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目前的设计和详细说明结构钢连接的规定。代表美国钢铁制造商的ADF Group Inc.和他们的工程师(DPhV)对现有的剪切片梁节点的设计程序和潜在性能表示了担忧。同样，对于开槽的高速钢支撑连接，寻求一种更具成本效益和延性的配置，以及相应的设计方法。剪切片在加拿大各地普遍用于将结构钢梁连接到柱或梁构件。目前由加拿大钢结构学会(CISC，2006)推荐的设计程序仅限于具有单排螺栓的相对较小的配置。设计程序没有涉及使用多排螺栓、重载连接、扩展剪切板连接、连接中的轴向力和剪力组合，也没有解决在螺栓孔不对齐时采取的典型焊接翻新措施。在地震荷载作用下，开槽HSS支撑节点在反复非弹性循环变形作用下容易发生断裂。目前，为了解决这种失效模式，制造商必须加固这些连接，这大大增加了成本。需要一种改进的连接，以便在没有加固的情况下提供增强的非弹性性能。这项拟议研究项目的总体目标是为剪切片和开槽HSS连接制定改进的设计和详细的指南。这将通过完成广泛的测试、有限元分析和设计评估程序来实现。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、更具成本效益地设计和建造剪切片和开槽HSS连接。这将使ADF和钢铁行业与竞争对手的结构材料相比处于优势地位。最终，改善这些连接的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.