横缝引起的非整体性对小湾拱坝温度应力的影响研究

通过12种工况的有限元计算，本文对小湾拱坝按整体结构和非整体结构分别考虑时，在不同的温度变幅下坝体的应力分布情况进行了对比。通过对比可以看出，在目前的温度变幅下，小湾拱坝分别按整体结构或非整体结构计算的结果相差不大。但是，当温度变幅达到目前变幅的三倍时，按整体或非整体结构分别计算所得到的坝体最大拉应力将出现一定的不同。

Numerical analysis about effect of contraction joints on the temperature stress contribution of Xiaowan arch dam

Using finite element method, the effect of contraction joint on the temperature stress variation of Xiaowan arch was analyzed in this paper. Three loads were considered in the computation:gravity, impounded water and temperature fluctuation. The calculation results clearly showed that under the normal temperature fluctuation in Xiaowan, the nonmonolithic property(considering contraction joint existing) has small effect on the stress contribution at Xiaowan arch dam. However, if the temperature fluctuation was up to three times as many as that in the normal condition at Xiaowan arch dam(the normal fluctuation of Xiaowan is somewhat small), the nonmonolithic property would have obvious effect on the stress contribution of the structure, especially in the temperature falling cases. From the analysis results, it can be concluded that the nonmonolith should be considered in the design of an arch dam under bad temperature condition.