Seismosoft | Earthquake Engineering Solutions

Does anyone know whether the output acceleration of a node of a structure, obtained after dynamic time history analysis is Relative or Absolute? For output displacements and velocities, we can choose between relative and absolute. But the same tab is inactive for output acceleration. So what exactly it is: Absolute acceleration or Reative acceleration to the ground?

The option check-box you refer to is named 'Relative Values', hence when such option is not activated (either due to a user-choice (possible in displ/veloc) or due to a program's constraint (in the case of acc)) it means that the results will be given in absolute terms. In other words, SeismoStruct outputs absolute acceleration values.

SeismoSoft Support

thanks a lot for your quick reply...