The Finite Element Analysis Of Sluice Breast Wall Structure

Breast wall, which is one of the most common engineering detailed structure of hydraulic engineering, can retain water, decrease the size of the gates and hoist force, increase the lateral rigidity of the lock chamber and improve the reliability and safety of the projects. Breast wall is divided into simply supported form and clamped supported form. The simply one, which is poured separating from pier, is generally calculated according to simply supported form in engineering design; The clamped one, which is poured with pier over the same period, is calculated according to two edges fixed method. However, the hypothesis of the two calculation methods are not perfect and the computation is rough,also it does not match with the actual stress, because the connection of breast wall and pier can not be regarded as simply supported and clamped supported connection. Whether the breast wall settings is reasonable and economical or not will directly affect safe operation of the engineering and economic benefits after its completion. Therefore, it is necessary to make a research on calculation of the structure of breast wall to improve its design theory and method. Meanwhile it has an important significance to the further improve of the calculation theory of lock chamber structure.the paper focus on the typical breast wall structure:Firstly, establishes finite element models of single arch sluice, which makes comparative analysis in connection with the two conditions of simply supported form and clamped supported form. It comes out that in the upstream face the ends of clamped supported breast wall will produce larger tensile stress than simply supported one, whose stress distribution is relatively uniform; in the downstream face, the middle parts of breast wall will produce larger tensile stress which in the simply supported condition is greater than in the clamped supported condition.Secondly, in order to point out the place where do not conform to the actual situation with the calculation method of mechanics of materials or structural mechanics(the following only simply substituted by material mechanics), the paper compares the two calculation methods and tries to find out the regular pattern from the results of the two calculating methods. From the analysis and the comparison of the calculation, in the clampeded supported condition,there is a certain relationship between the end and the middle moment value with the calculation method of mechanics of materials and that with the finite element algorithm, and the result by the former is much larger than that by the latter, which shows that calculation method of mechanics of materials is more conservative. However, in the simply supported condition, the moment value of the breast wall end part by the calculation method of mechanics of materials is0, but that by the finite element algorithm is not0, which turns out that the result of the end part by the calculation method of mechanics of materials doesn’t suit the actual conditions, in other words, simply supported breast wall can not be simply regarded as simply supported connection.Finally, this paper establishes the whole finite element model of the two hole sluice and compares this with the single hole breast wall stress, and come to the conclusion that in the whole situation, the stress of the breast wall under side soil pressure is larger than single hole one, besides, the stress condition is more complex. This shows that the impact of both sides of the lock chamber on breast wall stress can not be ignored.