building with expansion joints
building with expansion joints
(OP)
If we have a 800' long box warehouse with 2 expansion joints(8" wide)along the width, then do we treat it as a cont. beam with internal hinge at exp. joint points( to represent expansion joint) and supoorted on 4 supports (representing lateral bracing system)?
Thanks
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RE: building with expansion joints
RE: building with expansion joints
If there is no shear transfer across these joints, then I would suggest that you treat them all as completely separate units. If you want shear transfer across the joints, then your approach sounds like that is the way it should be modeled.
RE: building with expansion joints
So when transfering the wind force normal to 800' wall, will this wind be treated basically as acting on 3 separate buildings and the the interior VXB at the expansion joints will get double the load as compared to end VXB( assuming flexible diaphragm and equal stiffness for all VXB)?
If that is the case, then what will be the chord members at the expansion grid, assuming one column at expansion grid and sliding connection at one side of column?
Will the single roof beam(part of VXB) at the expansion joint be the common chord for both side of expansion joint for shear transfer?
Thanks
RE: building with expansion joints
The shear will need to be transfered thru the slide bearing into the single column and then into the common collector/drag/chord and into the vertical brace.
RE: building with expansion joints
Obviously, another option is to use double columns and double bracing.
RE: building with expansion joints
"So when transfering the wind force normal to 800' wall, will this wind be treated basically as acting on 3 separate buildings and the the interior VXB at the expansion joints will get double the load as compared to end VXB( assuming flexible diaphragm and equal stiffness for all VXB)?" Yes, I agree
"If that is the case, then what will be the chord members at the expansion grid, assuming one column at expansion grid and sliding connection at one side of column?"
I always refere to chords as the tension and compression members in the diaphragm equivalent to the top and bottom flanges of a beam, to avoid confusion. If you have 2 separate diaphragm angles with a common support beam at the expansion joint, then your chord for each building segment will respectively be each angle. The drag strut will be the common beam, which will be receiving forces from each building segment as you said.