Hello,
I am designing a steel stair tower to act as a fire escape for a existing building. I am in seismic category D and I planned to use steel moment frames in one directions and braced frames in the other direction for my seismic system. My questions is am I required to use special moment frames or can I make intermate work? When the code talks about if it is one story with the dead load less then 20 psf for the roof its hard to apply that to a stair tower that doesn't have any complete floors or roof. It just has the platforms and stairs. Which is going to made of bar grating. I checked the non building structures seismic code and it appears to be the same rules as for the building? Does anybody have any ideas on where I should be looking at in the code?
I am designing a steel stair tower to act as a fire escape for a existing building. I am in seismic category D and I planned to use steel moment frames in one directions and braced frames in the other direction for my seismic system. My questions is am I required to use special moment frames or can I make intermate work? When the code talks about if it is one story with the dead load less then 20 psf for the roof its hard to apply that to a stair tower that doesn't have any complete floors or roof. It just has the platforms and stairs. Which is going to made of bar grating. I checked the non building structures seismic code and it appears to be the same rules as for the building? Does anybody have any ideas on where I should be looking at in the code?
