Abstract:Due to structural defects and improper corrosion protection measures in traditional suspension bridge main cable systems, almost all suspension bridge main cable systems worldwide have varying degrees of corrosion in their main cable steel wires. This paper proposes for the first time to change the original open main cable structure to a closed main cable structure, and apply the mature OTC (Oxidative Polymerization Coating Corrosion Protection Technology) and PTC (Multilayer Mineral Grease Coating Corrosion Protection Technology) technologies of the National Marine Corrosion Protection Technology Engineering Research Center of the Institute of Oceanology, Chinese Academy of Sciences, to effectively block the corrosion pathways of suspension bridge main cable systems, improve the corrosion protection performance of suspension bridge main cable systems, and reduce the technical difficulty of maintaining suspension bridge main cable systems, thus meeting the design life requirements of suspension bridge main cable systems.

Abstract:In order to study the application of fiber Bragg grating prestressed carbon fiber sheets in actual bridge reinforcement projects and their working mechanism with concrete, a continuous beam bridge in Shandong Province was taken as an engineering example. Using on-site reinforcement, load testing, and finite element analysis methods, load tests were carried out before and after reinforcement, and the test results before and after reinforcement were compared. The results show that the cooperative working ability of fiber Bragg grating prestressed carbon fiber sheets and concrete beams is good, and it has a significant effect on improving the bearing capacity of bridges.

Abstract:The National Astronomical Observatory of the Chinese Academy of Sciences used the Guizhou Karst Depression as the site to erect a 500m diameter spherical reflector in the depression, and built the world’s largest and most sensitive radio telescope, FAST. According to the requirements of this project, this paper developed a finished cable made of ultra-high fatigue performance steel strands that can withstand a stress amplitude of 500MPa. The test results show that this type of cable system has good static load performance and high fatigue life, greatly improving the reliability and durability of the steel strand cable system.

Abstract:This paper introduces the application progress of response surface method in reliability analysis and proposes an iterative response surface method based on high-dimensional model representation (HDMR) expansion. After detailing the basic principles of calculating structural reliability using HDMR response surface method, several numerical examples are calculated using Matlab language, and the results of other calculation methods are given for comparative analysis. The results show that the method proposed in this paper has high efficiency and reliable accuracy, and has certain practicality in structural reliability analysis.

Abstract:The multi-strand finished cable anchor anchoring system has the advantages of reliable anchoring, good corrosion protection, convenient construction, and low life cycle cost, and will be increasingly recognized. This paper introduces the experimental research on this new type of prestressed anchor anchoring system and the research on its corrosion protection technology.

Abstract:This paper, combined with an example of an old bridge maintenance project, introduces the selection, system composition, and design key points of each component of a clamp-type temporary hoisting system for replacing hangers in a bottom-bearing steel pipe truss concrete arch bridge, and verifies it through theoretical calculation and test conditions using finite element programs. In addition, it focuses on the installation and construction technology of the temporary hoisting system. The engineering practice has proved that the clamp-type temporary hoisting system can safely and effectively achieve the replacement of hangers. At the same time, this practice can provide reference for the design and construction of similar bridge type hanger replacement and similar temporary hoisting systems.

Abstract:Cable-stayed bridges have made significant progress in recent years. Computer software has developed, and steel materials and construction methods have also improved. It is predicted that the number of cable-stayed bridges to be built in the future will exceed that of suspension bridges. Cable-stayed bridges are composed of many components (beams, towers, and cables). Towers and beams can be built on existing concrete or steel structures. However, the problems of corrosion protection and wind vibration of cable stays have not been completely solved. This paper introduces the development process of effective cable stay corrosion protection and anti-wind vibration technology.