混凝土结构早龄期开裂的预测

为了减少混凝土结构早龄期的开裂,提高混凝土结构的使用寿命,以可靠度理论为基础,建立了混凝土结构早龄期开裂的功能函数(?)=r-s.利用敏感系数来表征混凝土早期的水化放热和自收缩对功能函数的影响,引入部分系数,描述混凝土结构实际值与设计值之间的关系,并确定混凝土结构的临界开裂风险.计算了混凝土挡土墙的开裂风险,并对其开裂情况进行预测,预测的结果与观测的情况基本一致.混凝土结构早龄期开裂的预测为优化混凝土材料的组成提供了依据,可以减少混凝土结构早龄期的开裂.

Forecast of concrete structure cracking at early age

The probability of concrete structure cracking at early age is estimated by cracking probability and critical cracking risk with probabilistic method for a real case of concrete wall. The analysis model of cracking (?)= r - s is based on the theory of reliability of structures. The sensitivity coefficients calculated by this model can express the influencing efficiency of the temperature change in structure and shrinkage on the cracking of concrete structure in early age. The calculation results show that cracking probability and critical cracking risk can be applied to analysis and forecast of concrete wall cracking. Prediction of concrete structure cracking at early age provides basis for concrete proportion optimization and reduces the concrete structure cracking through the forecast and analysis of concrete structure.