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

Table 5

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

Frequency order	1	2	3	4	5	6	DOFs
A	13.397	46.745	87.077	123.913	167.073	194.358	2232
B	13.607	46.598	86.500	128.141	170.199	212.177	310
C	13.824	48.808	93.089	139.796	186.585	232.879	—
D	−0.217	−2.210	−6.589	−11.655	−16.386	−20.702	—
E	−1.57%	−4.53%	−7.08%	−8.34%	−8.78%	−8.89%	—

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).