new concrete column on existing wall
new concrete column on existing wall
(OP)
Hi, I have never done something like this so i have a question...
I want to add new concrete colums 30 x 30 cm on existing concrete wall (width = 30 cm).
Im wondering whats important and how it can be done?
Drilling holes first (whats max depth that can be done in existing concrete walls), cleaning holes, adding special glue, putting in dowels/rebars for columns,....
Also is it OK to model this column supported that way:
displacement in all directions + rotations in all directions are restrained (not possible)?
see attached file. tnx for answers.
I want to add new concrete colums 30 x 30 cm on existing concrete wall (width = 30 cm).
Im wondering whats important and how it can be done?
Drilling holes first (whats max depth that can be done in existing concrete walls), cleaning holes, adding special glue, putting in dowels/rebars for columns,....
Also is it OK to model this column supported that way:
displacement in all directions + rotations in all directions are restrained (not possible)?
see attached file. tnx for answers.






RE: new concrete column on existing wall
Normally:
- Bearing stress at the interface is important.
- Consider the joint pinned if possible and restrict dowels to a couple of centrally located drill and epoxy vertical bars.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: new concrete column on existing wall
About bearing stress - you mean something like this:
Rd = 300 kN (compressive force in column)
A = 30 cm x 30 cm = 900 cm2 (contact area)
stress = 300 kN/ 900 cm2 = 0,33 kN/cm2 < fcd (1,67 kN/cm2 for concrete C25/30).
So there is not a chance to consider fixed supports instead of pinned. Because pinned supports cant bear moments...
tnx for answer.
RE: new concrete column on existing wall
RE: new concrete column on existing wall
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: new concrete column on existing wall
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: new concrete column on existing wall
have a good day.
RE: new concrete column on existing wall