Table 3: The first six calculated natural periods and frequencies after seismic strengthening with FRCM.

Modes1st2nd3rd4th5th6th

DirectionLateralLateralLateralLateralTorsionalLateral
Period (sec)0.9300.9280.1490.1480.0870.061
Frequency (Hz)1.0751.0776.7096.74311.41816.405