Plate girders are custom I sections that are built up using welded plate steel. Plate girder webs are usually designed to be thin to keep the overall weight down, which makes them susceptible to elastic buckling under low shear forces. For this reason, girders are often furnished with stiffeners, which results in different mechanisms contributing to their shear resistance. Stiffened webs are also susceptible to shear-moment interaction.
This mini course covers the design of plate girder webs and selection of transverse stiffener spacing for shear. The mechanisms that contribute to the shear resistance of thin webs with and without stiffeners is discussed. The Basler model for tension-field action is reviewed and developed to the form of the shear resistance equations found in CSA S16 and CSA S6 today. Shear-moment interaction is briefly discussed. The topics are explored in representative examples, and comparisons are made to the provisions in AISC 360 and AASHTO LRFDBDS for stiffened webs.
Learning Objectives
After taking this mini course, you should be able to:
- Describe the mechanisms that contribute to the vertical shear resistance of slender plate girder webs and how they are considered in the Basler model
- Calculate the factored shear resistance of slender plate girder webs using CSA S16:24 for buildings or CSA S6:25 for bridges
- Select a stiffener spacing to provide an acceptable factored shear resistance and meet maximum spacing requirements in CSA S16:24 and CSA S6:25
- Account for the effect of shear-moment interaction on the factored shear resistance of a web panel relying on tension field action using CSA S16:24 or CSA S6:25
- Compare the CSA S16 and CSA S6 standards to the AISC 360 and AASHTO LRFDBDS specifications used for building and bridges applications, respectively, in the United States.
Organization & Duration
To complete this mini course, you must watch the 1-hr webinar and finish the 5-question quiz. You must get each quiz question correct to move to the next, and you’ll have unlimited attempts at each question.
You will have 90 days from the date of registration to complete the mini course.
