California Building Code section 1803.3 requires 5% min slope away from the building foundation or 2% min for impervious surfaces. I have some guesses, but does anyone know for certain the rationalization behind this? Can this required minimum not be met (say 1% for concrete paving) and still...
Are there any IBC requirements to test post-installed epoxy anchors in concrete? The anchors were design per ACI 318 App D. If not, any ideas on what to specify for a testing procedure and a test load? I would assume the test load would be based on the required and/or design capacity?
Thanks in...
I am working on a small residential project that will require re-working a bit of the driveway. Existing driveway is ac paved with a slope of about 19% and I'm concerned about vehicle grip. What is the best way to ensure good roughness on new AC? Is there any data supporting roughness anything...
I am hoping someone may be able to clarify why ACI 360R-06, section 5.4 suggests that semi rigid epoxy provides sufficient shoulder support for joints subjected to wheeled traffic and discourages the use of elastomeric joint filler? Any knowledge gained from practical experience would also be...
I am checking the capacity of an existing timber bent frame with mortise and tenon connections. I would think you would get some contribution from the primary member (just away from the reduced section at the tenon) to resist the shear...thoughts/input would be appreciated. I have one tenon...
I'm hoping someone can help with a suggested resource for a small diameter (12"-36" diameter) vertical shaft design. Maximum depth of the shaft is about 30'. Shafts are for utility and air supply for and undergound tunnel in rock and are to be installed by drilling a hole, dropping in the liner...
Does anyone have a good reference for equations for calculating induced moments in a circular slab (simply supported) with uniform pressure?
Thanks in advance.
Has anyone used chainlink fence as reinforcement for shotcrete slope paving? I have a client who wants to use the chainlink as an alternative to WWF for slope paving for permanent erosion control. The ground surface is fairly irregular making the chainlink much easier to install. The chainlink...
I'm hoping someone has a good source for maps that can be legally used for vicinity maps on plan cover sheets. I've noticed some companies copy and paste in on-line maps but I'm under the impression that's not ok for commercial use.
Thanks.
This is a two part question:
1. My impression is that standard practice in the structural industry is to specify a primer coat to all structural steel, regardless of exposure. As I understand it, the typical primer is relatively porus and does not provide a good barrier against moisture. Section...
Our firm is in the process of designing a cut-and-cover reinforced concrete tunnel. I am curious if someone has recommendations or a good resource for design and detailing of reinforcement (two mat, 12" walls) at intersections (a groin vault detail).
Thank you in advance.
I've got a situation where a 69" diameter 7/16" wall pipe has been pushed inward, with up to 2" change in the horizontal diameter, due to external grout pressure. I am trying to determine at what point if at all the pipe wall is overstressed and needs replacement. The following was my attempt...
We periodically provide manufacturers of shoring equipment with stamped and signed tabulated data sheets. It's our understanding that anything you stamp and sign has to have the expiration, which means the manufacturers have to come back to us for re-certification every couple years (a headache...
I'm trying to design a steel shaft liner for a new pump station and I'm having difficulty finding design reference material on-line.
Here's the situation:
A 6' diameter hole is drilled through rock to the underground reservoir. The 54"x.375" steel liner is dropped in and the space between rock...
I'm trying to determine the maximum allowable external pressure on a 54"x0.375" and a 54x0.5" welded steel pipe (grade A36). Specifically, the pipe is capped at the bottom standing in water, so I'm trying to determine maximum allowable depths for the external hydraulic head. Ordinarily I'd order...
