Vertical Distribution of Seismic Forces
Vertical Distribution of Seismic Forces
(OP)
By hand I am designing a 2-story light framed (wood) building that rests on a rigid concrete suspended slab, a 1 story parking structure below. I am inclined to design the wood building all by itself with the simplified base shear method and then design the concrete diaphragm with its own base shear added with the shear from the above wood building. In essence the design would be like a buiding on top of another building. The alternative is to design the building as a whole. If I design the building as a whole using the vertical distribution of seismic forces in asce7-02 the wood building recieves forces at the roof level of 243kips where its actual force should be around 16k. I can't see how this could possibly be reasonable. Anyone have any thoughts on my inclination? Thank you






RE: Vertical Distribution of Seismic Forces
Regards,
AUCE98
RE: Vertical Distribution of Seismic Forces
RE: Vertical Distribution of Seismic Forces
The spelling police.
Buy a dictionary, keep it nearby and USE it. Webster's New World Dictionary of American English is recommended, and Webster's Collegiate Dictionary.
RE: Vertical Distribution of Seismic Forces
RE: Vertical Distribution of Seismic Forces
RE: Vertical Distribution of Seismic Forces
In the IBC 2000, Section 1617.6.3.1, Exception 3 gives the two stage method that you can use.
In the UBC 1997, a similar two-stage analysis can be found in section 1630.4.2. (See also 1629.8.3, No. 4)
RE: Vertical Distribution of Seismic Forces