A New Approach for Free Vibration Analysis of Thin-Walled Box Girder Considering Shear Lag Effect

Table 4

Natural frequencies comparison for different calculation conditions (cantilever supported).

Frequency order	1	2	3	4	5	6	DOFs
A	5.092	26.074	62.307	102.459	134.845	171.185	2232
B	4.987	26.920	63.178	103.378	145.201	187.422	310
C	13.114	44.609	84.565	127.933	172.556	217.584	—
D	−8.127	−17.689	−21.387	−24.555	−27.355	−30.162	—
E	−61.97%	−39.65%	−25.29%	−19.19%	−15.85%	−13.86%	—

Note. A: ANSYS results; B: present results; C: results of not considering the SLE; D: SLE effect on natural frequencies (B–C); E: proportion of SLE effect on natural frequencies (D/C).