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A Novel Approach To Estimate The Wind Uplift Resistance Of Roofing Systems

机译：一种估算屋面系统抗风升能力的新方法

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Roof wind design consist of three parts: determination of wind loads, evaluation of wind uplift resistance and correlating the resistance with the design load such that the resistance is higher than the load requirement. Wind uplift resistance of a system with its respective components is evaluated in laboratory testing. This paper presents a novel approach to estimate wind uplift resistance when components are substituted during field application. Wind dynamics, on a mechanically attached single-ply roofing assembly, lift the membrane and cause fluttering, introducing stresses at the attachment locations. In such assemblies, the fastener-deck interface is a critical design factor. First, by taking steel deck as a component this paper systematically characterizes the various steel decks that are commonly used in low slope application. Second component, namely the fasteners and its engagement strength with deck have been quantified for variations of its design, size and sources. Based on this component characterization, fastener pullout resistance (FPR) is identified as a verification factor for system wind resistance estimation. When variations occur in the fastener-deck interface between the proposed and the existing configurations, the present research through case studies has proved that: "as long as the FPR of the proposed configuration is higher than the existing configuration then wind uplift ratings can be maintained". This is valid as long as both the configurations have all the remaining roofing components similar with comparable layout. Based on this verification, the study recommends that the testing lab should report the FPR along with the wind uplift resistance such that FPR can be used as a verification factor to accept design/field alternatives.
机译：屋顶风设计包括三部分：确定风荷载，评估风阻阻力以及将阻力与设计荷载相关联，以使阻力高于荷载要求。在实验室测试中评估了具有其各个组件的系统的抗风升性。本文提出了一种新颖的方法来估算在野外应用期间更换组件时的抗风隆性。机械附着的单层屋顶组件上的风动力会抬起膜并引起飘动，从而在附着位置产生应力。在这样的组件中，紧固件-甲板界面是关键的设计因素。首先，通过以钢甲板为组成部分，系统地描述了低坡度应用中常用的各种钢甲板。第二个组件，即紧固件及其与甲板的接合强度已根据其设计，尺寸和来源的变化进行了量化。基于此组件的特征，紧固件拔出阻力（FPR）被确定为系统风阻估算的验证因素。当提议的构型和现有构型之间的紧固件-甲板界面发生变化时，通过案例研究的当前研究已证明：“只要拟议构型的FPR高于现有构型，那么就可以保持风力提升等级”。只要这两种配置都具有所有其余的屋面组件且布局相似，这是有效的。基于此验证，研究建议测试实验室应报告FPR以及抗风隆性，以便FPR可以用作接受设计/现场替代方案的验证因素。

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