Influence of Soil-Structure Interaction on the Seismic Response of a Continuous Bridge with Friction Pendulum System

Table 3

Comparison of the modal periods under different radii of FRS.

FRS radius (m)		Bridge vibration modes
		1	2	3	4	5	6
1	FEA with SSI	2.20	2.17	1.65	0.24	0.23	0.22
	FEA without	2.15	2.14	1.64	0.25	0.17	0.16
	Difference	2.32%	1.40%	0.61%	4.00%	35.3%	37.5%
2	FEA with SSI	3.03	3.01	2.30	0.25	0.24	0.22
	FEA without	3.00	2.99	2.26	0.26	0.17	0.16
	Difference	1.00%	0.67%	1.77%	3.85%	41.2%	37.5%
3	FEA with SSI	3.72	3.70	2.84	0.25	0.24	0.22
	FEA without	3.69	3.68	2.64	0.26	0.17	0.16
	Difference	0.81%	0.54%	7.58%	3.85%	41.2%	37.5%
4	FEA with SSI	4.18	4.16	3.23	0.26	0.25	0.22
	FEA without	4.15	4.15	3.20	0.26	0.17	0.16
	Difference	0.72%	0.24%	0.94%	0%	47.1%	37.5%