Plate Girder Analysis: Mastering Noncompact and Slender Webs with and without Stiffeners

Dive into the complexities of plate girders, focusing on noncompact and slender webs. This video builds upon our previous exploration of beam design, delving deeper into the intricacies of plate girders, especially in large-span scenarios.

We begin by contrasting standard hot-rolled shapes with built-up shapes from plates, highlighting their use in resisting larger bending moments. Discover the typical configurations of plate girders, including the common I-shaped welded plate girders and the torsionally superior box section. We cover critical design considerations like stability, local instability challenges, and the unique problems posed by deep, thin webs in plate girders.

Learn about the flexural strength derived from flanges, the impact of web buckling, and how to address diagonal compression in girders. The video explains the principles of tension-field action, comparing it to the behavior of a Pratt truss. We also discuss limit states, including yielding, crippling, and buckling, and how to counteract them through proper design.

The discussion extends to the design of welds in plate girders and the importance of understanding girder proportions for structural safety and longevity. We detail the criteria for categorizing webs as noncompact or slender according to AISC guidelines, including considerations for asymmetric sections like runway beams.

Finally, we set the stage for our next video, which will focus on calculating the flexural and shear strength of plate girders, selecting appropriate stiffeners, and analyzing bearing stiffeners.


🕒 Timelines:
0:00 - What are Plate Girders
01:40 - Why plate girders are different from standard beams
02:50 - Effect of high shear on deep girders
03:18 - How to avoid local instability
04:06 - What is tension field action
04:44 - What do concentrated forces do to the girders
05:24 - Welds connecting the plates
06:00 - How to proportion the girder
08:30 - Conclusion

Beam Design:
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