Building Period relation to Stiffness

[wilberz]

The taller a building, the more flexible it is and longer period.
The shorter a building, the less flexible or more stiff it is and shorter period.

The more mass a building has the longer period.
The less mass a building has the shorter period.

Shorter period can attract more seismic load. Longer period can attract less seismic load.

So if you have a one or two storey building with shorter period. It can attract more seismic load. To make it longer period. You can
more mass to the 2 storey.. and "attracting" lesser seismic load.. but something is wrong here.. do you really have to add more mass to attract less seismic load?

 

[zackIX]

I really don't think that any adding of mass in a 2 story building will make great difference on the total base shear.

Besides, there will be more load on the second floor and less load on the first floor, assuming that the base shear is constants or the change is small.

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[wannabeSE]

By adding mass, the base shear coefficient, Cs, might go down. But the base shear,V, will still go up.