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treyjay

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About treyjay

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    Professional Engineer

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  • Engineering Field
    Construction Engineering
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    PE
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    Civil

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  1. maybe I am misunderstanding what you are saying, but if a wall is 100' long and a bar is spaced 12" OC, then there would be 101 bars because you would have to count the first one placed at the start of the wall.
  2. you will need to know things like slabs are floors. that they are usally placed on a crushed aggregate, but they can be poured straight on the dirt in a pinch. also you can put rebar in them or maybe wwf. be sure that you know that slabs are made of concete....that is highly likely to be a test question. I wish I could tell you more, but you can always try calling NCEES and asking them, because they write the exam and would know better than anyone.
  3. always check to see if Cc & Cw apply. always check Pmin = 600Cw always check Pmax = wh (full liquid head), which cannot be exceeded.
  4. It looks like Lindeburg is considering the present salvage value as a present cost under the old option. This would make sense if the old option is selected because the salvage value would not be recovered and would have to be expensed some way since it was being treated as a "salvage" value. It would not be a complete analysis of the old option if the salvage value was not considered there. So, I think that Lindeburg is technically correct. On the other hand, you treated the old option present salvage value as a deduction to the new option replacement cost (the value of the scrap), which is what would happen in the real world if the new option was selected. I think this is a case where either way gets you the correct answer as long as nothing is double counted.
  5. thanks for the response...that was very interesting. sounds like some high level welding applications for these types of guys...more than your typical "special inspection" requirements where the CWI inspects and the testing lab PE signs off. again, thanks for the info.
  6. I dont know anything about it other than what is on the AWS website, but I would be interested in knowing why your company feels this is something you need if you are already a PE? from what I know, being a certified welding engineer just seems like a way for someone who can't qualify as a PE to be called an engineer. what does being a CWE do for you in addition?
  7. the const. load is added when the shores, forms & concreteing is taking place.
  8. I don't want to sound like I am putting you down, but if Problem #119 of 2011 NCEES Construction Sample Exam is getting you hung up, you better really start to focus & concentrate. this problem is an FE type of question. it is a strengths of materials topic and doesn't have anything to do with being a structural guy or not. you are trying to find the largest moment of interia and you need to use the parallel axis therom. like I said, I dont mean any disrespect, but this is basic stuff.
  9. without having the full question, it is hard to reply. in these econ questions, one word can change the entire answer. salvage value could be a cost if that is what it takes to demolish the bridge.
  10. the NCEES example problems I have seen usually involve a frame with w, d & l loads applied. the questions ask for the "worst case" loading causing uplift. if you think of these in a manner similar to overturning questions on retaining walls, you will look for the "tipping point." if the w+d+l loads add to the overturning, they then cause the worst case loading and you have your answer. if the live load adds to the resistance to uplift, then you discount the live load, because it is a variable load and cannot be counted on being there.
  11. I had a chance to review the new 6 Minute Solutions for Construction that just recently came out. I did not work any of the problems, but I read over them fairly closely. For anyone taking the construction exam, I would highly recommend that you get the book and work all the problems....it is very representative of the types of problems you might see and how to use the NCEES references.
  12. the answer is C, but you don't use the live load because you cannot count on the live load being there. if the live was there, it would increase the uplift resistance.
  13. I dont think that 160 plf is a weight. It is the wind force per foot on the wall form (20 psf x 8 ft brace spacing). the height of the form is 16'. the resultant of the wind is (160 x 16) acting at 16/2 in the horizontal direction.
  14. the tower crane problems are not as hard as they look....you need to be able to determine every moment generated by the main crane components, the load and the foundation....all you have to remember is overturning moments vs. resisting moments. since these moments will have to sum to zero and there will be at least one moment containing unknown the footing thickness (usually denoted "t") you can solve for the footing thickness....easy. it helps to convert the weights given in these problems to kips to keep the number of numerals to a minimum because a misplaced decimal or dropped digit is the hardest thing to keep straight with these problems. I would not try to memorize a "plug & chug" formula for this because the crane configurations and the applied loads can vary a lot. you just have to learn to recognize what is a overturning moment & what is a resisting moment.
  15. well....they don't pity us so much that they don't want us staging our military there to protect them from China now do they? maybe they thought they were just giving you back some of your tax dollars. I am sure they love you there...or maybe they are thinking "hey...another American capitalist who pimps himself out for a buck" for a guy who describes himself as "selfish" and who is all "about the money"...I bet you are a free-trader too. I hope you get back there...fast.
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