IBC Flashcards
The IBC requires that a certain amount of accidental torsion be considered even when a building is symetrical. WHy?
- to allow for nonuniform vertical loading
- to allow for asymmetrical floor openings
- to allow for eccentricity in rigidity due to non structural elements ans aeismic ground motion
- to allow for the fact that positions of loads in an occupied building cannot be exactly determined
The overall thickness of a one-way reinforced conrete slab is often determined based on ACI 318 provisions for minimum thickness. According to these provisions, what should be the overall thickness for a cantilevered concrete slab if the slab is 11 ft.
13 in
according to ACI 318 provisions for minimum slab thickness, the minimum overall thickness of a cantilevered slab of span L is L/10
THe IBC requires that all buildings in seismic design categories D, E, and F be provided with accelographs if
- more than 6 stories tall and having an aggregate floor area of at least 60, 000 SF
- more than 10 stories tall
A soft story is a story in which…
… the lateral stiffness is less than 70% of that in the story above or less than 80% of the average stifness of the stories above
A weak story is a story in which
the lateral strength is less than 80% of that of the story above
An extremely soft story is a story in which
the lateral stiffness is less than 60% of that in the story above or less than 70% of the average stories above
The IBC classifies the moment resisting frames into 3 categories
special moment resisting frames, intermediate moment resisting frames, and ordinary moment resisting frames
Intermediate moment resisting frames cannot generally be used in which seismic design categories
D, E, and F
In the lateral load resisting systems known in the IBC as a dual system, the moment resisting frame must be capable of reisting at least ___% of the base shear
25
A dual system is basically a structural system with two components
According to the IBC, a plan structural irregularity can be due to openings in the diaphragm system when the total open area exceeds ___% of the gross enclosed diaphragm area
50
THis is known as diaphragm irregularity
According to the IBC, in which seismic design categories can the equivalent lateral force method always be used
A, B, C, only
