板宽对不锈钢金属屋面风振效应的影响分析

Parameters Investigation of Panel Width on Wind-induced Response of Continuous Welded Stainless Steel Roofing System

作为具有优良承载性能的新型连续焊接不锈钢屋面体系,近年来受到广泛关注。为研究连续焊接不锈钢金属屋面系统在动态风荷载作用下板宽对系统风振效应和力学性能的影响,建立了有限元三维数值模型,并将数值计算结果与力学性能测试结果展开了对比分析,以检验数值计算模型的合理性,进一步探讨了板宽对屋面系统屋面板、支座和檩条等效应力、竖向变形的影响。结果表明:连续焊接不锈钢屋面系统以屋面板竖向振型为主,屋面板板宽越大,屋面板、檩条、支座、焊缝和板肋处等效应力也增大,屋面板变形变大,当板宽由300 mm增大至500 mm时竖向变形增大82.31%,但其最大变形位移仍仅为10 mm,显示出该新型焊接不锈钢屋面体系抗风性能的优越性。

With high capacity of resisting uplift wind load,continuous welded stainless steel roofing system is now drawing people’s at‐tention.In order to research the parameters impacts of wind-induced response and mechanics performances under dynamic wind load for the continuous welded stainless steel roofing system,the finite element model have been built and verified with test results.The dynamic wind load have been loaded on the infinite model based on the wind tunnel test,parameter analysis on different width of the roof panel has been conducted.The results indicate that the natural characteristics of this roofing system are dense,and the vertical vibration modes are domi‐nant.Equivalent stress and deformation of roof panels,purlins,supports,welds and ribs increase with increasing of the width of the panel under the same load condition.When the width of the roof panel increases from 300 mm to 500 mm,the vertical deformation increases by 82.31%,but the maximum deformation is only about 10 mm,which reflects the excellent wind resistance performance of the new stainless steel roof system.