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# Engineer22

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Intern
1. ## Structural Spans

1) Can anyone clarify the spans for the following systems? Concrete T beam One Way Slab Pan Joist These are confusing me. And would they all be used for heavy loads? 2) What would be the best system for 20' span in commercial building? A) Steel Decking and Concrete --> I believe these can go upto 15' but can span farther if deeper B) Glulam --> 25'-65' C) Wood Joist --> 25' D) Wood I joist --> 45' E) Waffle Slab --> 40' Are my above spans correct? If so, I'd say the answer Is A.
2. ## Foundation Settlement

Also, please ignore the uniform load, and look at my sketch above: there should only be one point load downwards at 3, with 4 fixed columns, and 3 experiences settlement.. I've received a variety of answers, so I am stumped.
3. ## Foundation Settlement

That makes alot of sense bassplayer! Thank you for the visual analogy. Yes, all fixed.
4. ## Foundation Settlement

Settlement at 3 would lead to increased negative bending moment at 2 or 4 then? I am having a difficult time picturing this. I think it would lead to increased negative bending moment at 2 and a smaller negative bending moment at the right (3).
5. ## Foundation Settlement

That makes sense about creating the moment diagram and then evaluating! What if you have the attached condition? Downward load only at 3. In this case, which has the increased negative bending moment? 1, 2, 3, or 4?
6. ## Foundation Settlement

Thanks Bass! Julie, there's just a column at 4.
7. ## Foundation Settlement

Assume R3 is column 3. Thank you.
8. ## Foundation Settlement

IF column 3 experiences settlement in this question, what will happen? I am torn between a larger negative bending moment at either 3 or 4.

Can you clarify: would your answer would be electricity for heating water?
10. ## F= M x D

The problem statement is to solve for X, given the three variables that are already provided (50, 100, 12'). No reaction forces needed, I think? Would the way you have shown, can it be done about the left point and still yield the same answer? About left point, it is 100' x [x/2] = 50 x 12 ? (No negative or clockwise moments in this case?)
11. ## Structural System for Lateral Resistance

This is helpful, thank you so much! If there wasn't a tall or short building specified, which one would be best... I know this is arbitrary but this is the question I've been presented with