CAREER: Performance-Based Fire Design for Cold-Formed Steel Structures

职业：冷弯型钢结构基于性能的消防设计

• 批准号: 2237623
• 负责人: Thomas Gernay
• 金额: $ 57.9万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-07-01 至 2028-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2237623&HistoricalAwards=false
• 关键词: CAREER; Performance; Based; Fire; Design

This Faculty Early Career Development (CAREER) award will derive an advanced science-based framework for assessing the fire performance of cold-formed steel structures. This framework will enable more accurate modeling of the effect of fire on cold-formed steel structures that will support improved design methods for advancing national prosperity and welfare through better safety, resource efficiency, and resilience against fire. Lightweight cold-formed steel structural systems, with high strength-to-weight ratio and rapid construction speed, are widely used in nonresidential construction in the United States. Cold-formed steel structures are traditionally protected from fire based on prescriptive provisions derived from standardized testing. However, the reliance on prescriptive provisions is costly and impedes innovation toward more sustainable and affordable buildings. This research project will develop experimental and computational capabilities for the fire analysis of cold-formed steel structures that will advance understanding of the fundamental relationship between the thermal exposure and the stability and strength of these thin-walled members, to enable better structural fire designs. The research will be complemented by an educational and outreach program to engage a broad audience on the role of structural fire engineers in building resilient communities against extreme hazards. The program will include curriculum development, outreach activities, and educational videos developed in collaboration with the Maryland Institute College of Art. Data generated from this project will be made publicly available in the National Science Foundation-supported Natural Hazards Engineering Research Infrastructure Data Depot (https://www.DesignSafe-CI.org). The specific goal of the research is to enable performance-based fire design for cold-formed steel structures by developing the capability to quantify the fire behavior of the thin-walled framing members. This behavior is largely governed by the interaction between buckling failure modes and elevated temperatures. Thus, this project will include: (i) testing of cold-formed steel studs and joists using an innovative experimental method allowing a range of transient high temperature conditions, (ii) development of thermal-mechanical computational modeling strategies and creation of high-fidelity numerical benchmarks, and (iii) development of analysis-based methods for assessing the fire performance of cold-formed steel structures. The provided data and methods will answer fundamental questions about the complex fire-thermal-structural interaction in these thin-walled members. The research thus has the potential to improve understanding of the mechanics of stability-critical structures in fire and advance simulation capability for cold-formed steel structures under physically based design fires. Beyond cold-formed steel structures, the research will create a leap toward integration of structural fire within the design procedure alongside other loading cases, which supports consistent performance-based and risk-informed design, structural optimization, and multi-hazard resilience assessment.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

这项学院早期职业发展奖将为评估冷弯型钢结构的耐火性能提供一个先进的基于科学的框架。该框架将能够更准确地模拟火灾对冷弯薄壁型钢结构的影响，从而支持改进的设计方法，通过更好的安全性、资源效率和抗火能力来促进国家繁荣和福祉。轻型冷弯薄壁型钢结构体系具有比强度高、施工速度快等优点，在美国非住宅建筑中得到了广泛的应用。根据标准化测试得出的规定，冷弯型钢结构传统上是防火的。然而，依赖规范性条款代价高昂，并阻碍了朝着更可持续和负担得起的建筑的创新。该研究项目将开发冷弯形钢结构火灾分析的实验和计算能力，以促进对热暴露与这些薄壁构件的稳定性和强度之间的基本关系的理解，从而实现更好的结构火灾设计。这项研究将得到一个教育和外展项目的补充，以吸引更多的受众了解结构消防工程师在建设抵御极端危险的弹性社区中所起的作用。该计划将包括课程开发、外展活动和与马里兰艺术学院合作开发的教育视频。该项目产生的数据将在国家科学基金会支持的自然灾害工程研究基础设施数据库(https://www.DesignSafe-CI.org).)中公开提供这项研究的具体目标是通过开发量化薄壁框架构件的火灾行为的能力，实现基于性能的冷弯型钢结构火灾设计。这种行为在很大程度上是由屈曲破坏模式和高温之间的相互作用决定的。因此，该项目将包括：(I)使用允许一系列瞬时高温条件的创新实验方法测试冷弯形钢立柱和托梁；(Ii)开发热-力学计算建模策略和创建高保真数值基准；以及(Iii)开发基于分析的方法来评估冷弯型钢结构的耐火性能。所提供的数据和方法将回答关于这些薄壁构件中复杂的火-热-结构相互作用的基本问题。因此，这项研究有可能提高对火灾中稳定性关键结构力学的理解，并提高基于物理设计的火灾下冷弯型钢结构的模拟能力。除了冷弯型钢结构，这项研究将创造一个飞跃，将结构火灾与其他荷载案例一起纳入设计程序，支持一致的基于性能和风险知情的设计、结构优化和多危险恢复能力评估。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。