Auxiliary Piers on Long-Span Specially Shaped Mixed Steel Structure Main Tower Cable-Stayed Bridge: Research on the Impact on the Dynamic Performance

Table 2

Natural frequency and deformation characteristics of Model 2.

Order	Natural frequency (Hz)	Increment of the natural frequency compared with that of Model 1 (%)	Deformation characteristics
1	0.75	11.9	First-order Y-bending of the main beam
2	0.94	19.0	First-order Y-bending of the main beam
3	1.73	13.8	First-order Z-direction bending of the main beam
4	2.16	10.2	Torsion and bending of the main beam
5	2.21	12.2	Second-order Y-direction bending of the main beam
6	2.33	14.2	Y-curved main tower
7	2.47	8.8	X-direction bending of the main tower
8	2.83	19.4	First-order Z-direction of the main beam + X-direction bending of the main tower