高層建筑與地基共同作用筏板基礎(chǔ)破壞特征及影響因素理論研究
劉朋輝
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劉朋輝(中國建筑科學(xué)研究院地基基礎(chǔ)研究所， 北京 100013)[摘要] 根據(jù)已有的某獨特殼體大樓筏基的沉降、反力和內(nèi)力的實測結(jié)果，在更加深入分析的基礎(chǔ)上，指出該建筑由于局部差異沉降過大導(dǎo)致筏板基礎(chǔ)開裂，進(jìn)而引起沉降和基底反力的調(diào)整及鋼筋應(yīng)力的突變。然后利用上部結(jié)構(gòu)、地基與基礎(chǔ)共同工作的計算方法，考慮結(jié)構(gòu)剛度和荷載擴(kuò)散、筏板厚度、筏板彈性模量和筏板外挑長度對筏基變形和基底反力的影響，對筏板開裂的原因進(jìn)行了一定的解釋。最后指出設(shè)計時應(yīng)重點考慮不同部位的局部撓曲對筏板基礎(chǔ)造成的影響、底層柱軸力分布規(guī)律及筏板外挑長度的限制。[關(guān)鍵詞] 筏基；整體彎矩；共同作用；差異沉降中圖分類號：TU560.30 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2012)12-0131-04Failure characteristics and theoretical analysis for raft foundation with super structure\|foundationsoil interactionLiu Penghui(Institute of Soil and Foundation, China Academy of Building Research, Beijing 100013, China)Abstract: The vertical settlements, contact pressures and stresses in the steel of the raft foundation were measured during the construction of a building. The measurements were deeper analyzed to explain that the differential settlements caused the cracking of the raft foundation, the adjustment of vertical settlements, the adjustment of contact pressures and the abrupt changes of the stresses in the steel. The interaction method of super structure\|foundation\|soil was used to analyze the stiffness of the superstructure , load distribution of the column, the thickness of the taft foundation, the elasticity modulus of the taft foundation and the elongation of the raft foundation. The reasons of the cracking were explained. Finally it is pointed out that the partial moment, the distribution of bottom column axial force and the elongation of the raft foundation have important effect on the raft foundation.Keywords: mat foundation; integral moment; interaction; differential settlement作者簡介：劉朋輝，博士研究生，Email：liuph1234@126.com參考文獻(xiàn)［1］王濤, 劉金礪. 樁基變剛度調(diào)平設(shè)計的實施方法研究［J］. 巖土工程學(xué)報，2010,32（4）：531-537.［2］中國建筑科學(xué)研究院地基所，中國建筑北京設(shè)計研究院，中國電子工程設(shè)計院，等. 整體大面積筏板基礎(chǔ)地基反力原位測試分析及筏板彎矩設(shè)計［R］. 北京, 2010.［3］FOCHT J A, KHAN F R, GEMEINHARDT J P. Performance of one shell plaza deep mat foundation［J］. Journal of the Geotechnical Engineering, 1978,104（5）: 593-608.［4］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.［5］董建國, 趙錫宏. 高層建筑地基基礎(chǔ)-共同作用的理論與實踐［M］. 上海：同濟(jì)大學(xué)出版社，1997.［6］貢金鑫，魏巍巍，胡家順. 中美歐混凝土結(jié)構(gòu)設(shè)計［M］. 北京：中國建筑工業(yè)出版社，2007.［7］ACI 318-08 Building code requirements for structural concrete and commentary ［S］. ACI Committee Institute, Farmington Hills, Mich，2008.［8］錢力航主編. 高層建筑箱形與筏形基礎(chǔ)的設(shè)計計算［M］. 北京：中國建筑工業(yè)出版社，2003.
