behavior of steel frame with infill CMU
behavior of steel frame with infill CMU
(OP)
When a steel frame has infill CMU built tight and anchored to the columns but isolated from the beam above for deflection, the block resists lateral loads by the diagonal compression strut action. Correct? or it needs to be also connected to the beam?
Your input is appreciated. Thanks






RE: behavior of steel frame with infill CMU
RE: behavior of steel frame with infill CMU
RE: behavior of steel frame with infill CMU
The way I see it is that yes, there must be a continuous attachment both at the top and bottom of the wall to attain the CMU compression strut masonry action, and the tables and formulas by TMS, ACI and ASCE 530 document reflect those assumptions. If there were no continuous attachment, then the wall shear capacity for in plane forces would not apply and I think the loading would resemble more of a column (pier) with uniformly loaded at its jambs (column flanges), in other words, the wall would deform as a column does.
I have been looking for an example where the compatibility betwwen the steel frame drift and the cmu wall in plate deformation is addressed.
Best regards
Rarebug
RE: behavior of steel frame with infill CMU
RE: behavior of steel frame with infill CMU
My understanding is this:
compression strut will develop only if the lateral force applied on CMU is smaller than:
1-shear capacity of block/joint
2- bearing capacity of an effective width of block.
The lateral force could be calculated by assuming supports at the locations of the Z-ties. The reactions at the supports are the lateral forces. Now for deflection calculation, a compression diagonal brace with equivalent axial stiffness is assumed considering cracked section.
RE: behavior of steel frame with infill CMU
Use the google search at the top of the page to find the previous thread.
RE: behavior of steel frame with infill CMU
The link to the references you provided is not working. Can you please check if it is correct? Many thanks
RE: behavior of steel frame with infill CMU
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