Improved design and safety of shear plate and slotted tube connections

拟议的研究项目是针对改善目前的设计和详细规定，在加拿大的结构钢连接。ADF Group Inc.，代表这个国家的钢结构制造商及其工程师（DPHV）对现有的设计程序和剪切翼片梁连接的潜在性能表示关注。同样，一个更具成本效益和韧性的配置，以及相应的设计方法，寻求开槽HSS支撑连接。抗剪翼片在加拿大各地普遍用于将结构钢梁连接到柱或梁构件。加拿大钢结构研究所（CISC，2006年）推荐的现行设计程序仅限于单排螺栓的相对较小的配置。设计程序未说明多排螺栓的使用、重载连接、延伸剪切板连接、连接中的组合轴向力和剪切力，也未说明螺栓孔未对齐时采取的典型焊接改造措施。在与地震荷载相关的反复非弹性循环变形下，开槽HSS支撑连接容易断裂。目前，为了解决这种故障模式，制造商必须加强这些连接，这大大增加了成本。需要一种改进的连接，其提供增强的非弹性性能而无需加固。本研究项目的总体目标是为剪切翼片和开槽HSS连接件制定改进的设计和详细设计指南。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翼片和开槽HSS连接件。这将使ADF和钢铁行业与竞争结构材料相比处于有利地位。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占用者和业主的安全。

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.