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Structural Engineering and Mechanics
  Volume 33, Number 4, November10 2009 , pages 407-428
DOI: https://doi.org/10.12989/sem.2009.33.4.407
 


Comparison of uniform and spatially varying ground motion effects on the stochastic response of fluid-structure interaction systems
Yasemin Bilici, Alemdar Bayraktar and Suleyman Adanur

 
Abstract
    The effects of the uniform and spatially varying ground motions on the stochastic response of fluid-structure interaction system during an earthquake are investigated by using the displacement based fluid finite elements in this paper. For this purpose, variable-number-nodes two-dimensional fluid finite elements based on the Lagrangian approach is programmed in FORTRAN language and incorporated into a general-purpose computer program SVEM, which is used for stochastic dynamic analysis of solid systems under spatially varying earthquake ground motion. The spatially varying earthquake ground motion model includes wave-passage, incoherence and site-response effects. The effect of the wavepassage is considered by using various wave velocities. The incoherence effect is examined by considering the Harichandran-Vanmarcke and Luco-Wong coherency models. Homogeneous medium and firm soil types are selected for considering the site-response effect where the foundation supports are constructed. A concrete gravity dam is selected for numerical example. The S16E component recorded at Pacoima dam during the San Fernando Earthquake in 1971 is used as a ground motion. Three different analysis cases are considered for spatially varying ground motion. Displacements, stresses and hydrodynamic pressures occurring on the upstream face of the dam are calculated for each case and compare with those of uniform ground motion. It is concluded that spatially varying earthquake ground motions have important effects on the stochastic response of fluid-structure interaction systems.
 
Key Words
    spatially varying earthquake motion; stochastic analysis; Lagrangian approach; fluid finite element, fluid-structure interaction.
 
Address
Yasemin Bilici, Alemdar Bayraktar and Suleyman Adanur:
Karadeniz Technical University, Department of Civil Engineering, 61080, Trabzon, Turkey
 

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