Pin connection for RC beam
Pin connection for RC beam
(OP)
Hello all,
What is the detailing of a beam modelled as pin into a column, though there are beams at its start and end (longitudinally)? Also, is this allowed to pin connect the short beams in SMF to avoid shear failure of that beam? Or are there anymore ways to avoid this failure?
Reference:
What is the detailing of a beam modelled as pin into a column, though there are beams at its start and end (longitudinally)? Also, is this allowed to pin connect the short beams in SMF to avoid shear failure of that beam? Or are there anymore ways to avoid this failure?
Reference:

RE: Pin connection for RC beam
RE: Pin connection for RC beam
RE: Pin connection for RC beam
RE: Pin connection for RC beam
RE: Pin connection for RC beam
Moment redistribution cannot be used to provide a pin and would not reduce the possibility of a shear failure that much.
RE: Pin connection for RC beam
To rapt:I am not clear about "why there is a need to avoid a shear failure in that beam?", shouldnt i try to make it ok if it theoretically fails when quake occurs. "What is causing the shear failure?", it has high negative reinforcement at supports, as per code there will be high probable moment, due to short span the shear ((Mpr(left)+Mpr(right))/clear span of beam) coming from these Probable moments assuming the beam hinges at support, causes the beam to fail.
RE: Pin connection for RC beam
Do you need the short beam to function as part of your lateral system or do you just need it to ride along without losing its gravity load carrying capacity?
I think that limiting shear demand by limiting moment capacity is a valid approach if you consider over strength and the proportions of the beam are such that you can plausibly develop two plastic hinges within the beam length. It's not that different from how we design shear in normal SMF beams after all.
You might also.detail the beam as you would a coupling beam connecting shear walls. Diagonal reinforcing that crosses at midspan and effectively puts your pin there.
RE: Pin connection for RC beam
I am not much aware about detailing a coupling beam connecting a shear wall, please enlighten by sharing some information.
RE: Pin connection for RC beam
RE: Pin connection for RC beam
As usual we do not know enough. Is it an existing building or design for a new building.
if design for a new building, surely there is no problem designing for the shear. The beam on the other side of the column connecting to it is designed for the shear also.
Allowing a pin goes against all design rules unless you fully detail it as a pin. 100% redistribution is not allowed. I certainly would not like it designed so that it has to basically fail to form the pin. I doubt that it would survive as a vertical load carrying member in an earthquake in that situation. And bottom reinforcement has to be detailed for an end span condition.
And if you detail it as a pin (ie no moment capacity), you have to make sure it is tied to the column/beam it is connecting to. Is that feasible and still have it working as a pin.
RE: Pin connection for RC beam
I couldn't catch the meaning of "it is tied to the column/beam it is connecting to.' Do you mean running some bottom and top reinforcement beyond the joint?
RE: Pin connection for RC beam
RE: Pin connection for RC beam