Numerical and Physical Analysis on the Response of a Dam’s Radial Gate to Extreme Loading Performance

Abstract

Maintaining the reservoir safety of large dams has considerable importance for the public where they are constructed in heavily populated and industrialized areas. The extreme hydrodynamic force caused by ground acceleration, cavitation damage, and vibration are among concerns that threaten the safety of the spillway and its conveyance structures when subjected to a natural disaster, such as earthquakes and severe floods. Current research investigates the hydrostatic and hydrodynamic performance of the Karkheh Dam spillway radial gate through 3-D finite element (FE) models using ABAQUS/Explicit. The common loads applied on the radial gate were reviewed and stress–strain in the skin plate and trunnion were investigated as a result of developed hydrodynamic pressures. The performance of conveyance structures subjected to significant discharge was also investigated through a small-scale model to evaluate the cavitation damage index. The results of this research will help researchers in the field of civil and hydraulic engineering for the risk analysis of the radial gates and conveyance structures.

Influence of Asymmetric Rolling Process on the Microstructure Properties of Bimetallic Sheet Metals

“…The first stage of numerical research was to import the designed tools and input material, which form the objects of computer simulation. In order to obtain the most accurate results of numerical tests, a very important stage of design is the right refinement of the finite element mesh [ 36 , 37 ] on the surfaces of the object. A triangular mesh was used in this case.…”

Numerical Simulation and Application of Radial Steel Gate Structure Based on Building Information Modeling under Different Opening Degrees

“…Simultaneously, because of the uncertainty of the fluid-structure coupling effect and the instability of water flow, it is difficult to obtain the distribution law of the load acting on the radial gate [5]. At present, scholars have adopted field prototype observation, hydraulic model tests [6], and numerical simulation [7] to solve this problem [8]. Field prototype observation requires image velocimetry equipment, high-precision digital pressure sensors, and a multi-channel vibrating data acquisition system, and it is obviously affected by the environment, sensors are expensive, and there is a complex sensor layout, which makes the field prototype observation of radial gates difficult and it cannot predict the dynamic changes of the gate [9].…”

Theoretical analysis and simulation calculation of hydrodynamic pressure pulsation effect and flow induced vibration response of radial gate structure

“…However, the theoretical analysis method of fluctuating water pressure needs a large amount of calculation, and it is difficult to obtain the overall distribution of gate leaf pulsating water pressure. Moreover, the field measurement is often limited by the complex structure of gate and the difficult arrangement of measuring points in service environment [14][15][16] .Considering the vibration of gate opening induced by fluctuating water pressure and flow, numerous theoretical analysis, simulations, and experimental researches are still needed 17,18 . This paper establishes the finite element model with coupling of fluid field and solid field of radial gate structure based on the engineering background, adopts the method of combining finite element simulation with field measurement, and investigates the distribution of fluctuating water pressure on radial gate leaf and the vibration response of the whole gate structure caused by flow excitation.…”

“…However, the theoretical analysis method of fluctuating water pressure needs a large amount of calculation, and it is difficult to obtain the overall distribution of gate leaf pulsating water pressure. Moreover, the field measurement is often limited by the complex structure of gate and the difficult arrangement of measuring points in service environment [14][15][16] .…”