Advancing Tubular Structures

出于经济和美学方面的原因，管状结构代表着钢结构建筑的“增长领域”之一，加拿大在这一领域的专业知识已经享有盛誉。加拿大处于令人羡慕的地位，因为它既是结构管道设计技术(或“技术诀窍”)的重要出口国，也是制成品本身的出口国。北美一半以上的陆上结构管--或中空结构型材(HSS)--是由加拿大公司生产的。总之，本文的研究将解决目前阻碍该产品在实践中广泛应用的一些与冷弯HSS有关的当代问题。*短期内，调查的两个重点将集中在：(A)HSS的动态性能，以及(B)与HSS焊接连接相关的几个已知问题。六个具体*项目*涉及：(I)双层高强钢混凝土构件的抗爆和抗冲击性；(Ii)与高强钢焊接的铸钢连接件的抗爆和抗冲击性；(Iii)ASTM A1085高强钢(一种新材料)的应用和改进；(Iv)高强钢与高强钢在不规则位置的分支焊接连接；(V)高强钢与高强钢重叠的K型接头中的“隐藏焊缝”；以及(Vi)圆形高强钢与高强钢之间的焊接有效长度。这些项目的研究方法采用了小型材料试验、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、数值有限元分析(包括隐式和显式)和封闭形式的分析解。项目(I)和(Ii)需要通过现场爆破测试进行验证，这可以通过该大学由申请人指导的关键基础设施弹性中心(CRCI)及其独特的赞助进行。*从长远来看，这项研究*计划*处于管状结构知识的前沿，将推动加拿大在结构管道技术和应用方面处于国际领先地位。该研究项目进一步扩展和探索了钢铸件在建筑行业中的作用，建立在申请人于2004至2014年间在北美创新性地引入和发展这一概念的基础上。将铸造技术转移到建筑行业已经使申请者成功地将产品商业化，并预示着两个行业的进一步进步。*确保为从本科生到博士后研究员的学生提供一个激励的研究培训环境，包括非常先进的实验室和现场测试方法，使用最先进的分析和计算工具，在国际上接触其专业领域的领导者，在行业(加拿大和国外)实习，并积极参与技术转移活动。

Tubular structures represent one of the "growth areas" for steel construction, for both economic and aesthetic reasons, and Canada already has renown for its expertise in this area. Canada is in the enviable position of being a prominent exporter of both design technology for structural tubing (or "know-how") and the manufactured product itself. Over half of all North American on-shore structural tubing - or hollow structural sections (HSS) - is produced by companies of Canadian origin. All together, the research herein will resolve some contemporary issues pertaining to cold-formed HSS that currently hinder the widespread application of the product in practice.***    In the short-term, two thrusts to the investigation will concentrate on: (a) the dynamic performance of HSS, and (b) several known problems related to HSS welded connections. Six specific *projects* address: (i) blast and impact resistance of concrete-filled double-skin HSS members; (ii) blast and impact resistance of cast steel connectors welded to HSS; (iii) application and improvement of ASTM A1085 HSS (a recent new material); (iv) HSS-to-HSS welded connections with branches in irregular locations; (v) "hidden welds" in HSS-to-HSS overlapped K-connections; and (vi) effective lengths of welds in circular HSS-to-HSS connections. 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 analyses (both implicit and explicit), and closed-form analytical solutions. Projects (i) and (ii) entail verification by field blast testing, which is possible through the university's "Centre for Resilience of Critical Infrastructure" (CRCI), directed by the Applicant, and its unique sponsorship.***    In the long-term this research *program*, at the forefront of knowledge on tubular structures, will propel Canada into a leading position internationally for structural tubing technology and application. The research program further extends and explores the roles for steel castings in the construction industry, building on the innovative introduction and development of this concept in North America by the Applicant between 2004 and 2014. This transfer of foundry technology to the building sector has already involved successful product commercialization by the Applicant and heralds even further advances for both industries.***    A stimulating environment for research training is ensured for students, ranging from undergraduates to post-doctoral fellows, involving highly advanced laboratory and field testing methods, use of state-of-the-art analytical and computational tools, international exposure to leaders in their field of specialization, internship placements in industry (both in Canada and abroad) and active participation in technology transfer activities.