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Hello, My company is designing a courthouse that does not have any holding cells or other facilities that would require a risk category iv construction. In a recent meeting we were informed by the architects that the local county was wanting to add a backup 911 call center. I am thinking that...

Hello, I am working on a steel and wood framed building built back in 1915. The contractor, while performing demolition noticed a deflection a steel beam forming the edge of an auditorium balcony. Using a laser level, he determined that the beam has a deflection of about 2-1/4". The beam is an...

Thanks for the replies and information.

Hello, I am hoping someone can help direct me to design guide or reference material. I am designing a slab that will be supported by steel piles. The slab will be constructed between two underground structures, which is why we are using piles. The pile will be driven to bedrock. I have been...

It was a common building material back then. Below is a link to a free online only pdf of "Principles of Tile Engineering; Handbook of Design" by Plummer, Harry C. dated from 1947. It should give you the information that you need...

Thanks for the information. Phil

Hello, I have a question about snow drifts. I am designing a building that has three different roof heights meeting each other, please see the attached. For the area that I have circled should I combine the drifts off the other two roofs or should I take just the worst case to design the...

I believe BAretired you may be correct. Looking at the plans again, I see that between Panel G and F they have the added top bars in the column strips but show them in both locations, where as at the 2 that I circled they did not have the room to write both seperatly. Thanks for the responses...

Possible, but the tile used is a structural clay tile. The attached page shows how the clay tiles were used in this type of floor, but without the topping slab shown. For this building however instead of the structural floor tile shown they used a 20"x20"x8" steel form pan...

All, Thanks for the replies and sorry about the quality of the scan but I did not do it, it is a B&W scan of a photo copied drawing. To answer some of the questions, the building is a school building, built in 1935, is constructed using a steel frame with concrete slabs for the floors and roof...

Hello All, I am working on a building built back in 1935 and have come across a rebar call out I cannot figure out and I was hoping someone here may have seen it before. Does anyone know what OQ's is refering to in the circled callouts on the attached plan? I have not been able to find...

What I have been using lately comes out of the ASCE 7-10 commentary for live loads, where they have a table of additional live loads, table C4-1 on page 344. From that table I have started using Air Conditioning (machine space) load of 200psf for unknown mechanical platforms.

Thank you for your replies and ideas. This project is still in the very early stages / preliminary. We are not connecting the beam to the plate as shown in the detail I was just to lazy to take it out before posting it. ProgrammingPE - I was not not thinking about doubling the values, I was...

Thanks for the responses so far. It looks like I may need to add a bit more information. The beams are being added to reinforce and existing pre-stressed concrete waffle slab system that is showing signs of failing. The only weight we are adding to the system is the weight of the steel beams...

Hello all, I am hoping some of you may shed some light on the concrete breakout strength equations of ACI 318-14. The background is we are trying to connect a new steel beam to either an existing 24" wide x 11" deep concrete column with a min of (4) #11 vertical bars and #4 ties spaced at 11"...

I have come across these a couple of times. They use the tile more or less as an in place form. Below are a couple of links to books on those floor systems that i have looked through. The first one is "Handbook of Hollow Building Tile Construction"...

AISC also offers an Excel spread sheet, for free for everyone, with historic shape information.

You can find the catalog for the Truscon Joist at https://archive.org/details/TrusconOpenTrussSteelJoistsForFloorConstructionNdAsPurlinsForRoof They do seem to match your photo.

I tend to just multiply fc by psi. So it looks like 57000*(fc*psi)^0.5, does the same thing as the method mentioned by IRstuff.

OK, I guess I need to get some new glasses. Thanks for the help, Phil