Influence of Water-Structure and Soil-Structure Interaction on Seismic Performance of Sea-Crossing Continuous Girder Bridge

Table 3

Fundamental periods and the elongation ratios.

Item	Case 1	Case 2	Case 3	Case 4
Fundamental period (s)	1.71	1.74	3.18	3.23
Change rate (%)	—	1.8 (relative to Case 1)	86.0 (relative to Case 1)	1.6 (relative to Case 3)