Design and key construction technology of steel-concrete-steel sandwich composite pylon for a large span cable-stayed bridge

Abstract

This paper introduces a new type of steel-concrete composite pylon that has been applied to Nanjing Fifth Yangtze River Bridge (a three-pylon cable-stayed bridge with a main span of 600 m). For this new type of pylon, the steel shells are connected with concrete through PBL shear connectors and studs, and the inner steel shells are connected with the outer steel shells by angle steels. Numerical analysis and full-scale model tests show that the pylon structure exhibits excellent mechanical properties and construction performance. The application of BIM technology, the research and development of special spreaders and construction platforms ensure the precise installation of structures. Highly factory-manufactured modular assembly of the reinforced steel shell structure can effectively reduce the intensity and difficulty of on-site operations, and improve the quality of the project, with low construction risks. Whereas, the successful application of this steel-concrete-steel sandwich composite pylon marks the formation of a complete set of construction technology of steel-concrete-steel sandwich composite pylon, which can be widely used in similar bridges.

Self‐Powered Intelligent Damper Integrated Triboelectric‐Electromagnetic Hybrid Unit for Vibration In Situ Monitoring of Stay Cables

“…Cable‐stayed bridges have been increasingly used in engineering practice due to its beautiful appearance, convenient construction, and large span capacity. [ 1,2 ] However, owing to the weak damping and high flexibility of the cable itself, it faces many vibration problems, such as wind and rain excited vibration and vortex vibration. [ 3 ] This may cause fatigue damage to the cable and the connection between the cable and bridge body, reducing the service life.…”

Analytical Solution for Longitudinal Anti-Push Stiffness of the Middle Tower of Cross-Cable Multi-Tower Cable-Stayed Bridge

“…Under the action of the unbalanced live load, the middle tower has a large deformation due to the lack of auxiliary piers or end anchor cables (Figure 1) [6][7][8]. To solve this problem, many scholars have thoroughly explored methods to improve the stiffness of the middle tower [6][7][8][9][10][11][12][13]. The most obvious way to achieve this is to increase the stiffness of the main beam and tower, such as the Maracaibo Bridge, Millau Bridge, and Rio-Antirio Bridge in Greece, etc.…”