Hi All,
I am working on a school project that has some athletic fields around the perimeter of the building site, but for the most part is surrounded by housing developments and wooded areas. You can get an idea of the distances/scale from the football field and track shown on the attached...
Hello,
I am currently investigating the removal of a bridging joist located at the mid span of the joist. The span is roughly 15 ft. and the joists 5" X 10" spaced 25" on center. Looking at current ACI design for one way joist systems I have not encountered any bridging requirement, and the...
Hello,
I am designing a single story braced frame building (110' long by 35' wide and 16' tall). Seismic design category B, Risk category III, 120 mph wind speed per ASCE 7-16. Wind loads govern base on the calculated loads.
Before my involvement with the project it was decided to remove the...
Hi All,
I have analyzed and existing concrete pan joist roof structure (1958)for snow drift loads that the minimum compressive strength of the concrete specified on the drawings is 3,000 psi. The joists are adequate in flexure, but are about 15% overstressed in shear. I have already taken...
Hello,
There are some conflicting opinions/approaches to designing elevator hoist beams with my co-workers. I have read some that implement a factor of safety by doubling the required beam rating, and following either LRFD or ASD design which results in a FOS of 3+. I have read that some...
Hi All,
I have a scenario where a contractor is proposing to utilize tie-off anchors that attached directly to the metal roof deck using several self tapping screws (approx. 25 locations). Per OSHA, the tie off design load is 5,000 lbs. and shall have a factor of safety of 2. My concerns are...
Please forgive me, I do not have a lot of experience with AASHTO...
I have a project that involves an exterior elevated driveway over the first story of a building (HS-20 loading). The driveway consists of a radiant heated concrete deck (7-9" depth) on top of high density rigid insulation (4"...
I am currently working on a project where we are removing a portion of a curtain wall system from the first floor up to the third floor, and re-supporting on the third floor (bldg is 4 stories total - Concrete floor plate construction). The curtain wall gravity loads are currently carried by...
I am trying to determine if utilizing the 70% or 0.7 x 0.6W = 0.42 applies when I am designing a category IV building with an ultimate design wind speed of 125 mph. That corresponds to an MRI of 3,000. So in order to determine the wind service loads from the 10 year MRI or 25 year MRI from the...
I am trying to determine if utilizing the 70% or 0.7 x 0.6W = 0.42 applies when I am designing a category IV building with an ultimate design wind speed of 125 mph. That corresponds to an MRI of 3,000. So in order to determine the wind service loads from the 10 year MRI or 25 year MRI from the...
