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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...

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...

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...

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...

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...

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...

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...