Seismosoft | Earthquake Engineering Solutions

Dear Seismosoft,
I have installed the new version (v7) of Seismostruct and thank you for the new release of the software.
I’m performing a dynamic time history analysis (DTHA) for a precast industrial building with considering the structure in three dimensions and the three components of ground motion. I’m also taking the flexible foundations into consideration by assigning link elements under columns. The eigenvalue analysis and the DTHA of the model are running fine. I’m no longer having the problem with the stiffness proportional damping which I had before in version 6.5.
However, the static pushover analysis (SPA) encounters a problem. The “Problem encountered in the solution in the controlled DOF procedure.” warning box appears following with a warning in the analysis log “current control type terminated”.
I’m trying to perform the SPA via static time history analysis (STHA) by applying the same displacement procedure with using the same nodes. The analysis stops after the “Unable to apply the next load step. Analysis terminated.” warning appears in the analysis log.
The top displacement vs base shear relationship achieved from both analyses are almost the same except the top displacement values. The displacement that is reached in the STHA is greater than the one that is reached in the SPA, but both of the displacement values are below the expected value.
Best regards.

Dear Soydan,

We had a look at the model that you sent us, thank you. We note that one of the most common reasons for divergence problems is the use of very short force-based elements with many monitoring points. Further, we would also replace the elastic frame elements that you use to model offsets, with the frame element offsets feature of SeismoStruct.
Finally, note the differences that might arise with the introduction of shear reinforcement and the automatic calculation of confinement factors.

Seismosoft Support