Analysis for the Vibration Mechanism of the Spillway Guide Wall Considering the Associated-Forced Coupled Vibration

Abstract

During the flood discharge in large-scale hydraulic engineering projects, intense flow-induced vibrations may occur in hydraulic gates, gate piers, spillway guide walls, etc. Furthermore, the vibration mechanism is complicated. For the spillway guide wall, existing studies on the vibration mechanism usually focus on the vibrations caused by flow excitations, without considering the influence of dam vibration. According to prototype tests, the vibrations of the spillway guide wall and the dam show synchronization. Thus, this paper presents a new vibration mechanism of associated-forced coupled vibration (AFCV) for the spillway guide wall to investigate the dynamic responses and reveal coupled vibrational properties and vibrational correlations. Different from conventional flow-induced vibration theory, this paper considers the spillway guide wall as a lightweight accessory structure connected to a large-scale primary structure. A corresponding simplified theoretical model for the AFCV system is established, with theoretical derivations given. Then, several vibrational signals measured in different structures in prototype tests are handled by the cross-wavelet transform (XWS) to reveal the vibrational correlation between the spillway guide wall and the dam. Afterwards, mutual analyses of numeral simulation, theoretical derivation, and prototype data are employed to clarify the vibration mechanism of a spillway guide wall. The proposed mechanism can give more reasonable and accurate results regarding the dynamic response and amplitude coefficient of the guide wall. Moreover, by changing the parameters in the theoretical model through practical measures, the proposed vibration mechanism can provide benefits to vibration control and structural design.

Experimental and numerical investigation of flow over a spillway bend with different combinations of permeable spur dikes

“…Various researchers in recent years have studied the flow characteristics in the spillway bend and have been dedicating to seeking kinds of auxiliary energy dissipaters for reducing water surface difference, improving the flow characteristics, and enhancing energy dissipation efficiency within the bend, such as guide wall (Zhang et al 2016;Lian et al 2019), diversion structure, sloped ridge (Zhou et al 2014), and solid spur dike ( Jamieson et al 2013). Safarzadeh et al (2016) investigated the flow and scoured patterns in a 90°bend with two submerged or non-submerged T-shaped spur dikes using the SSIIM (Sediment Simulation In Intakes with Multiblock) numerical model.…”

Vibration analysis of metallic structure of an innovative dam gate

“…This phenomenon is studied and the system is modeled. 23,24 The authors of these papers propose a model that provides more accurate results (proven by measurements) in the case of the dynamic response of the structure. The results regarding the behavior of dams in the event of an earthquake are presented.…”

Presentation and Verification of an Optimal Operating Scheme Aiming at Reducing the Ground Vibration Induced by High Dam Flood Discharge

“…The natural environment is inevitably disturbed and many environmental and ecological issues can result [1][2][3][4][5][6][7] if insufficient water resources planning, unreasonable operation schemes, and obsolete construction technology are applied. The vibration problems of hydraulic structures (e.g., a dam body [8,9], a hydraulic gate [10][11][12], a gate pier [13,14], a guide wall [15,16], and a plunge pool floor [17]) induced by high dam flood discharge are originally an engineering problem that has an adverse impact on structural safety and normal operation. However, ground vibrations induced by the flood discharge of several large hydropower engineering projects have recently been observed, and adverse effects on the nearby building safety and the physical and mental health of surrounding residents have been identified [18][19][20].…”