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

在仓库和大跨度轻型钢结构中，通常在平屋顶或低坡度屋顶上使用钢屋顶板，旨在执行四个主要功能：（i）负载分布，（ii）横向支撑（结构隔板），（iii）支撑屋顶组件（膜，绝缘等）。以及（iv）屋顶组件的防火。 通常情况下，钢屋顶甲板会因腐蚀性材料的泄漏或简单的长期氧化（即生锈）而受损。 一旦钢桥面被腐蚀，其主要功能就会受到损害，必须加以纠正。 到目前为止，已经通过以下两种方式实现了纠正：（1）拆除和更换受损桥面的区域，或（2）在受损区域直接安装新桥面。 这两种策略都给建筑物业主和屋顶下的居住者带来了重大问题和收入损失。 由于拆除过程中的危险条件和风险，拆除腐蚀的桥面通常会在相对较长的时间内暂停所有内部运营（即收入损失）。 直接在受损区域上方安装新桥面板通常会导致新旧桥面板之间的腐蚀持续（转移）。 RBS Consulting Engineers Ltd.（RBS）开发了一种新的概念，在现有的损坏金属盖板区域上方安装新的金属盖板和屋顶组件，很少或不中断内部流程（即没有收入损失）。 该过程包括多个甲板带，用于在结构上将新的屋顶甲板/组件桥接到通常在仓库建筑类型中发现的主开放式腹板钢托梁系统的顶部。 拟议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.