chǔ)；并列雙塔；裙房；變形特征Deformation behavior of large plinth of raft foundation with variable thickness under twin towers with podium in parallelHou Guangyu1，Chen Binlei1，Shen Bin2，Tang Jianhua2(1 Beijing Institute of Architectural Design,Beijing 100045，China; 2 BGI Engineering Consultants Ltd.,Beijing 100038,China)Abstract:The large plinth of thick raft foundation refers to the raft foundation which links several separate architectural units above the ground as a whole by extended substructure.The deformation behavior of such a raft foundation is presented with variable thickness under twin towers with podium in parallel through the foundation design, settlement observation and back analysis of Beijing LG Building. The overall longitudinal deformation curve of such kind foundation is a multi-wave profile, but the deformation curve under the tower still emerges as sagging which has no difference with individual tower except the amount of settlement. The extended substructure that links the tower as a whole shares part of vertical loads of the tower within a certain range, but it could cause general incline due to foundation eccentricity. The study emphasizes the interaction of basement frame-structure，including the underground floor slab which has significant effects to minimize the deflection ratio of the large plinth of raft foundation under tower.Keywords:large plinth of thick raft foundation； twin towers in parallel； podium； deformation behavior作者簡介：侯光瑜，教授級高工，Email：hou1934@yahoo.cn。參考文獻(xiàn)［1］侯光瑜，陳彬磊，苗啟松，等. 鋼-混凝土組合框架-核心筒結(jié)構(gòu)設(shè)計研究［J］. 建筑結(jié)構(gòu)學(xué)報,2006，27(2):1-9.［2］北京市勘察設(shè)計研究院. 巖土勘察報告［R］.2001.［3］北京市勘察設(shè)計研究院. 北京LG大廈工程地基與基礎(chǔ)協(xié)同作用計算分析報告［R］.2001.［4］GB50007—2002建筑地基基礎(chǔ)設(shè)計規(guī)范［S］.北京：中國建筑工業(yè)出版社，2002.［5］中兵勘察設(shè)計研究院. 北京LG大廈沉降觀測報告［R］.2007.［6］黃熙齡.高層建筑厚筏反力及變形特征試驗研究［J］.巖土工程學(xué)報，2002,24(2):131-136.［7］宮劍飛，黃熙齡，滕延京，等. 多棟塔樓作用下大底盤框架厚筏基礎(chǔ)結(jié)構(gòu)分析與設(shè)計［R］.北京：中國建筑科學(xué)研究院，2004.［8］JGJ6—99高層建筑箱形與筏形基礎(chǔ)技術(shù)規(guī)范［S］.北京：中國建筑工業(yè)出版社，1999.
