## Help me to finding out the shear forces and bending moments of each column

## Help me to finding out the shear forces and bending moments of each column

(OP)

Hello everyone, I have modelled a 4 storey building in SAP2000 using response spectra. It gives displacements at each storey level, shear forces and bending moments of each column.

I estimated the displacements at each storey level using the mass matrix and stiffness matrix provided by SAP2000 using MATLAB. But, I faced difficulties to finding out the shear forces and bending moments of each column.

I want to know, how SAP2000 estimated the shear forces and bending moments of each column for a particular load case (say, Earthquake load in X-direction)?

Thank you.

I estimated the displacements at each storey level using the mass matrix and stiffness matrix provided by SAP2000 using MATLAB. But, I faced difficulties to finding out the shear forces and bending moments of each column.

I want to know, how SAP2000 estimated the shear forces and bending moments of each column for a particular load case (say, Earthquake load in X-direction)?

Thank you.

## RE: Help me to finding out the shear forces and bending moments of each column

## RE: Help me to finding out the shear forces and bending moments of each column

I have the peak response at each storey. My problem is, how SAP2000 estimate the shear forces and bending moments at each column.

## RE: Help me to finding out the shear forces and bending moments of each column

Doug Jenkins

Interactive Design Services

http://newtonexcelbach.wordpress.com/

## RE: Help me to finding out the shear forces and bending moments of each column

I have done that, but it gives me some other values and it is not matches with the shear forces and bending moments given by SAP2000 results.

If I do the cumulative summation, it gives me the storey shear. I think the problem is my stiffness matrix.

I am taking the stiffness matrix given by SAP2000 for modal analysis. Is it fine to take as global stiffness matrix?

## RE: Help me to finding out the shear forces and bending moments of each column

Are you sure that the deflections you are using are for the same load combination as the beam actions you are comparing hem with? If you can post an example of your calculations, it might give some idea what is causing the discrepancy.

Doug Jenkins

Interactive Design Services

http://newtonexcelbach.wordpress.com/

## RE: Help me to finding out the shear forces and bending moments of each column

The problem here is, the stiffness matrix I have is consisting of active DOF's only i.e., no constrained and no restrained DOF's are there. This stiffness matrix is sufficient for calculate the displacement but not for the shear forces and bending moments.

I wonder how SAP2000 is doing this?

Deepti Ranjan Majhi

Research scholar, PhD

IIT Roorkee

## RE: Help me to finding out the shear forces and bending moments of each column

Doug Jenkins

Interactive Design Services

http://newtonexcelbach.wordpress.com/

## RE: Help me to finding out the shear forces and bending moments of each column

I really appreciate your help.

Deepti Ranjan Majhi

Research scholar, PhD

IIT Roorkee