Influence of Excitation on Dynamic System Identification for a Multi-Span Reinforced Concrete Bridge

Table 9

Natural frequencies and mode shape MAC values from simplified truck excitation.

Analysis case	Natural frequency [Hz]			Mode shape MAC values
	Mode 1	Mode 2	Mode 3	Mode 1	Mode 2	Mode 3
Eigenvalue	2.480	4.024	5.695	—	—	—
PV1 (54 km/h)	2.483	3.719	5.704	0.9948	0.996	0.7375
PV1 (81 km/h)	2.319	3.810	5.342	0.98	0.9446	0.745
PV4 (54 km/h)	2.105	3.302	5.498	0.9754	0.5457	0.891
PV4 (81 km/h)	2.511	3.672	5.417	0.994	0.9847	0.7782