Wind Tunnel Experiment And Wind-Induced Response Analysis Of Complex High-Rising Structures

High-rising structure is somewhat different from others because of being high,light, flexible and slim. It has been widely used in some related fields such as powertransmission, communication, broadcasting and television system. Due to itscharacteristic of shape, the dominating load of high-rising structure is wind load. Withthe growth of demand and progress of technique, it has been developed to be muchhigher, lighter and softer which increases its sensitivity to wind load.Along with the development of science and technology, the height of tallbuilding increases constantly. Light and stiff building materials were used widely, atthe same time, there is lots of tall building and high-rising structure with complexityshape. Now investigation on wind induced response of tall building is graduallypopular and there is little investigation on high-rising structures with complexityshape. Based on wind tunnel tests of Henan broadcast and TV Tower,Three-dimensional wind load and wind reduced response of high-rising structure withcomplexity shape are analyzed in the paper.3D wind load of Henan broadcast and TV Tower is investigated based on Highfrequency force balance measurement. Different directions of wind load arecompared and analyzed, and the impacts of wind direction on wind load are alsoinvestigated. On the basis of these results, computational method of 3D wind loadTime History on different height of structures is presented in this paper. Finally, TimeHistory Analysis method is used to study Wind-induced 3D Vibration Response ofthis structure. At the same time, frequency domain analysis method of wind inducedresponse on complex high-rising structures with 3D coupled modes are presented inthis paper. Power spectral density of mode generalized force are obtained by usingmode shape correction based on High frequency force balance measurement. On thebasis of it, characteristic of Power spectral density and cross power spectral density ofdifferent mode generalized forces and the correlation of power spectral density of mode generalized forces in different directions are discussed. The methods forcalculating background and resonant components of the responses by using completequadratic combination (CQC) scheme are correspondingly developed. The influencesof wind direction, mode numbers, mode correlation, damping ratio on wind inducedresponse are also studied.Wind tunnel tests of aero-elastic models are introduced in detail, which includesimulation of the wind field, manufacture of the model and method of theexperiments. The author processed the experimental data, calculated the RMS ofdisplacement and acceleration response in alongwind, acrosswind and torsionaldirections at different heights, and analyzed the rules by which the RMS responsesvaried with the wind velocity, and wind directional angels.In this dissertation, standard method and simplified method to determineequivalent wind load is proposed. By means of compared with calculating results ofresponse, using this simplified method can avoid complicated calculate process, andguarantee satisfied accuracy. Finally, the problems caused by application of peakfactor and damping ratio in the process of structure design are studied.