Towards the Design of Durable and High-Performance Tubular Structures

走向耐用和高性能管状结构的设计

• 批准号: RGPIN-2017-04047
• 负责人: Sun, Min
• 金额: $ 1.46万
• 依托单位: University of Victoria
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=666199
• 关键词: Towards; Design; Durable; Performance; Tubular

Infrastructure is central to every aspect of life in Canada. Premature deterioration of infrastructure and repair of damage are multi-billion dollar problems. The proposed research program is motivated by an increasing number of reports on poor in-service performance and even hazardous collapse of galvanized steel structures across North America. Solutions will be developed to improve the structural performance and extend the service life of bridges, highway and parking structures, industrial plants and transmission towers composed of galvanized Hollow Structural Section (HSS) members and connections. The long-term goal is to facilitate design, fabrication, construction and maintenance of durable and high-performance infrastructure in Canada.*** The research will first address the contemporary issue of cracking of HSS components during hot-dip galvanizing, followed by a series of experimental and numerical investigations on the behaviour of galvanized HSS connections under static and fatigue loadings. The combined effects of cold-forming, welding, galvanizing, strain ageing, liquid metal embrittlement and vent holes on the joint capacities will be investigated. Supplemental rules to HSS manufacturing specifications and crack control guidelines will be generated to: (1) help Canadian steel manufacturers, fabricators and galvanizers optimize their production processes; and (2) help Canadian engineers specify appropriate levels of counter-measures to minimize the risk of cracking in HSS components during hot-dip galvanizing. The research will also provide a better understanding of the characteristics and structural performance of galvanized HSS connections. Design guidelines and recommendations for robust, cost-effective and long-lasting tubular structures will be established.*** Structures composed of high-performance steel have obvious advantages in economical, environment protection and energy-saving aspects. However, the design rules in the current Canadian steel design specification, which are intended for conventional steel, are limiting engineers from fully utilizing the structural and architectural advantages of the “new-generation” very-high-strength cold-formed HSS with inherent low levels of residual stress. The research will generate supplemental rules to the existing design specification to facilitate the application of the new technology. Validation of design guidelines and recommendations will be achieved by laboratory experiments and computer modelling.

基础设施对于加拿大生活的各个方面都是核心。基础设施的过早发现和损害的修复是数十亿美元的问题。拟议的研究计划是由越来越多的关于在北美镀锌钢结构的较差的报告性能以及甚至危险崩溃的报告。将开发解决方案，以改善结构性性能并延长桥梁，高速公路和停车结构，工业电厂和传输塔的使用寿命，该塔由镀锌空心结构部分（HSS）成员和连接组成。长期目标是促进加拿大耐用和高性能基础设施的设计，制造，建造和维护。将研究冷形成，焊接，镀锌，应变老化，液体金属含量和排气孔对关节容量的综合作用。 HSS制造规格和裂纹控制指南的补充规则将生成：（1）帮助加拿大钢铁制造商，制造商和镀锌剂优化其生产过程； （2）帮助加拿大工程师指定适当水平的反测量水平，以最大程度地减少热浸镀锌期间HSS组件破裂的风险。该研究还将更好地了解镀锌HSS连接的特征和结构性能。设计指南和建议将制定出强大，具有成本效益和持久的管状结构。***由高性能钢组成的结构在经济，环境保护和节能方面具有明显的优势。但是，用于常规钢的当前加拿大钢设计规范中的设计规则限制了工程师完全利用“新代”非常高强度的冷形式的HSS的结构和建筑优势，其残留应力较低。该研究将为现有设计规范生成补充规则，以促进新技术的应用。设计准则和建议的验证将通过实验室实验和计算机建模来实现。