Study On Wind-induced Response Of Multilayer Cold-formed Thin-walled Steel Structure Building

The application of multilayer cold-formed thin-walled steel structure building in China has been increasing,it is a typical green light steel system.in recent years,China's wind caused the collapse of a large number of low rise buildings,including a lot of light steel structure damage.Based on this,it is necessary to study the wind resistant performance of the multilayer cold-formed thin-walled steel structure,grasping the dynamic response of wind load,and evaluate its safety and comfort.The conclusion can be used as the reference for the wind resistance of multilayer cold-formed thin-walled steel structure in Engineering.In this paper,the aeroelastic model of the regular shape multilayer cold-formed thin-walled steel structure building is designed and manufactured,and experimental study on wind-induced response under different conditions of aeroelastic model in wind tunnel.On the basis of experiment,the finite element numerical simulation method is used to simulate and analyze the wind resistance simulation and vibration reduction of the complex shape multilayer cold-formed thin-walled steel structure building,the main conclusions are:(1)The test result:(1)For the regular shape multilayer cold-formed thin-walled steel structure building,the unfavorable wind direction of the X direction displacement is 22.5o and 45 o,the unfavorable wind direction is 45 o and 90 o in the Y direction displacement.Under the basic wind pressure in most areas of China,the structural displacement response is small and the overall safety is better.(2)The most unfavorable wind direction of X acceleration is 45 o,and the unfavorable wind direction of Y acceleration is 0o and 90 o.When the basic wind pressure is greater than or equal to 0.6k N/m2,it is necessary to take into account the comfort caused by the acceleration of the problem and the relevant comfort design.(3)Displacement response of structure is mainly composed of first order vibration mode and wake response contribution,and acceleration response of higher modes need more consideration.(2)The finite element analysis results:(1)The complex shape multilayer cold-formed thin-walled steel structure building under high pressure in the wind direction of 22.5o?45o?157.5o?180o,and the proposed engineering design to consider the local common wind direction to avoid the adverse pressure angle.(2)The most unfavorable wind direction of the X direction displacement and acceleration of the structure is 157.5o,and the unfavorable wind direction of Y direction displacement is 45 o,67.5o,90 o,the most unfavorable wind direction of Y acceleration is 180 o.For the parts with large displacement and acceleration of the structure,the installation of diversion device and damper can be adopted in the project.The X response of the structure is the main contribution of the f irst order mode,and the Y response is not only related to the first order mode,but also from the wake response control.(3)The increased range and amplitude of damping ratio have different effects on the reduction of displacement and acceleration.At the top of the structure,the maximum decrease of the peak displacement of X and Y appears in the damping ratio from 0.08~0.0 9,The maximum decrease of X to the peak of acceleration occurs when the damping ratio is from 0.08~0.09,The maximum decrease of Y to the peak of acceleration occurs when the damping ratio is from 0.07~0.08.