Seismic Study of Skew Bridge Supported on Laminated-Rubber Bearings

Table 1

First seven natural modes of the bridge.

Mode no.	Periods (s)	Frequency (Hz)	Mode description
1	2.462	0.406	In-plane rotation (right three spans)
2	2.087	0.479	In-plane rotation (left three spans)
3	1.754	0.570	Longitudinal vibration (right three spans)
4	1.430	0.699	Longitudinal vibration (left three spans)
5	1.329	0.752	Transverse vibration (right three spans)
6	1.108	0.902	Transverse vibration (left three spans)
7	0.645	1.551	Longitudinal vibration of bent 3