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(1 中國(guó)建筑科學(xué)研究院有限公司， 北京 100013；2 中國(guó)建筑技術(shù)集團(tuán)有限公司， 北京 100013；3 中南建筑設(shè)計(jì)院股份有限公司， 武漢 430071；4 北京交通大學(xué)土木建筑工程學(xué)院， 北京 100044)

［摘要］溫度變化對(duì)超長(zhǎng)混凝土結(jié)構(gòu)的變形和內(nèi)力存在較大的影響。結(jié)合魯南高鐵臨沂北站站前廣場(chǎng)項(xiàng)目，介紹了超長(zhǎng)混凝土結(jié)構(gòu)使用階段溫度應(yīng)力的等效溫差計(jì)算方法。利用有限元軟件分析了降溫溫差作用下的結(jié)構(gòu)內(nèi)力，探討了溫度變化對(duì)超長(zhǎng)混凝土結(jié)構(gòu)的影響。根據(jù)計(jì)算結(jié)果及其結(jié)構(gòu)特點(diǎn)，特選用緩粘結(jié)預(yù)應(yīng)力技術(shù)控制溫度裂縫，同時(shí)介紹了本項(xiàng)目其他抵抗溫度應(yīng)力的措施。結(jié)果表明：在使用階段，隨著結(jié)構(gòu)降溫溫差的增大，超長(zhǎng)結(jié)構(gòu)最大溫度應(yīng)力呈線性增長(zhǎng)。控制后澆帶閉合時(shí)間和施加預(yù)應(yīng)力是有效控制溫度應(yīng)力的方法。 

［關(guān)鍵詞］超長(zhǎng)混凝土結(jié)構(gòu)；溫度應(yīng)力；緩粘結(jié)預(yù)應(yīng)力；裂縫控制 

中圖分類號(hào)：TU378 文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)14-0107-05

Crack control of super-long concrete structures under temperature stress in use stage 

JIANG  Fangxin1,2 ,  CHEN  Shangzhi1,2 ,  SHAO  Xingyu3 ,  YAO  Zhangting1,2 ,  LIU  Yun1,2 ,  ZHENG  Tiancheng4 

(1 China Academy of Building Research, Beijing 100013，China；2 China Building Technique Group Co., Ltd., Beijing 100013，China；3 Central-South Architectural Design Institute Co., Ltd., Wuhan 430071，China；4 School of Civil Engineering，Beijing Jiaotong University, Beijing 100044， China) 

Abstract: Temperature changes have a great influence on the deformation and internal forces of super-long concrete structures. Based on the Linyi North Station square project of Lunan high-speed railway, a calculation method about equivalent temperature variation of the temperture stress in the use stage of super-long concrete structure was introduced. The finite element software was used to analyze the internal force of the structure under the action of temperature drop and to discuss the influence of temperature change on the super-long concrete structure. According to the calculation results and its structural characteristics, the retard-bonded prestress technology was used to control the temperture cracks. In addition, other measures to resist the temperature stress of the project were introduced. The results show that during the use stage, as the temperature drop of the structure increases, the maximum temperature stress of the super-long structure increases linearly. Controlling the closing time of post-cast strip and applying prestress are effective methods to control temperature stress. 

Keywords:super-long concrete structure； temperature stress； retard-bonded prestress； crack control

*中國(guó)建筑科學(xué)研究院有限公司科研基金項(xiàng)目（20181802330730041）。

 作者簡(jiǎn)介：蔣方新，碩士，高級(jí)工程師，Email：316271991@qq.com。