混凝土的温度裂缝及其裂缝稳定性初探

Preliminary analysis of temperature cracks and crack stability of concrete

分析了大坝混凝土表面温度裂缝的成因、混凝土的破坏机理,以及模拟计算中的裂缝处理方法,并采用分布裂缝模型的处理方法,应用ANSYS软件对盐津桥拱坝重力墩在已知温度场下的温度裂缝进行了计算分析。还对该重力墩在温度荷载与外荷载共同作用所形成的复杂应力场下的裂缝计算分析,将其分析结果与仅仅在温度荷载作用下的裂缝分析结果进行了对比,并研究裂缝在使用期的稳定性。

This paper analyzes the contributing factors of temperature cracks on surfaces of dam concrete, the failure mechanism of concrete and the methods for crack treatment in simulation computation. A distributed crack model and ANSYS software are used to compute and analyze temperature cracks of the gravity pier of Yanjinqiao arch dam in case of the given temperature field. For those cracks in complicated stress field caused by the joint action of temperature loads and external loads, the computation and analysis are also conducted, and their analysis results are compared with those obtained only due to temperature loads. Crack stability in the lifetime of dams is also studied.