I'll try and keep this short.
A contractor was awarded a project involving a metal building ("pre-engineered"). The design of the building frame was subcontracted to a metal building manufacturer, and foundation design (micropiles) was subcontracted to a drilling company, who subcontracted the...
I'm designing a rectangular concrete tank and I'm working through the seismic loads per ACI 350.3-06. I have the various dynamic forces calculated from Section 4.4.1.....Pw', Pr, Pi and Pc. What is stumping me is the consideration of "Peg" in the base shear calculation. "Peg" is the lateral...
I need advice relating to the Certificate of Authorization (COA) and Firm Permits that various states require.
I am licensed in PA, MD, WV and VA. All of these states, with the exception of PA, require some form of business registration with the State Board in order for the company to practice...
I'm designing a block foundation for a centrifugal mine fan. The preliminary sizing for the main block is 37' long x 15' wide x 5' thick. On top the block, there are two pedestals roughly 6' tall - one supports the motor and drive bearing,the other supports the non-drive bearing. (There's a...
The company I work for (design/build construction company) will be bidding the design, fabrication & construction of a 30' diameter x 19' tall water tank (100,000 gallons) for a coal plant. Most likely, since I specialize in structural steel & reinforced concrete design, I will be recommending...
The company I work for has decided to fill a niche in our area by building precast concrete well cellars. These well cellars are essentially a four-sided box with no top or bottom that are buried in the ground to provide access to gas well heads.
First of all, we're not a certified precast...
I'm designed a concrete "well cellar" for a gas company. This well cellar is a four-sided box with no top or bottom and is buried it's entire height (top flush with surface). The inside plan dimensions are 8' x 6', and the height is 8'. I'm trying to determine the induced stress on the face...
We're quoting a project that will require a temporary retaining wall to allow for construction access. This temporary wall will be nearby a railroad, and the geotech has recommended that the CSX Cooper E80 Railroad load be applied to this wall (in addition to the typical active soil pressure)...
The company I work for has decided to try and build "standardized industrial buildings" that will primarily be used to house electrical panels and will be small enough to be shipped whole. (Let's ignore the fact that they have been building them for some time now without any engineering review...
Alright.....this is driving me nuts.
I'm designing a simple square mat subjected to eccentricity in 2 directions and I'd like to permit partial uplift for the load condition, as long as the bearing pressure stays within reason.
First....imagine a basic square/rectangular footer pad subjected...
This happened in my neck of the woods last night:
http://www.wjactv.com/news/features/features/stories/web-extra-w-pa-wind-turbine-falls-ground-1209.shtml
Although it's from a distance, it looks like a possible group anchor failure (cone). There's a clean cone of concrete still attached to...
We have been contracted as the design-build contractor for a sand plant project that consists of stacking conveyors, screen towers, etc. Originally, this was going to be a "flagship project" for the customer......everything was going to be top notch. After they got the estimate, it quickly...
We're designing a bulkhead (58' wide x 30' tall) for a large volume, low pressure Howden mine fan. The operating pressure for this fan is less than 1 inch of H20 (5.2 psf). The customer doesn't have any information on blasting pressures unfortunately. Obviously I need to talk with the...
The company I work for has started to make a few customized platforms for the oil & gas industry. The platform, when fully assembled, supports a centrifuge and provides access to the centrifuge. The handrail surrounding the platform is removable for shipping purposes, so during initial setup...
Just as the title of the thread suggests. I've always used Fig 29.5-3 since I figured that a "trussed tower" sounded more appropriate for a box truss. However, I suppose "lattice framework" sounds similar too (Fig 29.5-2), plus it gives lower Cf values. Unfortunately, ASCE doesn't give much of...
Just as the title of the thread suggests. I've always used Fig 29.5-3 since I figured that a "trussed tower" sounded more appropriate for a box truss. However, I suppose "lattice framework" sounds similar too (Fig 29.5-2), plus it gives lower Cf values. Unfortunately, ASCE doesn't give much...
I've been given the task of evaluating a conveyor tube gallery (9' dia., 175' span, 1/4" shell, approx. 182' in the air) that spans over a major highway in WV. The state is requiring the customer (coal mine facility) to have a PE evaluate the safety of the tube and it's support tower (182'...
I'm about to start a engineering review of an existing 9' diameter tubular conveyor gallery that spans approximately 176'. Design references for such a structure are hard to come by. Here's what I have in my personal library:
1. "Tubular Steel Structures - Theory & Design", M.S. Troitsky...
I have an interesting problem. It's something that I haven't dealt with before, but perhaps some people on here who typically deal with commercial wood designs can steer me in the right direction. It's a bit longwinded, but here goes.
First off, my specialty is industrial steel structures. I...
I'm using ASCE 7-10 to calculate the seismic loads acting on a structure. The structure is a moment frame (OMF) that supports an elevated bin that stores fly ash. Based on this useage, I classified this structure as a "nonbuilding similar to a building" (Chapter 15 provisions). I came across...
