To Structuresguy:
If you have the natural frequency at 6 Hz, why would you want to increase it to 20 Hz? You say the column is to support a telescope, right? I would think that the ideal frequency in that case would be zero, meaning the telescope was rigidly locked to the planet. If I am right...
To IRstuff:
Yes, seriously.
A lack of building codes is a wonderful thing, in a country where private property rights are secure, as they were in the U.S. a hundred years ago. Such a lack, however, is of no use in a country where property rights are pretty much nonexistent, as in present-day...
To Woodman88:
If you will deign to search this thread using the word "local" you will find that I noted early on that there are local variations in building codes. Such variations exist for a number of reasons, prominent among which is the desire of local regulatory authorities to appear to be...
To Woodman88:
You said:
"Cheap light-frame construction is the only home many people will ever be able to afford to live in. If we decide to force all homes and buildings to survive an hurricane like Andrew or last more than hundred years than where will most people live and work?"
My...
Guys, I just wanted to have my say before they lower me into the ground and shovel in the dirt. Just a few more comments below, and then I leave you all to mull this over, or not, as you wish.
To those who very politely hinted that overly large design values for compression perpendicular to...
To FRV:
This is in response to your more recent posts.
Concerning my "verbosity," the rule when trying to lead someone to a truth that lies off the beaten path is this:
"First you tell 'em what you're gonna tell 'em. Then you tell 'em. Then you tell 'em what you done told 'em."
Most of the...
To FV:
This in reference to issues raised in your first post.
In the case of materials (e.g., wood) for which the stress-strain curves have a straight-line portion, the proportional limit (the largest stress on the straight line) and the elastic limit (the stress beyond which the object will...
To LonnieP:
I'm not saying you should feel free to increase the design values that apply in your locality. Such values are inputs to the calculations by which you determine the load-bearing capacity a structural element is required to have in your situation. This requirement is a matter of law...
It looks to me like the baseline design values for wood compression perpendicular to the grain are way too high. For white oak dimension lumber, for example, the design value is 800 psi (American Wood Council: Design Values for Joists and Rafters, 2005 edition, pg. 18), whereas the elastic limit...
