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《Earthquake Resistant Engineering and Retrofitting》 2010-01
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Optimization of Tuned Liquid Column Gas Damper for Plan-asymmetric Structures

Fu Chuan 1,2(1.College of Architecture,North China University of Technology,Beijing 100144,China;2.Center of Mechanics and Structural Dynamics,Vienna University of Technology,Vienna 1040,Austria-Europe)  
The sealed,tuned liquid column gas damper(TLCGD)developed from the "classical" TLCD is a novel effective control device.With gas-spring effect,the TLCGD frequency range of application is extended up to about 5Hz and the modal structural damping is efficiently increased.The equation of relative motion of the liquid in a TLCGD can be derived using the extended non-stationary Bernoulli's equation and equivalently linearized.In this paper,the coupled lateral-torsional vibration of asymmetric tall buildings under seismic and wind loads is analyzed.If the translation dominates,the ideal position of the trace of the mid-plane of the U-or V-shaped TLCGD requires its normal distance from modal center of velocity to be maximum.The optimal parameters of TLCGD(damping and frequency ratio)are modally tuned using Den Hartog formulas,followed by fine-tuning in the state space domain considering the influence of neighbouring modes to improve the performance of TLCGD.A 3-storey plan-asymmetric structure mode is selected as an example.The numerical simulation is presented the lateral-torsional control effectiveness of the spatially placed TLCGDs system using the new design procedure.
【CateGory Index】: TU352.1
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