Journal of Lanzhou University of Technology ›› 2023, Vol. 49 ›› Issue (4): 122-128.

• Architectural Sciences • Previous Articles     Next Articles

Stress calculation of spherical hinge contact surface in swivel system of long-span bridge

LI Tian-ping1, LI Wen-zhou2   

  1. 1. Department of Architectural Engineering,Gansu Vocational College of Architecture, Lanzhou 730050, China;
    2. Gansu Province Highway Traffic Construction Group Co. Ltd., Lanzhou 730030, China
  • Received:2023-02-28 Online:2023-08-28 Published:2023-08-29

Abstract: In order to study the contact problem of the spherical hinge contact surface under normal load during the rotation construction of large span bridges, the rotation contact surface was simplified based on Hertz theory. First, the mechanical characteristics of the spherical hinge were systematically analyzed, and the contact characteristics of the micro convex bodies between the rotation contact surfaces were studied. The calculation formula for the internal stress of the rotating contact surface was then derived, followed by the analysis of the stress distribution in the rotating contact surface, and the description of the stress distribution characteristics of the rotating contact surface. Afterward, the contact stress was calculated by extending a single pair of micro convex bodies to the contact surface of the rotating body. The results show that at the contact interface, the radial stress increases with the increase of the distance from the center of the spherical joint, and the compressive stress of the upper and lower spherical joints presents the characteristics of small middle edges and large edges. Finally, the theoretical model was compared with the numerical simulation results, and the theoretical results are in good agreement with the numerical simulation results (error<5%), which provides theoretical guidance for the designation and manufacturation of spherical joints, improving the safety of swivel construction, and promoting the further development of swivel construction technology towards large span diameter and large tonnage.

Key words: bridge engineering, rotating system, contact interface, mechanical properties, contact stress

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