Reinforced Concrete Beam End Restraints
Reinforced Concrete Beam End Restraints
(OP)
I have a RC beam that is bearing on a wall at one end and integral with a column at the other. I could design the beam as partial fixed to the column and pinned at the wall. To make reinforcement placement simple, I was thinking instead to design the beam as pin-pin so it will mainly just have bottom bars. I don't have to worry about the integrity of the column to beam joint either.
I know the beam will work this way, however I am a little concerned with the cracking that will occur at the top of the beam at the column end as this end rotates to achieve a "pin" condition. Anyone else have experience with this situation? Should I add a few top bars at this end anyway to control the crack width?
I know the beam will work this way, however I am a little concerned with the cracking that will occur at the top of the beam at the column end as this end rotates to achieve a "pin" condition. Anyone else have experience with this situation? Should I add a few top bars at this end anyway to control the crack width?





RE: Reinforced Concrete Beam End Restraints
RE: Reinforced Concrete Beam End Restraints
RE: Reinforced Concrete Beam End Restraints
It is a T beam that I designing on the ramp of a parking deck. In the negative moment state, it doesn't have the wide compression flange like it does in the positive region.
The amount of negative reinforcing required to achieve a fixed end is larger than the maximum allowable amount of tension reinforcing (due to the decrease in section).
Taro:
It is ACI that I am using. This is a single span, (simple span if pin-pin), is 8.4 not addressing continuous members? Do you feel these provisions should apply to my case as well?
RE: Reinforced Concrete Beam End Restraints
I agree with the above that you cannot just ignore the top moment. The cracking that would result could significantly affect your shear capacity in the beam at the column.
RE: Reinforced Concrete Beam End Restraints
RE: Reinforced Concrete Beam End Restraints