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

拟议的研究旨在改善加拿大对结构钢抗剪翼片连接以及利用厚板和重型轧制型材的焊接组件的知识、设计和详细规定。ADF集团他们在DPHV的工程师在应用现有的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。重型轧制型材，通常称为“巨型截面”，凸缘厚度超过50 mm和组合重型型材将是本研究项目的第一个组成部分。ADF Group Inc.最近的一项调查显示，使用75mm厚钢板的重型钢板组合箱形柱和带有双层板的重型轧制截面导致大量开裂构件，这些构件必须报废和重新制造。断裂发生在完全没有工作载荷的情况下，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，该行业的总损失接近200万美元。由于加拿大的抗震和防爆设计，这些重型钢材的使用正在增加，因此需要研究制定关于如何焊接这些重型钢材的详细建议。建议的研究的第二个组成部分涉及剪切翼片连接的行为和设计。加拿大钢结构研究所推荐的现行设计程序仅限于相对较小的配置和单柱螺栓。对于梁与梁的连接，无论是使用延伸剪切翼片还是使用带帽梁与剪切翼片连接，都缺乏设计指南。轴向荷载与剪力相结合的影响是特别感兴趣的。将对代表性剪切翼片连接进行测试，并对厚板和型材进行材料测试。这将通过剪切翼片连接的有限元建模进行补充，以评估更广泛的负载情况和重型部分的焊接程序。总体目标是推荐设计和焊接程序。

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.