Abstract
As an important part of the navigation facilities for water conservancy and electricity in Gezhouba, the operation safety of herringbone gates is critical. Due to the minor torsional stiffness of the gate, it is easy to produce torsional deformation during operating under the water pressure, wind load, and gravity, which may lead to fatigue damage. In this study, a gate model with a combination of plate unit and the solid unit was developed, taking a ship lock herringbone gate as an example. According to the gate load under different working conditions, such as self-weight, surge, etc., in this research, we used the finite element analysis software ANSYS to analyze and calculate the stress and strain of the gate, with and without a back tie, and obtained the characteristics of the gate torsional deformation under various working conditions. The results show that the gate’s deformation degree and the direction under different working conditions vary greatly. The maximum deformation point mostly appears in the upper or lower corners of the oblique joint column. The gate deformation can be significantly reduced by adding the back tie. The research results provide a theoretical basis for further optimizing the design of the gate and installation of the back tie to reduce the fatigue damage of the miter gate.
Highlights
Miter gates are widely used in ship locks in navigable rivers
The herringbone gate is an important part of navigation facilities
It is important to improve the torsional rigidity of the gate so that it is always in a state of no deformation or less deformation; adding a back tie rod is currently the primary means of this problem
Summary
Miter gates are widely used in ship locks in navigable rivers. The mass and size of the gate leaf of large miter gates are significant, and belong to a typical super large open thin-walled structural member [1], in structure. Through the analysis of gravity, water pressure, and wind load, the stress conditions of the gate under different operating states are mainly divided into the following four types: State 1: the gate hangs freely and is only affected by its gravity. The water level difference between the upstream and downstream of the gate reaches the maximum, and the wind load acts on the downstream surface of the gate. Taking the maximum wind load as an example and at the moment of gate opening, the rotation trend makes the upstream water pressure become resistant. Taking the maximum wind load as an example and the moment the gate is about to close, the rotation trend makes the downstream water pressure resistant, and the upstream water pressure is almost zero. Calculate the total wind pressure on the gate according to Equation (2)
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