Manually calculate beam “k” values for older sections?
Manually calculate beam “k” values for older sections?
(OP)
I’m designed new steel to fit within a steel building composed of shapes from ASD 7. The properties for these shapes are given in the historic shape data spreadsheet on AISC’s website. Unfortunately the spreadsheet does not include K or T values. It does have the d and tf values though. Is there a rule of them for the ratio of T/d or k/d? If not is there a general radius size between the web and flange that I can add to tf to get a value for k?






RE: Manually calculate beam “k” values for older sections?
RE: Manually calculate beam “k” values for older sections?
RE: Manually calculate beam “k” values for older sections?
The “k” value has been shown in the AISC Manuals all long. The earliest one which I have right at hand is a 1958 printing, and the latest edition which I have also has them tabulated.
RE: Manually calculate beam “k” values for older sections?
JStephen: It is existing but it's in another state and there are many difference sizes in use.
dhengr: I don't have any manuals older than the 13th edition, I've only used the AISC spreadsheets: http://www.aisc.org/content.aspx?id=2868
RE: Manually calculate beam “k” values for older sections?
Calculate the area of the member (based on d, tw, bf and tf) subtract that from the area given in the table. Any extra area is equally split among the k areas. Assume them to be simple triangles and you've got a reasonable approximation of the k areas.
RE: Manually calculate beam “k” values for older sections?
RE: Manually calculate beam “k” values for older sections?
RE: Manually calculate beam “k” values for older sections?
RE: Manually calculate beam “k” values for older sections?
Well, there you are..., you have developed your very own rule of thumb for something. It’s yours, use it at your own discretion and risk. In the mean time, most of us will probably continue to look in the AISC Manual for that info. since it has always been tabulated there with all the other section design dimensions, or detailing dimensions.
RE: Manually calculate beam “k” values for older sections?
dhengr: I agree, I would use the tabulated data if I had the ASD 7 manual
RE: Manually calculate beam “k” values for older sections?
See: Older Manuals