Study On Wind Vibration Performance Of Continuous Welded Stainless Steel Roof System

In recent years,the destruction of metal roofs of large-span roof structures due to wind loads has occurred from time to time.Continuously welded stainless steel roofing systems have the characteristics of high bearing capacity and good waterproof performance.At present,the research on the wind resistance of metal roofs is mainly based on static loading and quasidynamic loading.However,these two loading systems do not consider the spectral characteristics of pulsating wind loads.The equivalent stress and deformation of the metal roof under pulsating wind load need to be further studied.In this paper,the continuous welding stainless steel roofing system of the sports center in Zhaoqing New District is taken as the research object.Based on the Ansys Workbench finite element software,the finite element model of the main stress members such as roofing panels,supports and purlins in the roofing system is established.Based on the correctness of the meta-model.Second,the equivalent stress and deformation of the continuous welded stainless steel roof under the wind load based on the static wind resistance test and the wind tunnel test are analyzed.Third,the natural vibration of the roof panel on the main structure is further analyzed(Purlin)the effect of equivalent stress,and then analyze the influence of different parameters such as the width,thickness and wind load of the roof slab on the equivalent stress of the roof slab,support and purlin.1.Established the finite element model of the roof slab,support and purlin,and compared the simulation results of the finite element with the test phenomenon and results of the continuous welded stainless steel roofing system wind resistance performance test,verified the correctness of the finite element model,and analyzed.The equivalent stress and deformation of continuous welded stainless steel roofing system under the wind load based on static wind resistance test.The results show that the equivalent stress at the corner of the roof slab is the most concentrated,but the roof slab is not damaged under the static load of 10 k Pa,indicating that the continuous welded stainless steel roof system is a roof system with excellent wind resistance.2.The comparative analysis of the equivalent stress difference of different areas of roof slab,bearing and purlin under the continuous loading of stainless steel roof under the wind load test based on static wind resistance test and wind tunnel test.The results show that the equivalent stress of continuous welded stainless steel roof slabs,supports and purlins under wind load based on wind tunnel test is significantly increased compared to the wind load based on static wind resistance test,especially the equivalent stress in the support area.The maximum growth rate can reach more than 50%,and the maximum equivalent stress appears at the corner of the roof of the supporting column.3.Two finite element models including roof slab,support,purlin and purlin only were established,and the equivalent stress of purlin was compared to analyze the effect of continuous welding stainless steel roof slab on the equivalent stress of the main structure(purlin).The results show that in the limited model of purlins,the equivalent stress on purlins is relatively big.This is because the natural vibration and damping of the roof slab dissipate part of the energy,which leads to a reduction in the equivalent stress transmitted to the lower purlins.In addition,due to the presence of the roof panel,the power spectrum of the wind load transmitted to the lower purlin will be amplified at the fundamental frequency of the roof panel.4.The relevant parameters of the board width and board thickness of the roof panel are analyzed to analyze the effect of different board types on the equivalent stress of the roof system.At the same time,in order to avoid the accidental calculation results,combined with the wind tunnel test,the load time history of different measurement points was also selected to analyze the results.The results show that when the panel width is increased from 300 mm to 500 mm,the maximum equivalent stress and deformation of the roof panel are increased by 28.04% and 82.31% respectively.When the panel thickness is increased from 0.3mm to 0.6mm,the maximum equivalent stress of the panel And deformation are reduced by 12.86% and 25.70% respectively.When the peak value of pulsating wind load is the same,changing the wind load time course makes the maximum equivalent stress and deformation difference of the roof slab within 3%.