Frontiers of Tubular Structures

尽管加拿大经济总量约为美国的十分之一，但在过去10年中，加拿大焊管[包括冷弯空心结构型材(HSS)构件]的产量总计1680万吨，占美国产量的91%(世界钢铁协会《2018年钢铁统计年鉴》)。这一制造业对加拿大的价值是巨大的，加拿大也处于令人羡慕的地位，在结构管道设计技术方面处于世界领先地位。本文的研究旨在进一步推进这一技术地位，并将解决目前阻碍该产品在实践中更广泛应用的一些当代问题。 在短期内，调查的两个重点将集中在：(A)高速钢材料性能，以及(B)与螺栓和焊接高速钢连接有关的几个已知问题。五个具体*项目*涉及：(I)矩形高速钢结构构件在近场爆炸荷载下的抗爆能力；(Ii)矩形高速钢构件之间使用高强度钢的连接；(Iii)矩形高速钢构件之间的压接和螺栓柱拼接；(Iv)复合荷载下圆形高速钢构件之间的螺栓法兰-板连接；以及(V)圆形高速钢构件之间的直通式T形连接。这些项目的研究方法包括小型材料试验、大学实验室的中型构件和部件试验、现场结构的大规模试验、数值有限元(隐式和显式)分析、计算流体力学分析和封闭形式的解析解。 申请人维持并提议进一步扩展长期研究计划，该计划长期处于管状结构的前沿。申请者的工作为执业工程师带来了创新和合理的设计建议，为北美和世界各地的钢管钢结构设计奠定了基础。通过走在管状结构知识的前沿，这项提案的进展将使加拿大在结构管材技术及其应用方面保持在国际领先地位。 确保为从本科生到博士后研究员的学生提供激励的研究培训环境，包括实验室和现场测试的先进方法，使用最先进的分析和计算工具，接触其专业领域的国际领先者，在工业(包括加拿大和国外)实习，并积极参与技术转让活动。

Despite the Canadian economy being approximately one-tenth that of the U.S., over the last 10 years Canada's production of welded tubes [which includes cold-formed hollow structural section (HSS) members], totalling 16.8 million tonnes, represents 91% of the quantity produced in the U.S. (World Steel Association Steel Statistical Yearbook 2018). The value of this manufacturing industry to Canada is enormous, and Canada is also in the enviable position of being a world leader in terms of design “know-how” for structural tubing. The research herein aims to further advance that technological position and will resolve some contemporary issues pertaining to cold-formed HSS that currently hold back even more widespread application of the product in practice. In the short-term, two thrusts to the investigation will concentrate on: (a) HSS material performance, and (b) several known problems related to bolted and welded HSS connections. Five specific *projects* address: (i) blast resistance of rectangular HSS members under near-field blast loading; (ii) connections between rectangular HSS members using high-strength steel; (iii) swaged and bolted column splices between rectangular HSS members; (iv) bolted flange-plate connections between circular HSS members under combined loads; and (v) through-member T-connections between circular HSS members. The research approaches to these projects employ small-scale material tests, medium-scale member and component testing in the university laboratories, large-scale testing of structures in the field, numerical finite element (both implicit and explicit) analyses, computational fluid dynamics analyses, and closed-form analytical solutions. The applicant has maintained, and proposes to further extend, a long-term research *program* that has long been at the frontiers of tubular structures. The Applicant's work has resulted in innovations and rational design recommendations for practicing engineers that have set the course for the design of tubular steel structures, in North America and worldwide. By working at the forefront of knowledge on tubular structures, progress from this proposal will keep Canada at the leading edge, internationally, for structural tubing technology and its application. A stimulating environment for research training is ensured for students, ranging from undergraduates to post-doctoral fellows, involving advanced methods for laboratory and field testing, use of state-of-the-art analytical and computational tools, exposure to international leaders in their field of specialization, internship placements in industry (both in Canada and abroad), and active participation in technology transfer activities.