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Looks like there is pretty much agreement that two units will work much better so that’s what I’ll go with. Thanks to everyone who responded. Hank

I’m a structural engineer so unfamiliar with most HVAC issues. I am building a two story house and planned to have different upstairs and downstairs HVAC units. However I am using foam insulation in the walls and rafters and have been told I only need one unit for both. Is this correct? Thanks...

Thanks to everyone for replying. It has been very helpful. Hank

I am a structural engineer trying to size an A/C for a house I am designing for myself. Is there a website or short publication that shows how to do simple calculations, maybe that include sizing the ductwork? I'm not too comfortable with the one ton/500 sq ft rule of thumb used in my area.

Found the article and got information on the magazine. Thanks

epr I am not concerned about my previous projects as they have withstood the test of time so to speak. However my company has several “standard” foundations that support “standard” structures which now do not meet the ACI code. I now have to inform my managers that the foundation is no longer...

epr I could not find your reference in the archives of Structure Magazine for that month. Could it have been a different month? Thanks for the reminder about this magazine. I had forgotten that it existed as I am in a specialized area of structural engineering. Interestingly I could not find...

Thanks to both of you for replying to this thread. Your input has been helpful

For years I have used a procedure in CONCRETE INTERNATIONAL dated July 1981 titled “Guide to the Design of Anchor Bolts and Other Steel Embedments” which outlines how to calculate the concrete pullout strength of embedded bolts in concrete. The procedure basically uses the tension strength of...

I am concluding that since our structures are predominately loaded with wind, the ASCE 7 load factor of 1.6 for wind and 1.2 for dead load will effectively insure that our antenna’s will meet the British design code. However we will provide this basic information to our customers so that a...

I got the BS 6399-2 document you informed me about. The 1.4 factor you mentioned was something I decided to check into. We happened to have a 1990 version of BS 5950 Part 1, and when checking into getting the latest version, I discovered that it was quite expensive. In the version we have, table...

Interesting as ASCE 7 has a safety factor of 1.6 for wind. Okay, I checked out the spreadsheet you referenced and I might be able to use it. I'll also check the snow loading and appreciate the reminder. Thanks for all the valuable information. Regards Hank

The 3 second gust and 50 year storm are the same as ASCE 7. It sounds like the basic calculation is similar. Does the British code allow for any kind of stress increase due to wind and dead weight only forces, or a decrease in the load factor? Is the classification of a dynamic structure based...

My company designs parabolic antennas. We have reliable wind tunnel test that provide drag coefficients for the wind at different angles to the antenna. I can use the basic wind pressure calculated from ASCE 7, along with these drag coefficients to determine the loads on the antenna. My question...

Anyone have any information on where I can get some information on the British wind loading specifications or where I can download the specification?

Euler buckling is based on l/r squared and area squared. Hence the results is based on the ratio of the diameters to the forth power. Therefore a small difference in diameter can mean a large difference in the allowable load. Nominal diameters can be around 25% larger than the root which means a...

Yes it is great. We use limit switches a lot also. Considering the response I got here, I'm glad that design was never used. But I did want some verification that I was not being overly conservative. Thanks again for the help.

Thank you Lutfi We use a lot of Joyce jacks and they also use the root diameter to calculate compressive loads. Thanks for the link. It was interesting.

Thanks fox for the reply. The AISC manual, which is the steel Bible for structural engineers, gives an area for both the root diameter and a tensile stress area of bolts. I feel sure that is the same area you are referring to. I believe it is basically the area you would get if you cut a...

I use machine screw jacks in my business to support and control mechanical equipment. Often the screw must be extended quite a distance in order to obtain the required range of travel. I have always used the root diameter to calculate the area and r for the kl/r value to use in the compression...