寒潮作用下大型水闸施工期温控防裂仿真分析

The simulation study on temperature control and crack prevention of large sluice under cold wave strike during construction

针对大型混凝土水闸因体积庞大进行寒潮影响下的温控防裂仿真计算时精度较低的问题,提出了子母模型联合反馈修正算法,有限元计算过程中在空间上和时间上进行加密,每完成一次子模型的计算,将结果反馈至母模型。于曹闸工程实例分析表明:5℃及10℃温差区间寒潮冷击对结构表面温度影响较大,对内部影响较小,导致表面开裂,采取适当保温措施即可防裂;该计算结果可满足工程要求,提高了计算速度,证明了算法的合理性。

The simulation of temperature control and crack prevention of large sluice under cold wave strike has low accuracy due to huge volume. To overcome this shortcoming, it is proposed a sub-master model correction algorithm. During the process of finite element calculation, the model was encrypted in space and time, and the results could be fed back to master model when the sub model finished the computations. The result of engineering example in Yucao Sluice showed that the influence on temperature of surface concrete is greater than internal concrete under cold wave of 5oC and 10oC, which leads to concrete crack;thus, taking appropriate measures can prevent crack. The result satisfied the need of construction and improved the speed of computations, which implies that the algorithm is reasonable.