本文選題：混凝土 + 散熱系數(shù)　； 參考：《施工技術(shù)》2015年24期

【摘要】：利用有限元分析軟件Midas模擬了散熱系數(shù)、水泥用量對(duì)混凝土溫度及應(yīng)力的影響,實(shí)際工程中根據(jù)模擬結(jié)果采取合理的防裂措施。結(jié)果表明:隨著對(duì)流系數(shù)的增大,溫升降低,應(yīng)力增大,現(xiàn)場(chǎng)采取覆蓋土工布、使用聚苯乙烯或木模板的方法來使混凝土的散熱系數(shù)保持在20~40k J/(m·h·℃),開裂有所減小;隨著水泥用量的增加,混凝土溫升增大,應(yīng)力增大,每減小40kg/m~3水泥,溫度下降2~3℃,實(shí)際工程中通過摻加礦物摻和料來替代水泥來實(shí)現(xiàn);早期拉應(yīng)力存在于混凝土表面,后期存在于混凝土內(nèi)部,實(shí)際工程中應(yīng)注重早期混凝土表面保溫。
[Abstract]:The effects of heat dissipation coefficient and cement content on the temperature and stress of concrete were simulated by the finite element analysis software Midas. Reasonable crack prevention measures were taken according to the simulation results in practical engineering. The results show that with the increase of convection coefficient, the temperature rise decreases and the stress increases. The cracking of concrete is reduced by covering geotextile and using polystyrene or wood formwork to keep the heat dissipation coefficient of concrete at 20 ~ 40kJ / (m h 鈩，

本文編號(hào)：2053874