Removing Temporary Steel Column
Removing Temporary Steel Column
(OP)
Hi
I have a temporary steel column (310UC158) that will need to be removed in the future. The column we be approximately 2,000kN (450kips) in compression and I am expecting the structure above to deform approximatley 2.0mm (1") when the column is removed. How would the column safely be removed? I was hoping to heat the steel so that it would soften and deform whilst still loaded and can be sefely removed. Has any done anything similar to this or have any recommendations?
I have a temporary steel column (310UC158) that will need to be removed in the future. The column we be approximately 2,000kN (450kips) in compression and I am expecting the structure above to deform approximatley 2.0mm (1") when the column is removed. How would the column safely be removed? I was hoping to heat the steel so that it would soften and deform whilst still loaded and can be sefely removed. Has any done anything similar to this or have any recommendations?






RE: Removing Temporary Steel Column
RE: Removing Temporary Steel Column
PE, SE
Eastern United States
"If a builder builds a house for someone, and does not construct it properly, and the house which he built falls in and kills its owner, then that builder shall be put to death!"
~Code of Hammurabi
RE: Removing Temporary Steel Column
-5^2 = -25
http://www.eng-tips.com/supportus.cfm
RE: Removing Temporary Steel Column
www.PeirceEngineering.com
RE: Removing Temporary Steel Column
RE: Removing Temporary Steel Column
you claim it will move 2 mm - then convert that to 1 inch (25 mm). Do you mean 1/10 of one inch?
Yes, you've probably just skipped a decimal, but 1 inch (25 mm) of "sag" is NOT trivial!
RE: Removing Temporary Steel Column
RE: Removing Temporary Steel Column
Mike McCann
MMC Engineering
http://mmcengineering.tripod.com
RE: Removing Temporary Steel Column
RE: Removing Temporary Steel Column
Thanks for the replies everyone.
RE: Removing Temporary Steel Column
RE: Removing Temporary Steel Column
RE: Removing Temporary Steel Column
RE: Removing Temporary Steel Column
RE: Removing Temporary Steel Column
www.PeirceEngineering.com
RE: Removing Temporary Steel Column
RE: Removing Temporary Steel Column
We made these with pipes of different size with a plates welded T&B to the smaller plunger. Enclosed compacted sand will take a high compression.
In some cases, these were preloaded with welded metal tabs to hold the pre-compression. These had to be knocked off before removing the sand.
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Removing Temporary Steel Column
www.PeirceEngineering.com
RE: Removing Temporary Steel Column
I agree that it's possible to remove columns and that it's done all the time, in the right circumstances, of course. Rightly or wrongly I was just fixating on the 450 kips with 1/10" deflection...something there seems off if the column is actually permanently removed.
By the way, as a point of interest, a former boss of mine was involved with the removal of a column in a historical structure of some sort. He had performed all the calculations demonstrating that it was viable and on the day of removal he had installed a strain gauge on the beam to monitor the results. When the column was removed the strain gauge read...nothing. So he started looking at the equipment trying to figure out what was wrong with the installation of the gauge and after about a minute or so the strain gauge slowly started to register the load. What he saw was the evidence of the plastic creep as the molecules rearranged themselves as they let each other know that there was a new load in town.
RE: Removing Temporary Steel Column
www.PeirceEngineering.com
RE: Removing Temporary Steel Column
Michael.
Timing has a lot to do with the outcome of a rain dance.