Improved design and safety of shear plate and slotted tube connections

拟议的研究项目旨在改进加拿大结构钢连接的当前设计和详细规定。代表该国钢铁制造商的ADF集团公司及其工程师（DPHV）对现有的设计程序和剪力板梁连接的潜在性能表示担忧。同样，对于开槽高速钢支撑连接，也需要寻求一种更具成本效益和延展性的配置以及相应的设计方法。剪切板在加拿大各地普遍用于连接结构钢梁到柱或梁成员。加拿大钢结构研究所（CISC, 2006）目前推荐的设计程序仅限于使用单排螺栓的相对较小的配置。设计程序没有解决多排螺栓的使用、重载连接、扩展剪切板连接、连接中轴向和剪切力的组合，也没有在螺栓孔不对齐时采取典型的焊接改造措施。开槽高速钢支撑连接在地震荷载作用下的反复非弹性循环变形下容易断裂。目前，为了解决这种失效模式，制造商必须加强这些连接，这增加了显著的成本。需要一种改进的连接，在没有加固的情况下提高非弹性性能。这一研究项目的总体目标是开发改进的设计和详细的指南，用于剪切片和开槽高速钢连接。这将通过完成广泛的测试、有限元分析和设计评估计划来实现。有了这些信息，钢铁行业的制造商和工程师，如DPHV将能够更准确、更经济地设计和建造剪切标签和开槽高速钢连接。这将使ADF和钢铁工业在与其他结构材料竞争时处于有利地位。最终，这些连接的改进设计程序和性能水平将有利于建筑物居住者和业主的安全。

The proposed research project is directed towards improving the current design and detailing provisions in Canada for structural steel connections. ADF Group Inc., representing steel fabricators in this country, and their engineers (DPHV) have expressed concern with respect to the existing design procedures and potential performance of shear tab beam connections. Similarly, a more cost effective and ductile configuration, as well as corresponding design approach, is sought for slotted HSS brace connections. Shear tabs are commonly used throughout Canada to connect structural steel beams to column or girder members. The current design procedure recommended by the Canadian Institute of Steel Construction (CISC, 2006) is limited to relatively small configurations with a single row of bolts. The design procedure does not address the use of multiple rows of bolts, heavily loaded connections, extended shear plate connections, combined axial and shear forces in the connection, nor the typical weld retrofit measures taken when bolt holes do not align. Slotted HSS brace connections are prone to fracture under the repeated inelastic cyclic deformations associated with seismic loading. At present, in order to account for this failure mode fabricators must reinforce these connections, which adds significant cost. A revised connection is needed that provides for enhanced inelastic performance without reinforcement. The overall objective of this proposed research project is to develop improved design and detailing guidelines for shear tabs and slotted HSS connections. This will be achieved through the completion of an extensive program of tests, finite element analyses and design evaluation. With this information the steel industry in general, fabricators and engineers such as DPHV will be able to more accurately and cost effectively design and construct shear tab and slotted HSS connections. This will place ADF and the steel industry in an advantageous position compared with competing structural materials. Ultimately, the improved design procedures and level of performance of these connections will be of benefit with respect to the safety of building occupants and owners.