Special Vertical & Lateral Load Considerations for Steel Joists & Joist GirdersAIA HSW
Stuart, P.E., S.E., F.ASCE
This one hour online course will provide the user with an understanding of the special design considerations necessary when dealing with unusual vertical and horizontal loads on steel joists and joist girders. This course includes a multiple choice quiz at the end.
At the conclusion of this course, the student will:
Often in the course of the design of a joist, loads in addition to uniform vertical gravity loads are imposed on the member. In such a situation, for an engineer to be able to select the appropriate member size or specify the correct load resisting performance of a joist, the designer must be able to properly interpret the manufacturer's allowable load tables and member capacities for both shear and moment. This course will guide the engineer through that process.
The design of the overall stability of a building involves an understanding of the load-path mechanism that distributes the imposed wind or seismic loads from the cladding to the foundations. Steel joists and joist girders are limited in this regard. This course will help guide the engineer through the understanding of what these limitations are.
The course content is contained in the following PDF file:
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The designer must compensate for non-uniform loads on joists by developing the shear and moment diagram for a particular member in order to establish an equivalent uniform load for use in selecting a standard joist or specify a KCS series joist. A third alternative involves the development of a loading diagram to enable the joist manufacturer to design and fabricate a special joist for each load case.
Lateral diaphragm collector and chord forces must be transmitted between the metal deck and the lateral resisting system via the joist or joist girder member chords. Standard joists and joist girders have limited capacities available to accomplish this goal. Special detailing provisions may be required when the member bearing seat assembly is not capable of transferring the magnitude lateral loads involved.
You can download a program from Vulcraft's website called Vulcraft Assistant that helps you design joists with concentrated loads (http://www.vulcraft-in.com/). The program does not do any deflection calculations.
Once you finish studying the above course content, you need to take a quiz to obtain the PDH credits.