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  1. iyota

    SEISMIC MASS OUTSIDE THE DIAPHRAGM

    Seems that RISA requires a diaphragm to generate autoseismic forces. And the dynamic analysis will only work with a rigid diaphragm. We're doing a project that has an external steel sculpture tied-back to the building diaphragm. Because the sculpture is outside the diaphragm, it seems RISA...
  2. iyota

    CRACKWIDTH FOR BASEMENT WITH PVC LINING?

    I work in a pretty good company. And we're designing an RC basement under the water table. It is lined with a loose-laid PVC membrane. For crackwidth, everyone says we need to limit the basement wall/raft crackwidths to 0.2mm. But I keep questioning why 0.2mm when there is a flexible membrane...
  3. iyota

    Expansion joint in basement?

    Thanks for replying rowingengineer, Basement construction will be bottom-up, with a diaphragm wall tied to temporary ground anchors. And yes, there will a delayed-pour strip all around the perimeter wall for the slab to shrink at curing. Correct, the waterproofing has been my biggest concern...
  4. iyota

    Expansion joint in basement?

    Hello friends, We're designing a building about 100ft x 330ft long, with 4 basement floors. An expansion joint is provided from ground level to the roof. However, I feel that we should NOT put an expansion joint in the basement box. This is because it is about 30ft underwater and in...
  5. iyota

    PT two way slab

    Rapt, No, this guy has a design firm. Whether or not his firm also supplies the strands and does the tensioning, I don't know. Retired now and apparently does PT design himself in projects whenever he feels like it. But anyway, thanks for thanks for the info. Nice to hear things I never...
  6. iyota

    PT two way slab

    Rapt, I'm pretty sure he used column-middle strip arrangement. It was a building in London we recently finished and the column spacing was 7.5x7.5m square bays. That's why I'm sure if I saw a banded-distributed arrangement, I would have commented on it. Also, his firm advocates unbonded...
  7. iyota

    PT two way slab

    RAPT, So doing a column-middle strip configuration is too hard for unbonded tendons? -I was never aware of that. Is it more of a construction issue rather than design? I guess i'm asking because last year we had a PT slab contracted out to a PT company. And it was designed by one of the...

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