Hi everybody,
Well, I'm stumped. I have an architect that wants to connect two tension rods that form the bottom tie of a roof system to a central hanger using a 4" diameter pipe section that is 2" long. He wants the rods to connect through the wall of the pipe and washers and nuts on the...
I am designing a barrier wall for an existing parking structure. The contractor would like to cast a perimeter wall on top of the precast plank hollow core deck. Does anyone have a good detail they can share for embedding the vertical reinforcing bars into the planks? The bar will have to be...
I have been tasked with analyzing a mat foundation of a rectangular concrete tank (about 130'x125'x16' tall). The issue is half the tank will be filled during service and rock anchors are installed along nearly all the wall locations (including interior walls) to guard against buoyancy. The tank...
I have a client that would like to completely fill a 8'x8'x8' cell in an existing multicell tank and cap it with a reinforced concrete slab. The cell shares two walls with neighboring circular tanks on opposite walls. The other two opposing walls are straight. The intention is to fill the void...
I've recently read through the many discussions already present on this topic in reference to both ACI 318 and, more relevant for me, ACI 350.
I'm currently designing a tank with certain walls that require very little steel for flexural strength (#5@12" or so). Unfortunately, the requirement...
I'm currently using the PCA manual to analyze the capacity of an existing tank per ACI 350. The client would like to expand the capacity of the current tank as much as is possible by adding height to the walls. My plan is to determine the actual capacity of the current tank and give them a...
I am looking for some information on typical lintel designs for post-installed, large round openings in masonry walls. My particular wall is an exterior cavity wall of 12" stacked CMU with standard face brick. The opening is for ductwork for HVAC improvements. The architect wants me to design a...
I could use a little guidance concerning a Post-Frame Building analysis. I am looking at doing an analysis with the sole purpose of finding post reaction loads. The posts will be connected to a concrete knee-wall that runs the perimeter of the building. I've see in the NFBA manual a type of...
I've posted this in Structural already but really would like some foundation/soils people to comment too:
I am reviewing the sliding stability of a 16'x14'x17'-deep concrete tank. Essentially, it will need to behave as a retaining wall during a possible future installation of an adjacent tank...
I am reviewing the sliding stability of a 16'x14'x17'-deep concrete tank. Essentially, it will need to behave as a retaining wall during a possible future installation of an adjacent tank. There will be full height soil on one side and full excavation on the opposite side of the tank.
When I...
I'm looking at analyzing some precast elements that are being used in a below ground tank used to hold manure. The livestock walk on the precast slatted panels and the manure finds its way into the under barn tank. Technically, the precast beams/column/panels are not exposed to weather but I...
My company frequently designs structures with a thickened edge slab supporting the exterior walls of the structure. Recently I was asked to size this thickened edge for a structure that had posts spaced 8-ft on center. I have yet to find a reference for this type of situation. Typically, the...
Is there a reference for the design moments and shears resulting from 1) A distributed load and 2) Two equal concentrated loads (moving) on a two span continuous beam? The spans for my case are equal.
I did some searching around and haven't found anything. This seems so basic I just thought...
I have a rectangular concrete slab on grade that will need to take a uniform edge compression load. The load is about 1k/ft and the slab dimensions are about 10'x35'. The slab's sole purpose is to take this compression load and act as a surface to cast a structural slab against. It is desired...
I was tasked with designing a concrete wall that has a bench projecting out from the side of it. They would like the face of the bench to extend to the ground. Essentially, an 18"x18" cross section of concrete that projects from the side of the wall face that people will sit on. The concern is...
I've been informed that the contractor is hitting 6-7" diameter rocks during the installation of the sheet piles for a braced excavation I've designed. They would like to essentially not drive the piles to the required depth.
The braced excavation is roughly 7 feet deep and the piles should be...
Hi all,
I am looking at analyzing a precast waffle panel (8'x12') with 5 longitudinal ribs (spaced at 2') and four transverse ribs (spaced at about 4' o/c over the 12' span). The panel needs to be designed for drive-over wheel loads and I'm having a heck of a time finding a distribution model...
Hi all,
I designed a braced excavation (sheet piles with walers and interior struts) and I've just been notified that the utilities that weren't supposed to interfere are now an issue. Basically, they may need to connect the new 4" utility pipe and have it run through the braced excavation...
Okay, is there any difference at all in the values that these variables represent? And, if so, what is it? I've searched and searched for some sort of example showing the calculation of these but every design example just assumes they are already calculated so I can't verify if there is any...
