Durability, Cost and Structural Analysis of a Novel Re-Roofing System

在仓库和大跨度轻钢结构中常见的平坡或低坡屋顶上使用钢屋顶甲板的目的是实现四个主要功能：(i)荷载分配，（ii）横向支撑（结构隔膜），（iii）屋顶组件的支撑（膜，绝缘等）和（iv）屋顶组件的防火。通常，钢屋顶甲板会因腐蚀性材料泄漏或简单的长期氧化（即生锈）而受损。一旦钢甲板被腐蚀，它的主要功能就会受到损害，必须加以纠正。迄今为止，通过以下两种方式实现了纠正：(1)移除和更换受损的甲板区域，或(2)直接在受损区域上安装新的甲板。这两种策略都给建筑业主和屋顶下的居住者带来了严重的问题和收入损失。由于过程中的危险条件和风险，清除腐蚀的甲板通常会暂停所有内部操作（即收入损失）相对较长时间。在受损区域直接安装新甲板通常会导致新旧甲板之间的腐蚀继续（转移）。RBS咨询工程师有限公司（RBS）开发了一种新颖的概念，在现有的变质金属甲板区域上方安装新的金属甲板和屋顶组件，而很少或不会中断内部流程（即不损失收入）。该过程包括多个甲板带，用于在结构上将新的屋顶甲板/组件连接到仓库建筑类型中常见的主要开腹板钢托梁系统的顶部。提出的研究旨在开发新的结构和耐久性分析，以评估与新系统相关的性能的各个方面。

The use of steel roof decks on flat or low slope roofing typically found in warehouse and long-span light steel structures is intended to perform four primary functions: (i) load distribution, (ii) lateral support (structural diaphragm), (iii) support of the roof assembly (membrane, insulation, etc.) and (iv) fire protection of the roof assembly. Often, steel roof decks become compromised through leaking of corrosive materials or simple long-term oxidation (i.e. rusting). Once the steel decking is corroded, its primary functions are compromised and must be corrected. To date, correction has been achieved by either: (1) removing and replacing areas of damaged decking or (2) installing new decking directly over the damaged areas. Both of these strategies pose significant problems and loss of revenue to building owners and the occupants below the roof. Removal of corroded decking typically suspends all interior operations (i.e. loss of revenue) for relatively long periods of time due to hazardous conditions and risks during the process. Installation of new decking directly over compromised areas typically results in the corrosion continuing (transferring) between the old and new decking. RBS Consulting Engineers Ltd. (RBS) has developed a novel concept to install a new metal deck and roof assembly above existing areas of deteriorated metal decking with little or no interruption to interior processes (i.e. no loss of revenue). The process comprises a plurality of deck straps used to structurally bridge the new roof deck/assembly to the top of the main open-web steel joist system typically found in the warehouse building typology. The proposed research aims to develop novel structural and durability analysis to evaluate various aspects of performance associated with the novel system.