散热系数及水泥用量对混凝土温度及应力的影响研究

发布时间：2018-06-22 18:55

  本文选题：混凝土 + 散热系数　； 参考：《施工技术》2015年24期

【摘要】：利用有限元分析软件Midas模拟了散热系数、水泥用量对混凝土温度及应力的影响,实际工程中根据模拟结果采取合理的防裂措施。结果表明:随着对流系数的增大,温升降低,应力增大,现场采取覆盖土工布、使用聚苯乙烯或木模板的方法来使混凝土的散热系数保持在20~40k J/(m·h·℃),开裂有所减小;随着水泥用量的增加,混凝土温升增大,应力增大,每减小40kg/m~3水泥,温度下降2~3℃,实际工程中通过掺加矿物掺和料来替代水泥来实现;早期拉应力存在于混凝土表面,后期存在于混凝土内部,实际工程中应注重早期混凝土表面保温。
[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，

本文编号：2053874