Neglect Masses

Tips & Tricks

In the DYNAM Pro add‑on module for RSTAB, it is now possible to neglect masses, which may have a negative effect on the equivalent mass factor when calculating eigenvalues. For this, you can disable the masses under [Details]. These include primarily mass points located in the support of the structures.

Problem explanation and solution: So far, all masses of a structure were used in the eigenvalue analysis. In certain structures, this may cause the equivalent mass factor usually used for the seismic design to not reach 90% of the total mass as the masses cannot oscillate in the supports (due to the boundary conditions). This new option allows you to simply set these masses to zero, which causes the equivalent mass factor to increase so it can easily reach the 90% of the total mass.

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