jacketing
jacketing
(OP)
I was searching for a handbook to design concrete and steel jacket for columns and beams. Any idea?
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RE: jacketing
A text on general composite design may be useful. I have an excellent one by Viest called Composite Construction Design for Buildings.
What's your particular application? Moment capacity? Shear capacity? Seismic confinement?
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: jacketing
The primary reason for jacketing is to confine the concrete during a high stress crushing failure occurrence, isn’t it? If so, the steel jacket will work well on a round column, where the expanding conc. volume puts the steel jacket in hoop tension, and the conc. is confined. This method will not work very well, for that purpose, on square or rectangular members, because the conc. volume change will cause plate bending in the steel jacket, not hoop tension, thus much more conc. movement can occur. I would expect the steel jacket to add some shear cap’y. to the conc. member if it is well attached to the conc. I’d see what I could find on this subject at ACI and CRSI, and might expect to find a few tech. papers on the subject. I’m not so sure I’d expect to find a handbook on the subject, and probably not much in most conc. design textbooks either. This is a fairly specialized subject and reinforcing means.
RE: jacketing
I have an old building and the owner needs to build a second floor. The column are small to handle a second floor so im tring to find the best solution for this case. So i was thinking of jacketing but i did't found any resource to start with.
RE: jacketing
Two things to keep in mind:
1) Fireproofing the finished product.
2) Some stresses will be locked in pre-reinforcing.
How close is your column to its squash load?
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: jacketing
The column is very old ,built with a "foreman " site experience ..so i prefer to consider it very close to squash load.
I will check the FRP text maybe i can find somthing helpfull.
Maybe i can model a column and transfer the forces to a wall surrounding it..
RE: jacketing
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: jacketing
Can't we just transfer the load to a wall( its will act as jacket) i think it will be more conservative..
Steel chanels is good idea but not cost efficent..am I right?
RE: jacketing
RE: jacketing
You might want to post some sketches. You often get better advice that way.
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: jacketing
Thank you kookt for your replies
RE: jacketing
Have you checked the foundation capacity? Are they able to take anticipated load of proposed second floor, without any problem? In case they are NOT, you would need to strengthen the foundations first.
Load carrying capacity of columns may be increased by several methods. For example, concrete or steel jacketing and FRP wraps. Following books might help you in this connection:
1. Concrete Structures - Protection, Repair and Rehabilitation by Dodge Woodson
2. Retrofitting Design of Building Structures by Xilin Lu
3. Strengthening and rehabilitation of civil infrastructure using FRP composites by Hollaway and Teng
4. Composites for Construction_Structural Des with FRP Materials by Lawrence Bank
RE: jacketing
I wouldn't look at the concrete jacketing as walls. I'd consider it to be a square column. Whether that column is solid or a doughnut will depend on what kind of connectivity you intend to establish between the new and existing concrete.
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: jacketing
KOOTK,
I was tring to find a way to model it on ROBOT. Sorry I don't have any framing plan with me now. But I got your idea. Thank you for your help.