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: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=755956
• 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.

基础设施是加拿大生活各个方面的核心，基础设施的过早损坏和损坏修复是耗资数十亿美元的问题，该项目的动机是越来越多的报告表明镀锌设施的使用性能不佳，甚至出现危险的倒塌。将开发解决方案，以提高由镀锌空心结构型材（HSS）构件和连接组成的桥梁、高速公路和停车场结构、工业厂房和输电塔的结构性能并延长其使用寿命。其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，该研究将首先解决热浸镀锌过程中高速钢部件破裂的当代问题，然后进行一系列实验和数值研究。将研究冷成型、焊接、镀锌、应变时效、液态金属脆化和排气孔对接头性能的综合影响。制定高速钢制造规范和裂纹控制指南的目的是：(1) 帮助加拿大钢铁制造商、制造商和镀锌厂优化其生产流程；(2) 帮助加拿大工程师指定适当水平的对策，以最大限度地降低高速钢裂纹的风险。该研究还将更好地了解镀锌高速钢连接的特性和结构性能，并为由高强度钢组成的坚固、经济高效和持久的管状结构提供设计指南和建议。 -表现钢材在经济、环保、节能方面具有明显优势，但现行加拿大钢材设计规范中针对传统钢材的设计规则限制了工程师充分利用“新钢材”的结构和建筑优势。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。实验室实验和计算机建模。