摘要
直立锁缝屋面系统广泛应用于厂房、机场、车站等大型建筑中,但这类屋面自重轻且刚度较小,在风荷载下易引起大变形,强风导致的破坏案例时有发生。进行了足尺模型加载试验,并采用精细有限元数值仿真探讨此类屋面结构的弹塑性挠曲变形状况,以及最大位移和最大应力的发生位置和变化规律。研究发现,屋面板上最大挠度出现在跨中位置,但此处应力较小,最大应力出现在锁缝处支座与相邻屋面板咬合处,并且锁缝处的屋面板会稍早于支座进入塑性。通过参数化分析,探讨风压、板厚对屋面板变形的影响,并针对不同参数提出了屋面板挠曲变形的简化预测公式,利用该公式可快速预测此类屋面系统的挠度分布及最大挠度。
Standing seam roof systems(SSRS) are widely used in large structures such as factories and stations.However, this kind of roof systems is vulnerable under strong wind due to its light-weight and low stiffness. This paper investigates the elastoplastic deformation of SSRS by combining the refined finite element method(FEM)and full-scale test. The place where the maximum deflection and maximum stress occur is discussed. Results show that the largest deflection happens in the middle of roof panel and the stress is really low in this location. The largest stress occurs in the seams and the roof panel inside the seam enters the plastic range earlier than the clips.Parametric analysis is made to study the effect of wind pressure and thickness of the panel on the deformation of SSRS. A simplified mathematical model is put forward to forecast the vertical deflection of SSRS,which can predict the distribution of deflection and maximum deflection across the roof instantly.
作者
夏俞超
陈水福
XIA Yuchao;CHEN Shuifu(College of Civil Engineering and Architecture,Zhejiang University,310058,Hangzhou,China)
出处
《应用力学学报》
CAS
CSCD
北大核心
2021年第6期2338-2345,共8页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金资助项目(50978230)。
关键词
工程结构
直立锁缝
足尺试验
风致变形
有限元数值仿真
参数化分析
engineering structure
standing seam metal roof system
full-scale test
wind-induced deformation
numerical simulation
parametric analysis
