Cantilever Beams Walded to Flange of W Section

[noengr]

The length of an end beam (girder) is 42' and has 10 cantilevered HS members framing into it the web. The questions are:
1. Should the loads from the HS members be treated as point loads, moments on the flange or both?
2. Should the girder be designed for compression, flexure or shear?
Thanks for your assisance. Any reference manuals and web sites would be greatly appreciated

 

[BAretired]

Draw a sketch.

BA

 

[SLTA]

Out of curiosity, what is the application for this? Or is this a homework problem?

 

[noengr]

I began design based on weak axis flexure and shear in the flange. I am not sure about torsion. Attached is a sketch. Thanks for the response.

 

[noengr]

It is the design of a canopy/ overhang. Does the application have a bearing on the design.

 

[noengr]

I tried to attach the skecth with the previous post. Hope this works

 

[Teguci]

Local torsional loads - thats a fun one!

 

[hokie66]

Torsion is not handled well by open sections. Depending on the magnitude of forces on the outriggers, you probably need to do something else.

 

[dhengr]

noengr:
The best advice and help we can give you here is to suggest that you get a couple text books on strength of materials, structural analysis and steel design, and a building code, and study them. Also, you should go to your boss with these kinds of questions so he can give you immediate guidance and direct your progress, so you don’t get yourself or him in trouble, due to inadequate understanding of what you’re doing.

Imagine the following.... We are not looking at the plans or sketch you have in front of you, so we know nothing about your problem. Now, read your description and questions, and imagine that for every person who reads your post, the multitude of possible sketches they might draw from your wholly inadequate description. Thus, the need for a sketch with some dimensions, loads, reaction points, etc. etc., so you are actually more fully describing your design problem. And, yes the actual application is important to the design. Snow loads, ice loads, wind loads are all important on a canopy design and would be less important on a pipe rack in the building. You may have 10 HS cantilevers in 42' of end beam; but does your audience know what HS or end beam means to you, they may mean something else to others, unless you are more specific. And, I’ll bet your end beam doesn’t span 42' without any supports, which will be affected by your canti. loading.

In short you must understand your own design problem well enough to ask meaningful questions, and give sufficient info.; or your own boss or company should know your limitations and experience level, so they can guide your development properly.

 

[noengr]

Thank you.