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（啟迪設(shè)計(jì)集團(tuán)股份有限公司， 蘇州 215021）

［摘要］結(jié)合實(shí)際工程，介紹了超長(zhǎng)混凝土結(jié)構(gòu)考慮混凝土收縮、徐變影響下等效溫差的計(jì)算方法，進(jìn)行了樁基剛度的計(jì)算。建立基礎(chǔ)無(wú)限剛和基礎(chǔ)有限剛對(duì)比分析模型，在僅溫度作用、恒載+活載+溫度作用兩種工況下，對(duì)超長(zhǎng)混凝土結(jié)構(gòu)溫度應(yīng)力分別進(jìn)行了計(jì)算分析。結(jié)果表明，在考慮混凝土收縮、徐變影響時(shí)，在設(shè)定位置處基礎(chǔ)有限剛模型計(jì)算所得的上部結(jié)構(gòu)溫度應(yīng)力小于基礎(chǔ)無(wú)限剛模型?？紤]基礎(chǔ)對(duì)上部結(jié)構(gòu)真實(shí)的約束剛度，能夠得到真實(shí)的溫度應(yīng)力。

［關(guān)鍵詞］超長(zhǎng)混凝土結(jié)構(gòu)； 溫度應(yīng)力； 等效溫差； 樁基剛度

中圖分類(lèi)號(hào)：TU375文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2017)20-0073-05

Influence of piled foundation stiffness on temperature stress of super-long concrete structure

Zhang Min, Zhu Yi, Wei Xiang, Zhu Liming

(Tus-Design Group Co., Ltd., Suzhou 215021, China)

Abstract:Based on the actual project, the calculation method of the equivalent temperature difference of super-long concrete structure under the influences of concrete shrinkage and creep was introduced, and the calculation of the stiffness of piled foundation was carried out. Based on the contrast analysis models of the infinite rigid foundation and the finite rigid foundation, the temperature stress of the super-long concrete structure was calculated and analyzed respectively under the two working conditions of temperature action and dead loads+live loads+temperature action. The results show that under the influence of concrete shrinkage and creep, the temperature stress of the upper structure model with finite rigid foundation in corresponding parts is less than that of the structure model with infinite rigid foundation. Considering the real constraint stiffness of the upper structure by foundation, the true temperature stress can be obtained.

Keywords:super-long concrete structure; temperature stress; equivalent temperature difference; stiffness of piled foundation

作者簡(jiǎn)介：張敏，學(xué)士，教授級(jí)高級(jí)工程師，一級(jí)注冊(cè)結(jié)構(gòu)工程師，總工程師，Email:min.zhang@siad-c.com。