Abstract
Combined with the engineering background of a 5000-meter Strait Suspension Bridge, the configuration study of the hyperbolic parabolic space cable suspension bridge was carried out, and the ANSYS finite element analysis model was established to analyze and study the structural internal force and dynamic modal characteristics. The research shows that the hyperbolic parabolic space mixed cable suspension bridge has excellent spatial stiffness and wind stability performance, its torsional frequency and torsional frequency ratio are significantly improved, the critical wind speed of flutter is greatly improved. In order to further improve the wind stability of the hyperbolic parabolic space mixed cable suspension bridge, temporary wind resistance cable measures adopted during strong typhoons are proposed. This method can ensure that the 5000-meter-level hyperbolic parabolic space mixed cable suspension bridge has the ability to withstand 120 m / s rare extreme typhoons.
Highlights
As the span of the suspension bridge continues to increase, the structure tends to be softer, and its torsional frequency and torsion-bending ratio continue to decrease[1,2]
The key point to improve the overall rigidity of the suspension bridge structure should be placed on the main cable
The use of a three-dimensional spatial cable suspension bridge structure system can effectively improve the wind-resistant stability of super-span suspension bridges [7,8]
Summary
As the span of the suspension bridge continues to increase, the structure tends to be softer, and its torsional frequency and torsion-bending ratio continue to decrease[1,2]. The structural rigidity of the super-span suspension bridge mainly comes from the main cable[5,6]. The key point to improve the overall rigidity of the suspension bridge structure should be placed on the main cable. The use of a three-dimensional spatial cable suspension bridge structure system can effectively improve the wind-resistant stability of super-span suspension bridges [7,8]. Parabolic mixed space cable suspension bridge, and explore the advantages of the wind-resistant stability of the hyperbolic parabolic mixed space cable suspension bridge. This paper provides a theoretical basis for the construction of the super-long-span suspension bridge in the future
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