I have a condition where the bottom floor of a 2 story building will be open. The end columns I have designed as moment frames. The columns are round HSS14x.625 columns. For protection, the arch would like to wrap the columns in concrete. I was thinking of having studs welded to the column so...
I have a client that wants me to design a steel column and bracket for a wind load of 150 mph. He wants to install this bracket all over the Country. Two questions 1. I am only licensed in a few States so he would only be able to use the design in the States I can seal for him. He says there is...
Asce 7-05 and IBC both call out for a live load of 100 psf at lobbies and first floor corridors. Is the lobby being referred to here for all floors? I generally design all upper floors of office buildings for a live load of 80 psf. You could have a large lobby area around an elevator shaft...
For fun, I've been trying to learn the Column Analogy Method. Well its not been as fun as i had imagined and i have a few questions i can't figure out. the first has to do with calculating the moment of inertia. I am following an example and have circled (2) places on each of the pages of the...
I need to increase the moment capacity of a few reinforced concrete joists by adding carbon fiber reinforcement to the bottom side only. The joists, originally built in 1958 appear to be designed with fixed ends. When I analyze them with the new loads and fixed ends, the moment is too high in...
An architect is wanting me to design a drive thru that has only 2 posts, similar to the structures they install over gas pumps. Has anyone ever designed one of these? Are the columns designed as a cantilevered column to resist lateral loads? It seem this is a very unstable structure. I've...
For an 8" slab on grade reinforced with #3 at 12" o.c. each way, is it better for the reinforcement to continue through control joints or be broken 2" each side of joint. Is a smooth, greased dowel required to allow horizontal movement but no vertical movement.
If no control joints are...
I have ordered the 75 year manual for steel joists but not gotten it yet and need to have the calculations completed tomorrow for an existing joist with a new load. Could someone please look up the allowable load and weight for a 22H7 joist. My span is 35'-1".
thanks in advance.
I have a pre-engineered building foundation I am designing. There will be a turndown around the perimeter. This building has an 8" cmu full height wall in some places. In the past i have specified an individual spread footing below the turndown to support the CMU. The contractor has requested...
I am working on a project that has steel I-beams that are encased with concrete carrying a concrete floor. From the underside of the floor there are 1'-0"x1'-0" terracotta tiles within the concrete slab. It looks like these were placed in the concrete form and the slab poured around them. In...
I need a computer program to help me speed up my design work. I used Ram Frame 3 or 4 years ago when I worked for someone else but have just been doing all my designs by hand with the help of enercalc for beam anylsis and so forth ever since I went out on my own. Most of my work is one story...
I'VE GOT A 20'-0" HIGH WALL ON A PROJECT THAT HAS AN 8'-0" WIDE OPENING. BASED ON 20 PSF WIND LOAD THE KING STUDS WOULD HAVE A DISTRIBUTED LOAD OF 80 LB/FT AND NEED TO BE (4) 2X8'S. THE CONTRACTORS SAY THIS IS EXCESSIVE AND IT DOES SEEM TO BE, BUT I CAN'T WORK THE NUMBERS OUT ANY OTHER WAY. IS...
I am designing a small pier and gazeebo that will extend out into the Albemarle River down near the coast of NC. I don't have any experience of coastal design. I need to get FEMA 55 as a starting point. What other reference materials do I need to educate myself on Coastal design.
Any thoughts...
does anyone have any values for 2 ply 5/8" gypsum sheathing on each side of a metal stud. The IBC has values for 2 ply gyp sheathing for wood studs, but not for metal studs.
I was called out to a house that was built in 1992 to address some floor issues. In the crawl space the masonry fnd. wall is 2'-0" high. Above that is a 2'-0" high stud wall that goes up to the first floor joists. The stud wall is out of plane approximately 3/16". You can see how the sill plate...
I was reading an archived post. (thread507-124847) In it there was a formula from AASHTO that gives an effective width of slab to use for concentrated loads. The formula is as follows: Width to use = 4 + 0.06S where S is the span of the slab. My question is the S in feet and the cooresponding...
I've been asked to analyze an existing elevated slab to be used as storage. The slab itself is 6" thick (d=5.75) 3000 psi with #4 @ 6" o.c.spanning 12'-10" from concrete beam to concrete beam. Temp steel in other direction is #3 at 10" o.c. The original design drawings from 1968 say the floor is...
I have a one story house that has approximately 2'-0" of unbalanced backfill against the foundation wall. From top of footing to joist bearing is 2'-8". The wall itself is 12" cmu. is there anywhere in the IBC residential code or ACI that requires this wall to have dowels into the footing. They...
I HAVE A JOB WHERE WE ARE CUTTING OUT A 9'-0" HIGH X 16'-0" WIDE OPENING IN A PRECAST DOUBLE T-SHAPED WALL. I WILL BE USING STRUCTURAL STEEL TO SUPPORT THE WALL ABOVE THE OPENING THAT REMAINS. I PLAN TO RUN A COLUMN ON EITHER SIDE OF THE OPENING AND BOLT INTO THE DOUBLE TEE ROOF MEMBER (INTO THE...
