Hi Mike,
That is not at all what I meant. I agree that mentoring is a very valuable experience for those of us that are able to receive it. And I do agree with many others that our younger engineers are not mentored as they should be, if at all... It seems now the trend is to throw young...
atlengpe,
That is one of the most ridiculous things I have heard in a long time. I don't know the OP's situation, but seriously, failing the PE exam 4 times? C'mon, something is wrong. Did you notice that his discipline is "structural"? What if he lives in one of those states where being a...
I don't have an answer for you off the top of my head, but for buried structures under the AASHTO code, you can ignore live loads for fill 8 feet deep and greater. You can also take an increasing reduction for fill 2 feet to 8 feet deep. Maybe based on the depth of the pipe below grade, you can...
PMR06 brings up sum interesting points. Have you considered possibly using a heavy duty pre-deflected Simpson holdown horizontally at each end at the bottom side of the existing rafters and using a 1/2" or 5/8" rod to tie the two together. Or possibly clevis and turnbuckle at each end with a...
Hmmm. Makes sense. I have never lived in or worked on projects in areas with snow -- the thought never crossed my mind. Still yet, seems like a lot more work for the contractor to retrofit the rafters than to than to just throw in more supports and anchor the system at each rafter. But I guess...
Unless the rafters are deteriorated or damaged in some way, I don't quite understand why you would need to beef them up to support solar panels that, along with the racking system and mounting hardware, weigh probably less than 5 psf. Based on your sketch, your concern is obviously not uplift...
I think what you are doing is very valuable experience. You are just too inexperienced to realize it. What you are doing is very helpful to help you learn how to organize a set of drawings. Instead of just picking up mark-ups, you need to also keep your eyes open to how the drawings are actually...
I do believe that the various bearing pressures for the different limit states are derived from a single value, and I think it is the ultimate bearing capacity. I believe Chapter 10 of the AASHTO LRFD goes into detail of how geotechs determine the different factors to derive "service," "limit,"...
Is this a transportation project? "Service" and "Strength" limit states are specific limit states defined in the AASHTO LRFD Bridge Design Specifications. There is one other specific limit state, the "Extreme Event" limit state which is to be used for seismic design. The fact that the geotech...
SEISMIC DESIGN...
I forgot to mention, just in case you have not accounted for it. IBC requires seismic design of cantilevered earth retaining walls. IBC 03 Section 1622.1.2 requires seismic analysis of retaining walls. You will need to find k_h (use Mononobe-Okabe equations, or better yet have...
Hi RCraine,
I quickly breezed through the previous responses, and it sounds like you have everything covered. I just want to point out a couple of things I noticed from your sketch. I do understand that this is a rough sketch and your original post was focused on trying to get the summation of...
I'm not familiar with the text you are referencing and have not seen the full sample problem, but I am guessing that they are dividing by 2 feet because the bars are at 24 inches on center. This will give you a solution in Area of Steel (or Moment Capacity, depending on how you are looking at...
Westheimer,
Any experience in land surveying would be invaluable experience. No matter if as a rod man for a year or two, or if you stick with it for 4 or 5 years and earn your PLS. As a principal in a very successful mid-sized structural engineering firm that does both bridges and new building...
