## Calculate Building Stiffness

## Calculate Building Stiffness

(OP)

i have a real building model (two story) and i do a free vibration test for the building (floors acceleration had been measured)then i get the frequency for the first and second mode. what shall i do to calculate stiffness of the building?

## RE: Calculate Building Stiffness

## RE: Calculate Building Stiffness

## RE: Calculate Building Stiffness

This depends greatly on the type of structure; Are you talking about a concrete shear wall or concrete moment frame structure?

## RE: Calculate Building Stiffness

## RE: Calculate Building Stiffness

What purpose are you going to apply this to? I presume you know the precise force used to pull the building to the 2mm reflection, or is that the problem?

## RE: Calculate Building Stiffness

## RE: Calculate Building Stiffness

## RE: Calculate Building Stiffness

## RE: Calculate Building Stiffness

## RE: Calculate Building Stiffness

Biaxial Analysis and Design of arbitrary cross sectionsReinforcement design to all major codesMoment Curvature analysis

http://www.engissol.com/cross-section-analysis-des...

## RE: Calculate Building Stiffness

I would assume that types of materials in your model is consistent. Therefore, your modulus of elasticity (a material property) does not change in the model.

The stiffness of the building (in this example anyway)is a linear value that you can calculate directly from your pull test. K = Force / Deflection. If you know that your pull force deflected your model 2mm...then you should be all set.

Now, if you are trying to model the behavior of an actual building (that will contain actual people), I doubt that this model testing will be able to provide for a safe, code compliant structure.

"We shape our buildings, thereafter they shape us." -WSC

## RE: Calculate Building Stiffness

## RE: Calculate Building Stiffness