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: $ 6.19万
• 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: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=654244
• 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 ** 载荷。此类主梁的设计通常由其稳定性决定;然而，各种参数可能 ** 影响其稳定性响应，包括横截面特性、端部和荷载条件、内置应力 ** 和初始几何缺陷。现行的加拿大设计标准得到了研究的支持，这些研究不一定代表现代大梁的设计和制造实践。过去的实验研究和相应的数值模拟的有效性是值得怀疑的，因为它们依赖于小规模的测试 ** 标本和制造工艺，不再实行。此外，很少有研究包括详细的 ** 量化的影响参数。为了更好地理解现代焊接钢梁的稳定性，设计人员需要根据反映设计荷载下构件实际行为的数据改进指南。我们的研究项目集中在四个关键目标：1）彻底测量现代制造和焊接过程中产生的残余应力的幅度和模式 **; 2）根据残余应力的影响 ** 评估钢桥和建筑物中焊接梁的稳定性要求; 3）评估目前加拿大对I形焊接钢梁的稳定性设计要求; 4）为钢结构和桥梁设计中加拿大稳定性要求标准的变更提出设计建议。为了实现这些目标，研究小组将进行 ** 全尺寸实验室实验，并采用数值建模。我们还将为 ** 结构工程师的日常工作提供改进的设计工具，从而使结构更安全，并降低建筑成本。