Abstract
In this research, the structural behavior of a morning glory spillway has been evaluated when there is an unbalanced construction in the spillway crest. The unbalanced construction is defined as the ratio of vertical unbalance in construction to the diameter of the spillway crest. The spillway structure has been modeled using finite element method and the reservoir fluid has been simulated using finite volume method. The behavior of morning glory spillways with unbalanced crests has been investigated in two scenarios: (a) the crest without any anti-vortex structure, and (b) the crest with anti-vortex structures. Both scenarios have been simulated using dynamic linear analysis method. In addition, in each scenario, three amounts of unbalanced constructions of 0.017, 0.035 and 0.052 have been considered. The analysis results have been compared with the structural response of a symmetric spillway without unbalanced construction. Based on the results, the most critical condition occurs during the water flow over the unbalanced spillway with no anti-vortex structure. On the other hand, the presence of anti-vortex piers causes asymmetric flow on the spillway crest and subsequently asymmetric flow pressure at one side of the piers.
Highlights
Spillways are one of the most important and vital structures in the life of a dam [1]
The first one is the unbalanced construction of spillway crest structure without anti-vortex structure, and the second one is the unbalanced construction of spillway crest structure with anti-vortex structure
The water flow in the morning glory spillway is modeled by two-way interaction between the structure and the fluid
Summary
Spillways are one of the most important and vital structures in the life of a dam [1]. The continuous weight and hydrodynamic loading on the body of spillway concrete structure during a flood complicates the interaction analysis of the structure and the fluid The behavior of these spillways during over flow can be predicted well using a fluid-structure interaction analysis with coupled computational fluid dynamics and structural analysis [3]. Cassidy was the first one who applied numerical method for investigating the response of morning glory spillways [4]. He modeled the effect of water depth and static pressure on the spillway crest in a two-dimensional (2D) model, and reported a good compatibility between the numerical results with actual values. In addition to proper estimation accuracy, he proposed a method to increase the convergence rate of the numerical
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