Abstract:This project systematically studied and designed the reasonable cross-sectional form of the wide span main beam of a large-span prestressed concrete partially cable-stayed bridge, summarized the mechanical performance of the box shaped main beam with a large cantilever stiffening diaphragm, and proposed targeted durability and crack prevention measures for the wide span main beam; We have developed a new unilateral bidirectional anti slip anchoring system for some cable-stayed bridges, and conducted a single steel strand replacement test by simulating a real bridge, which can truly make the cable-stayed cables of some cable-stayed bridges replaceable and detectable

Abstract:Reactive powder concrete (RPC), as a new type of concrete material, has good application prospects in bridge engineering due to its excellent material properties. This article introduces the basic properties and research status of RPC materials, and lists application examples of bridge engineering at home and abroad

Abstract:The Songyuan Tianhe Bridge adopts a new type of large-angle and long adjustable suspension cable anchoring method, which results in the suspension rod tensioning being different from the ordinary beam support tensioning. Ordinary tensioning tools cannot meet the tensioning requirements, therefore, a new tensioning system that can meet the construction requirements needs to be designed based on the characteristics of this project. This tensioning system has been proven to be effective after application in engineering, and can provide relevant experience and reference for the conversion construction of similar bridge systems in the future

Abstract:The use of uniformly distributed pressure dispersed anchor cables in the reinforcement of weak rock and soil effectively avoids prestress loss, solves the problem of uneven stress on other forms of anchor cable steel strands, and improves the safety of anchor cable stress. The use of magnetic flux sensor measurement system for online remote monitoring technology can monitor the change process of anchor cable prestress in real-time after installation, effectively control the working conditions of slope stress field, and intelligently evaluate its health status

Abstract:Cable is the core component of cable supported bridges, and how to effectively detect and evaluate the safety of bridge cables is a topic worth studying. This article is based on the commonly used cable structures, analyzes the failure forms and parts based on the study of their disease characteristics, and proposes to focus on detecting the vulnerable parts of the cable based on the failure forms. The safety assessment of existing cables mainly compares the relationship between load levels and structural resistance. The article summarizes the existing methods for detecting cable load levels and cable structural resistance, and points out the applicability of various detection methods. Based on the failure forms of cables, an effective detection program and method for cables are proposed, and further safety assessment methods and strength status indicators for cables are proposed. The research results in the article are conducive to providing guidance for cable inspection and evaluation work, and can simplify the workload while ensuring structural safety

Abstract:The comfort of pedestrian bridges has become an important indicator in landscape bridge design. This article takes a pedestrian landscape bridge project in a certain scenic area in China as an example, and uses Midas Civil finite element analysis software to establish a three-dimensional finite element model. The structural dynamic characteristics and human induced vibration response of the bridge are analyzed. The time-history response results of human induced vibration acceleration indicate that the comfort of the bridge does not meet the requirements of the design and specifications. Therefore, a vibration reduction design scheme using an eddy current tuned mass damper (TMD) was proposed, and the effectiveness of the vibration reduction was evaluated through practical engineering, confirming the feasibility of the scheme

Abstract:Bridge cables play a very important role in the structure, so owners have extremely high durability requirements for them. Currently, high-density polyethylene sheath materials are widely used for surface protection of the main load-bearing bars of cables, and the anti-corrosion performance of the outer sheath is the first line of defense related to its lifespan. This article analyzes and tests the problems that occur in the coil of the cable from many factors that affect its anti-corrosion performance, Propose measures and opinions to ensure the anti-corrosion durability of the cable

Abstract:At present, the maintenance of long-span Suspension bridge involves less engineering practice of cable clamp replacement, and its replacement faces many engineering problems that need to be solved urgently. Based on the example of cable clamp replacement project of a long-span Suspension bridge, this paper introduces the selection and design essentials of temporary facilities for cable clamp replacement of a long-span Suspension bridge; And the construction process of rapid cable clamp replacement was emphasized, which has been proven by engineering practice to be safe and effective in achieving rapid cable clamp replacement. At the same time, this practice can provide reference for the design and construction of similar bridge type cable clamp replacement