To BAretired (sponton and others). This is continuation from thread http://www.eng-tips.com/viewthread.cfm?qid=395252 because of word wrapping problem there.
BA you stated before when we were computing for pure axial load that "Note: The above calculation assumes uniform strain throughout...
Please see figure below of a column pinned on top and bottom. If there is a hole at the side at midspan, the column would deflect more than if there hole is at the base. Is this right? What is the principle called where hole at midspan would make it deflect more than if it occurs at bottom near...
(file photo 2 years ago but all parts topped with concrete now)
On top of my roofdeck is floor that is waterproofed then topped off with 1 to 2 inches of concrete to even the floor. This is because prior to putting the waterproof.. the floor is not even and rainwater is pooled on some part. So...
When RC Column bases in a special moment frame developed plastic hinges from seismic activity.. are they still repairable.. how are they repaired? or do you have to demolish and rebuild the building?
Can anyone show pictures of plastic hinges formed in an RC column?
BTW.. for steel columns...
Hi,
If you just want to use steel deck as raining shed instead of thin metal or plastic roofing. Is it possible to just use some kind of say insulated panel over the steel deck or even plastic roofing material over it.. or do you have to top it with concrete? But this would be so heavy.. what...
When you design structure or do renovations.. do you always check if the soil seismic properties can be in resonance with the structure? I heard tuff rock or stiff soil has resonance approaching that of 2 to 3 storey. And I read that some has to change the properties of the building so it won't...
Hi,
How rigid must be the horizontal trussing in a roof before it can be considered a full fledge diaphragm? When the structure was constructed. They use 0.5x0.5 meter column from foundation all the way to third floor (it was designed for 4 storey).. but we decided now to build up to 3 storey...
If your column is already casted in concrete, and you added a beam like in the above illustration (where holes are drilled in column to insert the longitudinal bars and I-beam at core of concrete beam welded to the metal plates at side (face) of column (with stirrups enclosing the I-beam at the...
http://www.kirinpanels.com/
Has anyone got any experiences with these panels that can be used as exterior walls and has said fire rating of 6 hours (compared to just 2 hours for concrete walls)?
This is the FAQ of it:
What is PIR?
Polyisocyanurate insulation is a closed-cell rigid foam board...
Are there *safe* ways to chisel the top of the column that is already topped with concrete to add a small beam? Or would the rebars (20mm grade 60) suffer fracture from the blows and not advisable in any way?
This is the column 2 years ago before the top were poured with 4000 psi ready mix...
Do you put column ties inside the footing? What is the failure mode if no such ties were put. The column can't dilate outward inside the footing itself because it's surrounded by concrete.. or can it? I don't see this mentioned in references..
Please refer to the above image. A shallow two sides (garble) will be put at the 9 RC column layout. My colleague initially make the suggestion of putting the beams the following way. He plans to put empty square bars (see picture) with size 250mm x150mm x 8mm thick) at the perimeter (see red...
There are existing huge RC columns above the roof (0.5 x 0.5 meter size). Instead of another floor. We will just put trusses to support a lightweight plastic or metal roof. There are 4 bolts of about 14mm at the corner of each column (see pictyure picture). If baseplate would be attached to it...
In the column interaction diagram.. zero axial load would correspond to the lowest moment capacity because there is almost zero axial load to counter the tension side of the column. What would be the effect of extending the column 3 meters above the roof to create axial load to create more...
