Integrated wind-induced response analysis and design optimization of tall steel buildings using Micro-GA

摘要

This paper presents an integrated procedure for wind-induced response analysis and design optimization fornrectangular steel tall buildings based on the random vibration theory and automatic least cost design optimizationntechnique using Micro-Genetic Algorithm (GA). The developed approach can predict wind-inducedndrift and acceleration responses for serviceability design of a tall building; the technique can also provide annoptimal resizing design of the building under wind loads to achieve cost-effi cient design. The empiricalnformulas of wind force spectra obtained from simultaneous measurements of surface pressures on variousnrectangular tall building models in wind tunnel tests are verifi ed testifi ed using a published example. Uponnthe known wind force spectra, the equivalent static wind loads for every storey, such as along-wind, acrosswindnand torsional loads, are then determined and applied for structural analysis including estimation ofnwind-induced responses. An improved form of GAs, a Micro-GA, is adopted to minimize the structural costweight of steel buildings subject to top acceleration and lateral drifts constraints with respect to the discretendesign variables of steel section sizes. The application and effectiveness of the developed integrated windinducednresponse analysis and design optimization procedure is illustrated through a 30-storey rectangularnsteel building example. Copyright © 2009 John Wiley & Sons, Ltd.