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钢梁建造的，以抵抗重力 负载。此类梁的设计通常取决于其稳定性；然而，各种参数可以 影响其稳定性响应，包括横截面特性、端部和负载条件、内置应力 和初始几何缺陷。目前的加拿大设计标准得到的研究并不支持 必然代表了现代大梁的设计和制造实践。过去实验的有效性 研究和相应的数值模拟由于依赖小规模测试而受到质疑 不再采用的样本和制造工艺。此外，很少有研究详细介绍 影响参数的量化。为了更好地了解现代焊接钢梁的稳定性， 设计师需要基于反映设计成员实际行为的数据改进指导方针 负载。我们的研究项目侧重于四个关键目标：1）彻底测量幅度和模式 现代制造和焊接过程中产生的残余应力； 2）到 根据以下因素的影响评估钢桥和建筑物中焊接梁的稳定性要求 残余应力； 3) 评估当前加拿大对工字型焊接钢的稳定性设计要求 大梁； 4) 为加拿大稳定性标准的变更提出设计建议 钢结构和桥梁设计的要求。为了实现这些目标，研究小组将进行 全面的实验室实验并采用数值建模。我们还将提供改进的设计工具 结构工程师的日常工作，从而使结构更安全并降低施工成本。