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In this particular case, we chose to classify this as a small mercantile occupancy (they sell cars) in order to get away from any NFPA requirements related to a parking garage. But now our eyes are open to this NFPA 88A requirement and we have a lot of small commercial parking structures. A...

I have already given the relevant code references. And it seems to surprise folks that we enforce both the IBC and NFPA equally. I am the Authority Having Jurisdiction who enforces the 2012 IBC with a few local amendments. And I share this responsibility with one other who specializes in the...

We enforce NFPA 1 Chapter 29 which makes reference to "parking garages" which defaults to NFPA 101 Life Safety Code Section 42.8. Life Safety Code 42.8.1.4 Incidental parking to other occupancies... is not the basis for overall occupancy classification. So far, I have found no square foot...

It should seem reasonable that a stand-alone commercial garage with five or six parking bays will not have a sprinkler system. It should seem reasonable that it will not have a mechanical ventilation system. IBC 903.2.10 would exempt any enclosed parking garage from being sprinkled if the fire...

hawkaz, Terrific feedback. For my CMU blocks, I am using 150 pcf. Should I be using 100 pcf or 120 pcf instead?

Thank you Jayrod. As noted in the illustration... The span of the lintel is 12 feet with 8 inches of bearing on each end. The span of the roof truss is 50 feet. The height of the masonry wall above the lintel is 4 feet.

I am a commercial plan reviewer trying to maintain my mathematical skills which helps me do a better job while reviewing proposed structural projects submitted by engineers. The attached problem illustrates a new overhead door cut into an existing masonry wall. The criteria includes a deflection...

Somehow your rock in the swimming pool made everything "click" for me. This Civil Engineer calculated the force from the saturated soil BELOW the slab as being equal to the force of the water ABOVE the slab (as if the water was not displaced by the concrete slab) as a way to negate the vertical...

The calculations provided by the Civil Engineer indicated that the saturated soil below the slab will exert an upward force equal to the unit weight of water multiplied by the area of the concrete slab multiplied by by a soil depth BELOW the concrete slab. 62.4 lbs/ft^3 (unit weight of water) x...

In lieu of the Excel spreadsheet, I have attached a jpeg illustration.http://files.engineering.com/getfile.aspx?folder=f57553c4-4a72-456b-8881-c72b9f0dbbe6&file=Buoyancy.jpg

Hmmm, I think we are talking about general principals of buoyancy but I am not making my question clear enough. Let me refer to the excel spreadsheet (which also contains a graphic illustration) and ask if the calculations for uplift on the concrete slab are correct. There are NO building...

In other words, we can completely ignore any uplift from the underside of the slab if the bottom of the slab is at grade level? Is that true?

I am reviewing plans for a 900 sq.ft. shooting shelter to be located in the flood plain. The Civil Engineer has provided calculations to demonstrate that the concrete pad will not float away when submerged under flood water. Here is my question: What is it that determines the soil depth...

The IBC Table 2304.7(1) lists a minimum roof panel thickness of 5/8" for roof trusses spaced at 24" O.C. Simple enough. But then the next Table 2304.7(3) allows for a thickness of only 7/16" for STRUCTURAL panels with a span rating of 24/16. This would suggest that there are two types of...

What is the difference between OSB Sheathing and Structural OSB Sheathing? Just the stamp? Thanks

I am serving on a committee to discuss cross-discipline practice among engineers and architects. What allowance does your state provide for incidental design on projects that require at least one design professional? For example, Alabama and Alaska allow incidental practice among professionals...

I could assume that it has similar properties compared to an S7x15.3. Moment of inertia: 36 in^4 Section modulus: 10 in^3

http://www.fileden.com/files/2007/3/25/925948//Beam.pdf The drawing shows an old style beam that doesn't appear in my steel book. The beam supports the wood floor of a building built in 1920. What size is this beam? Is it an "M" shape or an "S" shape? Section modulus and moment of inertia...

I've been doing some side work as an architect for a meager $1 per square foot of new construction space. For twelve years I worked closely with a team of engineers but those were big projects for more sophisticated clients. For those juicy projects, a typical breakdown of fees (8% of the...