Design of extended & coped beam shear plate connections and welding of heavy plates and shapes

扩展设计

• 批准号: 431404-2012
• 负责人: Rogers, Colin
• 金额: $ 5.06万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=573989
• 关键词: Design; extended; coped; beam; shear

The proposed research directed towards improving the state of knowledge, design and detailing provisions in Canada of structural steel shear tab connections and of welded assemblies that utilize thick plates and heavy rolled sections. ADF Group Inc. and their engineers at DPHV have experienced difficulties in applying existing design procedures and have found potential performance issues with these connections and welded assemblies. Heavy rolled shapes, typically called "jumbo sections", with flange thicknesses exceeding 50 mm and built-up heavy shapes will be the subject of the first component of this research project. The recent fabrication by ADF Group Inc. of heavy steel plate built-up box columns that utilized 75mm thick steel plates and heavy rolled sections with doubler plates resulted in a significant number of cracked members that had to be scrapped and refabricated. The fractures occurred in the complete absence of service load, and were instead caused by either shrinkage stresses or by residual stresses on the thermally cut surface. The total industry loss was reported to approach $2M. Research to develop detailed recommendations on how to weld these heavy shapes is needed for different steel grades since their use is on the rise due to seismic and blast-resistant design in Canada. The second component of the proposed research addresses the behaviour and design of shear tab connections. The current design procedure recommended by the Canadian Institute of Steel Construction is limited to relatively small configurations with a single column of bolts. A lack of design guidance exists for beam-to-girder connections where either an extended shear tab or a coped beam-to-shear tab connection is used. The influence of axial load in the connection combined with shear is of particular interest. Testing of representative shear tab connections as well as material tests of the heavy plates and shapes will be carried out. This will be supplemented with finite element modeling of the shear tab connections to evaluate a wider range of loading scenarios and of welding procedures for the heavy sections. The general objective is to recommend design and welding procedures.

拟议的研究旨在改善加拿大结构钢剪切板连接和利用厚板和重型轧制型材的焊接组件的知识、设计和细节规定。 ADF Group Inc. 及其 DPHV 工程师在应用现有设计程序时遇到了困难，并发现这些连接和焊接组件存在潜在的性能问题。凸缘厚度超过 50 毫米的重型轧制型材（通常称为“巨型型材”）和组合型重型型材将成为该研究项目第一个组成部分的主题。 ADF Group Inc. 最近使用 75 毫米厚的钢板和带有双层板的重型轧制型材制造重型钢板组合箱形柱，导致大量裂纹构件不得不报废和重新制造。断裂发生在完全没有使用载荷的情况下，而是由收缩应力或热切割表面上的残余应力引起的。据报道，行业总损失接近 200 万美元。由于加拿大的抗震和防爆设计，这些重型形状的使用正在增加，因此需要针对不同钢种进行研究，以制定如何焊接这些重型形状的详细建议。拟议研究的第二部分解决了剪切板连接的行为和设计。加拿大钢结构研究所推荐的当前设计程序仅限于具有单列螺栓的相对较小的配置。对于使用延伸剪力板或顶部梁与剪力板连接的梁与梁连接，缺乏设计指导。连接中轴向载荷与剪力相结合的影响尤其令人感兴趣。将进行代表性剪切板连接的测试以及厚板和形状的材料测试。这将辅以剪切板连接的有限元建模，以评估更广泛的加载场景和重型部件的焊接程序。总体目标是推荐设计和焊接程序。