I've inherited a model that was built using inches as the base unit. But I've found problems with that when analyzing the section properties, etc. And it appears to be the case with the current model I have.
Is there a fairly easy way to just scale down the model x1/12 so I can change all the...
I've received a client request that I've never been asked to look at before. A fellow engineer said that it was "just a number" and didn't really represent anything in the real world.
CLIENT REQUEST:
Provide calculations for soil settlement due to dynamic load conditions.
I'm going to guess...
For reasons I can't discuss, we have an extremely large box culvert with a 2' thick wall (all around). This box culvert is large enough to drive a car through. When applying load to any of the four planes, I'm wondering how one would take into account the corners.
Say the box is 10' wide on...
My team was given a cryptic message about our design from the design manager. And we won't be able to discuss with him for another day.
Design:
Concrete beam: 4ft x 3ft(H x W) with a 70ft clear span.
30kip load hanging down from an embed plate at the bottom of the beam.
Embedment uses Nelson...
I'm thinking that the project specifcations team has not looked at the load path carefully enough. But maybe I'm missing something.
[ol 1]
I have an embed plate that has an array of nelson studs welded to it.
The studs are embedded on the underside of a concrete structure.
On the underside of...
Why are there two sets of values for Cp in Figure 27.3-1 (Continued)?
I can understand if there is a positive or negative. But when they are both negative, I cannot conceive of a situation where the lower negative value (closer to zero) would govern.
I tried asking Bentley this question and they never answered.
I've noticed that if I use a triangular plate in a STAAD model, the resulting plate stresses are unusual. For some reason, a few of the stresses are completely uniform. All three corner stresses and the center stress are all the...
I had believed that the rebar development length formula was only for standard rebar with standard deformations. The psai (sorry, I can't type Greek letters) factors take into account epoxy coated rebar for a lower friction coefficient. So, I'd think that any other deformations would also...
I just got onto a project with a team with very different backgrounds than I'm used to. Different countries and different codes all seem to be clashing. So, I need some consensus on a particular issue.
We have a large, rectangular concrete tunnel. Don't ask why they didn't make it round...
I have a question about the STAAD plate stress axes.
I have a large box culvert that is of unusual dimensions with unusual load conditions.
I've modeled it with plates. At one reentrant corner (the box culvert takes a 90 degree turn) I see a high stress concentration when I place the load...
For sidewalks, roadways, and general area paving, I've always used the term "Control Joints" for those cuts, scores, indentations, etc. that we place periodically to control surface cracks of concrete.
I've just now heard of the term "Score Joint." I guess it makes sense -- especially with...
I've spent much of my career in site work. And it has been ages since I did municipal or transportation projects. So, I'm wondering if I have a faulty memory or if I'm remembering right.
I am in the process of writing new standards and design guides for my company. This is a guide for plant...
We have a retrofit column on a really thick piece of concrete with a WHOLE LOT of rebar. We're limited on space. And the original installers were not that careful about the rebar placement.
1. The contractor told me that as he was drilling into the concrete, the bit got stuck on some rebar...
I've never had this happen before. I'm wondering if anyone had this happen.
I've just done a hand calculation of the drainage before and after development.
Factors:
1) I used the rational method to determine Qp.
2)I started off with about 15% prairie and 85% Forest.
3)I have 15% impervious...
I've got a subdivision
The drop from one side of the subdivision to the other is only about two feet.
My calcs show that the required detention would be about 5.4 acre-ft.
Basic math then says that I need detention to be 2.7 acres.
This means I'm giving up two entire lots worth of area in a 27...
AISC Appendix 7. Paragraph 7.3-1(b) gives a condition of using the first-order method: You have to compare the 2nd order drift to the first order drift.
I'm having trouble understanding why you'd go for the first-order method if you have to do the 2nd order method to verify that you don't...
I've looked at the dozen or so threads on notional loads and I still need to ask this question to see if I'm reading everything right.
I'm looking at Eq A-7-2 (AISC 360-16). I'm guessing that the 2.1 was some form of factor of safety from AISC. (0.002 x 2.1 = 0.0042 which is the minimum per...
In seismic design, we use Tables 11.6-1 and 11.6-2 to categorize SDC. But I just noticed a quirk I hadn't noticed before. And it generated a question.
Sds = 0.32 (SDC B)
Sd1 = 0.20 (SDC C)
Normally, I'd just pick the higher classification and go with that. But I just noticed that when...
What exactly constitutes "cold weather" from a steel perspective? There has to be a transition line.
I'm looking at a project where lowest ambient temperature is specified as -15C.
Some projects are only specified as low as -5C.
Others are as low as -30C.
Most of the 48 states experience...
I'm looking at AISC J3.10, Eq J3-6 (a,b) for bearing strength. Is there a reason no mention of threads is included in this analysis?
It would seem to me that if the bearing occurs at bolt threads, it would have a tendency to have more deformation in the member steel. Or does this equation...
