Development of generalised design procedures for steel extended shear tab connections

抗剪翼片是传统钢框架结构中最常用的抗剪连接之一，因为其结构简单且成本相对较低。对标准剪力翼片进行了大量的研究，其中连接偏心率较小，且剪力翼片固定在相对刚性的支撑件上，例如柱翼缘。因此，标准抗剪翼片的设计方法已经得到了很好的建立，并且在钢结构中经常使用。然而，可用于扩展剪切翼片设计的信息少得多，这是可取的情况下，接头可以简化通过延长板保持螺栓连接区域清除任何障碍，清洁接头配置和简单的安装技术。 两种最常见的情况是，当梁连接到柱腹板或梁腹板时，需要使用延伸的剪切翼片。在这些情况下，较长的剪切翼片清除支撑柱或梁的凸缘，从而避免了为了装配目的和为了便于在现场架设梁而对梁凸缘进行处理的需要。延伸剪切翼片可以通过将翼片的顶部和底部边缘连接到支撑构件的水平板元件（连续板或凸缘）来加强。 拟议的研究计划作为其首要目的的发展，更好地了解扩展剪切片的行为和可能遇到的潜在极限状态。这将通过全面的实验研究来实现，该研究包括各种连接几何形状和负载条件，并以统一的方式评估所观察到的连接性能。第二，但也是非常重要的，目标是鼓励在传统的结构钢结构连接的成本效益，提供了一个推动力，促进增加使用的非加劲版本的扩展剪切标签。

Shear tabs are one of the most common shear connections used in conventional steel-frame construction due to their simplicity and relatively low cost. A significant amount of research has been done on standard shear tabs, where the connection eccentricity is small and the shear tab is affixed to a relatively rigid support such as a column flange. As such, design methods for standard shear tabs are well-established and they are used routinely in steel structures. However, far less information is available for the design of extended shear tabs, which are desirable for cases where joints can be simplified by extending the plate to keep the bolted connection region clear of any impediments to clean joint configurations and simple erection techniques. Two of the most common situations where extended shear tabs are economically desirable are when connecting a beam to a column web or to a girder web. In these cases, longer shear tabs clear the flanges of the supporting column or girder and thereby avoid the need to cope the beam flanges for fit-up purposes and for facilitating erection of the beam in the field. Extended shear tabs can be stiffened by connecting the top and bottom edges of the tab to the horizontal plate elements (continuity plates or flanges) of the supporting member. The proposed research program has as its overarching purpose the development of an improved understanding of the behaviour of extended shear tabs and the potential limit states that may be encountered. This will be achieved with a comprehensive experimental investigation that includes a variety of connection geometries and loading conditions, and evaluates the observed connection performance in a unified way. A secondary, but also extremely important, goal is to encourage cost-effective connections in conventional structural steelwork, providing an impetus for facilitating an increased use of the unstiffened version of the extended shear tab.