Study Of Hoirzontal Wind-induced Vibration Response For Light-weight Steel Structure With Gabled Frame

The light-weight steel structure with gabled frame is the most widely used structure form inthe industrial plant. Due to its less steel usager, roof structure is light, the speed of construction isquickly and other characteristics, the light-weight steel structure with gabled frame hasdeveloped rapidly in recent years. At the same time, wind-induced dynamic response oflight-weight steel structure with gabled frame is significant because of their light weight, smallstiffness and long natural period. While the current "Technical specification for steel structure oflight-weight buildings with gabled frames"(CECS102:2002) and "Lode code for the design ofbuilding structures”(GB50009-2001) generally don’t consider the influence of wind-inducedvibration on gabled frame. Therefore, the safty of gabled frame structure attracts much attentionin recent years for its natural disaster.In recent years, the destruction of light-weight steel structure takes place constantly in thesouthern and northern regions of china, and the horizontal wind-induced vibration influence isone of the most important reasons. As the height and the span of gabled frame structure increase,the stiffness becomes smaller, the basic natural vibration period generally reaches to0.5s,sometimes even up to1s, the influence of wind-induced vibration is increasing, especially incoastal areas and northern non-seismic areas, wind load often becomes the controlling factor indesign. So it is of great theoretical and realistic significance to study the horizontal wind-inducedvibration response and wind-induced vibration factor of light-weight steel structure with gabledframe.Based on finite element software, the light-weight gabled frame steel structure with variablesection subjected to wind load is simulated. Davenport spectrum is adopted and the numericalsimulation about horizontal wind-induced vibration response is carried out. The naturalfrequencies and mode shapes are given via structural modal analysis. Power spectrum densitycurves of horizontal displacement, velocity and acceleration are selected through powerspectrum density analysis. Finally, the static displacement and RMS (root mean square) value ofdisplacement response of the structure are obtained, and by researching the calculated results, thewind vibration coefficient of displacement is calculated and some questions to be considered indesign are also proposed in this paper.The paper also discussed the related parameters such as the height, span and constraintcondition of gabled frame structure and their effects on the structure. Comparative analysis of theinfluences of various factors is taken, and changing regularity of the horizontal wind-inducedvibration response and wind-induced vibration factor in different condition are obtained. By theview of wind-induced vibration factor, some questions to be considered in design are proposedin this paper, which lays the foundation for the further research and engineering application.