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(1 河南大學(xué)材料與結(jié)構(gòu)研究所，開封 475004； 2 河南大學(xué)土木建筑學(xué)院，開封 475004)

［摘要］根據(jù)瞬態(tài)熱傳導(dǎo)方程，用有限元分析軟件對(duì)拱形結(jié)構(gòu)混凝土動(dòng)態(tài)澆筑過程進(jìn)行模擬和對(duì)溫度場(chǎng)進(jìn)行仿真分析。結(jié)果表明，采用有限元仿真分析混凝土澆筑溫度場(chǎng)是可行的；混凝土內(nèi)部最大溫升在澆筑30.84h時(shí)達(dá)到峰值，約為62℃；混凝土內(nèi)部最大溫度梯度發(fā)生在澆筑22.42h時(shí)，為46.4℃/m；混凝土內(nèi)部最大溫度應(yīng)力發(fā)生在澆筑35.84h時(shí)，最大溫度第一主應(yīng)力為0.070MPa。根據(jù)溫度梯度隨時(shí)間的變化規(guī)律，對(duì)現(xiàn)場(chǎng)混凝土適時(shí)采取保溫隔熱措施，防止了拱形結(jié)構(gòu)混凝土溫度裂縫的產(chǎn)生。

［關(guān)鍵詞］大體積混凝土；拱形結(jié)構(gòu)；溫度場(chǎng)；仿真；有限元分析

中圖分類號(hào)：TU375.5文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2011)03-0078-03

Simulation and analysis of temperature field during concrete pouring in an arched structure

He Dongqing¹, Kong Qingmei², Lu Chang²

(1 Institute of Material and Structure, Henan University, Kaifeng 475004, China;

2 School of Civil Engineering and Architecture, Henan University, Kaifeng 475004, China)

Abstract:The concrete pouring of an arched structure was simulated by finite element model and the temperature field of mass concrete was calculated based on transient conduction of heat equation and boundary condition. The results indicate that the finite element model is feasible to simulate the temperature field during concrete pouring in practice. The maximum temperature rise inside the concrete is about 62℃, which is achieved at 30.84h. The maximum temperature gradient is 46.4℃/m at 22.42h. The maximum first temperature stress is 0.070MPa at 35.84h. According to the law of change about temperature gradient, the updating thermal retardation and insulation measures were adopted, which prevented temperature cracks inside concrete of the arched structure.

Keywords:mass concrete; arched structure; temperature field; simulation; finite element analysis

作者簡介：賀東青，碩士，副教授，Email: he_dongqing@163.com。

參考文獻(xiàn)

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［2］陳應(yīng)波，李秀才,張雄. 大體積混凝土澆筑溫度場(chǎng)的仿真分析［J］.華中科技大學(xué)學(xué)報(bào)：城市科學(xué)版，2004,21(2)：37-39.

［3］欒堯，閻培渝，楊耀輝，等. 大體積混凝土水化熱溫度場(chǎng)的數(shù)值計(jì)算［J］. 工業(yè)建筑，2008，38(2)：81-85.