Development of stability design guidelines for modern I-shaped welded steel girders in Canada

加拿大现代工字形焊接钢梁稳定性设计指南的制定

• 批准号: 519937-2017
• 负责人: Imanpour, Ali
• 金额: $ 0.07万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=697601
• 关键词: Development; stability; design; guidelines; modern

Many building structures and bridges in North America are built with welded steel girders to resist gravity loads. The design of such girders is typically governed by their stability; however, various parameters can affect their stability response, including cross-sectional properties, end and loading conditions, built-in stresses and initial geometric imperfections. Current Canadian design standards are supported by studies that do not necessarily represent the design and fabrication practice of modern girders. The validity of past experimental studies and corresponding numerical simulations is questionable because of their reliance on small-scale test specimens and fabrication processes that are no longer practiced. Additionally, few studies include detailed quantification of the influential parameters. To better understand stability of modern welded steel girders, designers need improved guidelines based on data that reflect the actual behaviour of the member under design loads. Our research project focuses on four key objectives: 1) to thoroughly measure the amplitude and pattern of residual stresses that develop in the course of contemporary manufacturing and welding processes; 2) to evaluate the stability requirements for welded girders in steel bridges and buildings in light of the effect of residual stresses; 3) to evaluate current Canadian stability design requirements for I-shaped welded steel girders; and 4) to generate design recommendations for changes to Canadian standards for stability requirements in steel construction and bridge design. To achieve these aims, the research team will perform full-scale lab experiments and employ numerical modelling. We will also provide improved design tools to structural engineers for their daily work, resulting in safer structures and reduced construction costs.

北美的许多建筑结构和桥梁都是用焊接的钢梁来抵抗重力