Column supported by a cantilever beam.
Column supported by a cantilever beam.
(OP)
Greetings,
I was shown architectural drawings for a three story building in which the second and third floor exterior columns rest on the end of a cantilevered beam from the first floor, The cantilever beam is 6.5ft long. I did some preliminary calculations and it seems doable (Section size and rebar)for gravity loads, for lateral loads such a discontinuity would be quite problematic; but I believe this problem could be solved by using shear walls in the interior of the building to take all the lateral loads from the columns. I would like any input you could give me on a case like this, I'm not entirely convinced this is such a good idea (well, I think its a terrible idea..)
Thanks.
I was shown architectural drawings for a three story building in which the second and third floor exterior columns rest on the end of a cantilevered beam from the first floor, The cantilever beam is 6.5ft long. I did some preliminary calculations and it seems doable (Section size and rebar)for gravity loads, for lateral loads such a discontinuity would be quite problematic; but I believe this problem could be solved by using shear walls in the interior of the building to take all the lateral loads from the columns. I would like any input you could give me on a case like this, I'm not entirely convinced this is such a good idea (well, I think its a terrible idea..)
Thanks.






RE: Column supported by a cantilever beam.
1) Keep an eye on long term deflections at the cantilever tip and the impact that may have on cladding joints. A large portion of your load will be permanent.
2) Be sure that the the beam design accounts for vertical seismic accelerations.
3) Use top bars in your beam that can be sufficiently developed past the face of the column.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Column supported by a cantilever beam.
RE: Column supported by a cantilever beam.
RE: Column supported by a cantilever beam.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Column supported by a cantilever beam.
Honestly I thought I was going to get a big no-no for this type of building since it places a rather large concentrated load at the tip of the cantilever, but I couldn't find a good reason no to pursue it other than my reservations about it.
RE: Column supported by a cantilever beam.
BA
RE: Column supported by a cantilever beam.
RE: Column supported by a cantilever beam.
BA