Experimental Study on Dynamic Interaction between Large U-Shape Aqueduct and Water

• Published in: KSCE journal of civil engineering Vol. 26; no. 3; pp. 1203 - 1213
• Main Authors: Wang, Haibo, Li, Chunlei, Zhao, Lijun
• Format: Journal Article
• Language: English
• Published: Seoul Korean Society of Civil Engineers 01.03.2022; Springer Nature B.V; 대한토목학회
• Subjects: Aqueducts; Civil Engineering; Damping; Damping ratio; Direction; Earthquakes; Engineering; Excitation; Fluid-structure interaction; Geotechnical Engineering & Applied Earth Sciences; Hydrodynamic pressure; Hydrodynamics; Hydroelectric power; Hydrologic cycle; Industrial Pollution Prevention; Numerical analysis; Resonant frequencies; Rigid structures; Seismic response; Seismicity; Shake table tests; Shape; Structural Engineering; Transfer functions; Water; Wave height; White noise; 토목공학; U-shape aqueduct; Shaking table test; Eigen-frequency; Dynamic fluid-structure interaction; Damping ratio
• ISSN: 1226-7988; 1976-3808
• DOI: 10.1007/s12205-021-0232-5

Hydrodynamic interaction between water and structure plays an important role in the evaluation of seismic response of aqueducts in area of high seismicity. This interaction differs in axial, lateral and vertical direction of aqueduct. Both impulsive and convective effects of water exist in lateral direction. In presented study, shaking table tests were conducted with a 1/10 model of U-shape aqueduct, of 30 m long, to study the hydrodynamic interaction. With the analyses of aqueduct and water responses to stationary White Noise excitations as well as non-stationary excitations, impulsive and convective effects of water were deduced quantitatively. Characteristic frequencies and corresponding modes of aqueduct were identified with the transfer functions of acceleration, sloshing frequencies in lateral direction were recognized with the transfer functions of seat force. Impulsive mass was deduced from the alteration in fundamental frequency and the corresponding modal seat forces of the aqueduct with and without water. Convective mass was obtained from the wave height of sloshing and lateral seat forces recorded, or the lateral modal seat force and damping ratio. Comparison was made with those given in simplified methods for rigid structure. Observed hydrodynamic pressure on the structure in the test was smaller than that based on the rigid assumption.