I have a partial set of drawings for a concrete structure dated 1904. Within the main structure is a cast-in-place concrete pipe (84" inner diameter), the pipe thickness is relatively consistent at top, however the bottom half has a varying thickness such that the outside face is essentially...
New OSHA handrail/guardrail requirements have come into effect on Jan 17 of this year. Quoting from the new text (note all is from the same section/page):
"The height of stair rail systems installed on or after January 17 2017 (must be) not less than 42" from the leading edger of the stair...
Please see the attached sketch. I am working on a pro-bono project for a local camp grounds for the disabled. They are wanting to replace an existing firewood shed that is in disrepair with a new one. The column spacing is 6'-0" x 7'-9", with the largest column length of ~8'. It is to be...
Should all overhead installations of post-installed anchors be considered cracked concrete?
My understanding has always been yes, but I cannot locate the source of this. Per ACI 318-08 appendix D (D5.2.6, D5.3.6, and D5.2.7), concrete can be considered uncracked where indicated by analysis...
I am working on a project that is including a deep foundation of drilled caissons. The geotechnical engineer has included a recommendation for cross hole sonic logging tubes to allow for possible non-destructive testing. The only additional information within the report specifies for (4)...
We are having a debate if per code (IBC 2009, with the older codes similar), drilled cast-in-place concrete caisson are required to be load tested. The design compressive load on the drilled caissons will be on the order of 600TON, thus a load test would have to be for at least two times this...
I am working on a small portion of a large industrial rebuild project. My portion has been designed for approximately 3 months, and now the PM is stating a construction schedule that I feel is not possible.
My portion of the project was to design a replacement concrete pit for a rail unload...
We have designed a roof truss and it was galvanized. During the galvanizing,the top of the post member cracked. The truss is made up of a bottom chord beam of W12x26, the sloped top chords are W10x22, and a center post of W6x15. The crack has occured at the top of the post where the two top...
My company has been trying to get clarification on the Seismic Coeffs for Non-Building Structures Similar to Buildings with no such luck. The question concerns the detailing requirements when R<3 for Ordinary Steel Concenttrically Braced Frames with Permitted Height Increase. This has an R...
