Modern Steel Construction
Do you know what type of shape these designations refer to and where I can find information about the geometric properties?AB designations refer to the American Bridge Company, which fabricated shapes called “Constant Dimension Columns” designedby the American Bridge Company (see Figure 1). These columns are not rolled columns but rather were created by combining plate
and angles. Milo Ketchum’s Structural Engineers’ Handbook, which provides a list of section sizes, including the three shape designations you provided as an example, in Table 162. The properties provided include the size of the web plate and four angles used to create the constant dimension columns, the weight, the strong and weak axis section modulus, and the radius of gyration.
I have a question regarding end-plate stiffeners in bolted
extended end-plate moment connections as covered in AISC Design Guide 4: Extended End-Plate Moment Connections Seismic and Wind Applications. In the calculation procedures covered in the design guide, I do not see where the addition of stiffener plates would reduce the end-plate thickness. I also would like to know what percentage of the beam flange force goes into the stiffener as I could not find guidance on this either.
The stiffener plates were considered in selecting the yield line patterns used to derive the equations for Yp The stiffeners are designed according to Equations 3.15
and 3.16. The load distribution at the plate edges will change with the load level. Generally, the actual stresses will likely be highly nonlinear at lower loads and become more uniform with stress redistribution due to yielding at higher loads. The design guidance for these connections is intended to provide adequate ductility to allow for this stress redistribution without buckling or rupture.Although not required for end-plate connections designed according to Design Guide 4, I have developed a method to calculate the force along each edge of a rectangular yield line
pattern. An article on it, “A Yield Line Component Method for Bolted Flange Connections,” appears in the second quarter 2011 issue of Engineering Journal.
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