高强混凝土温湿耦合应力计算与开裂风险分析

Calculation of hygro-thermal coupling stress calculation and cracking risk analysis for high performance concrete

摘要:

为揭示高强混凝土早龄期构件温湿耦合影响下的应力变化规律与开裂风险, 以混凝土棱柱体为例, 建立了高强混凝土构件温湿耦合计算方法和早龄期约束收缩应力计算方法, 通过编程实现了温湿度场的模拟.计算结果表明：建立的温湿度耦合作用模型能够较好预测高强混凝土1 d到28 d龄期温湿度场的发展变化规律；在浇水养护条件下, 温湿度耦合效应对高强混凝土温度场、湿度场和应力影响很小；停止养护后, 约束应力和开裂风险快速增大.养护与环境温湿度对高强混凝土早龄期应力变化和开裂风险影响显著.

Abstract:

To reveal the rule of high strength concrete stress under the influence of hygro-thermal coupling and the cracking risk, the calculation method of hygro-thermal coupling and the calculation method of early age restraint shrinkage stress were established taking the concrete prism as an example. The simulation of temperature and humidity field was realized by programming. The results show that the model of hygro-thermal coupling can predict the development of temperature and humidity change in the early age of high performance concrete from 1day to 28 days. Under the condition of watering, the hygro-thermal coupling effect has little effect on the temperature field, humidity field and stress of high performance concrete, and the restraint stress and cracking risk are growing rapidly after stoping curing. The curing and atmosphere have remarkable influence on the early ages stress and cracking risk for high strength concrete.