360°咬合金属板屋面风致易损性分析

Wind⁃induced fragility analysis of 360°occluded metal cladding roof

360°咬合金属板屋面作为众多形式金属屋面中的一种,具有良好的抗压能力,然而在真实风环境下,该类屋面的抗风揭能力尚有待研究。针对360°咬合金属板屋面系统的风灾易损程度开展了量化分析研究,以判定其真实抗风能力。为此,研究结合了力学试验与数值仿真等技术手段,对某TB开关站厂房的360°咬合金属板屋面系统的承载力以及风荷载效应进行分析。基于概率学知识,提出连接件失效概率的高效计算方法,进而快速分析金属板单元失效概率以及屋面整体的易损性,并提供损失的平均水准及变异程度量化结果。研究发现,荷载最不利工况通常对应来流垂直于屋脊线时,此时该类屋面在风力达到9级时出现破坏的迹象,当风力达到12级时,整个屋面极有可能被整体掀飞。

The 360°occluded metal cladding roof,among various metal roofing forms,exhibits commendable compressive strength.Nevertheless,its resistance to wind uplift remains inadequately explored under real wind conditions.A quantitative analysis on the wind vulnerability of the 360°occluded metal cladding roof system was conducted to ascertain its actual wind resistance capacity.Employing a combination of mechanical tests and numerical simulations,the load-bearing capacity and wind load effects on the 360°occluded metal cladding roof system of a TB switch station were analyzed.Leveraging principles of probability theory,an efficient method was proposed for computing the failure probability of connection components,facilitating rapid analysis of the failure probability of metal cladding units and the overall roof vulnerability,and quantifying the average level and variation degree of loss.The research reveals that the most critical loading condition typically occurs with wind flow perpendicular to the roof ridge.Under such conditions,indications of damage appear when wind speeds reach level 9,while the entire roof is highly susceptible to being uplifted when wind speeds reach level 12.