huangyhg

w shape on masonry wall detail
hi everyone,
i am looking for a detail where the w-shape beam seats on masonry wall. how it is connected to wall and how to build a parapet around it?
also this beam has 1.57 degree slope how this can be detailed on top of wall? i appreciate if anyone has a detail
most books have detail for joist on top of cmu wall not regular i beam on top of wall.
i appreciate any help.
regards,
bfstr
depending on the end reaction of the beam you can sit the beam on a bearing plate either directly on the wall or a pilaster. height of wall, beam reaction, wall thickness and height of parapet will govern which way you decide to go.
also it is common to use prefabricated solid insets to pass loads to walls. to acommodate rotation some gap with foam or nothing is sometimes used, since masonry is quite sensitive to deformation.
we would typically build the cmu wall first full height and corefilled. then fix a seated angle to the masonry wall with chemical anchors to support the steel beam.
here is a detail which works well.
ba
thank you baretired (structural) for the attached detail.
may i have your opinion about the detail that one of the designers came up with at proposed to me?
what problems might this detail create? is the coping reduce strength of beam or other possible effects that might have?
i appreciate direction and opinion from senior people.
regards,
bfstr.
baretired (structural), i forgot to ask you why did you use vertical stiffener at the end of beam, is it due to web crippling possibility? or due to having a sloped beam?
thanks.
bfstr
the detail your colleague suggested should be fine. the cope does not weaken the beam in any material way at that location. i think i would prefer the center of bearing to be more central in the wall.
the gusset plate on my detail was to resist web crippling, something i prefer to use without bothering to do the calculation. in reality, it may not be needed.
ba
we typically grout and reinforce the two cells under the beams, provide a bearing plate with anchor bolts to the beam bottom flange. keep an eye out on the beam's reactions. if it gets too high, the cmu may work by the numbers, but you'll get some cracking and then a phonecall from the owner.

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