Theoretical Study On The Corrosion Cycle Life Of Bridge Cable System

Since the reform and opening-up, the bridge cause gets rapid development in China, especially the building of batch of ultra-long span cable supported bridges makes our country fast stride in the bridge powerful country line. However, recent years the problem of bridge cable system endurance starts presenting, especially the cable-stayed bridge's frequent changing of cable because of corrosion inactivation in short period influences the bridge normal application life span severely. At the same time, builds-up of tremendous economic losses and personnel casualty, makes heavy bear towards our society. So study on the bridge cable system corrosion is extremely urgent and must got enough recognition.This paper is the important ingredient of "Bridge Steel Structure Component and Cable System Life Circle Design Guide Rule Study" which is the subsidiary subject of "Bridgework Life Circle Design Theory and Method Study" that belongs to Nation west traffic construction science and technology item. The paper is established in the bridge cable system. Major introduces and analyzes the cable system corrosion of cable-stayed bridge.Towards the bridge cable system corrodent destruction form and mechanics, this paper rounded introduces the bridge corrosion environment, especially does focal point analysis and introduction about atmospheric corrosion, associating the atmospheric circulation circumstances establishes region partition map of national atmospheric corrosion. Provides reference for anticorrosive design of cable supported bridges. Through investigation and analysis of the cable system corrosion inactivation, summarizes the bridge cable system corrosion inactivation age limit and failure cause etc. Puts forward the corresponding measure towards the construction design, building materials, maintenance measure and construction technology etc. Provides basis for the cable system design, keep in repair and maintenance. Analyzes the open question in cable preservation system in our country. Individual studies the selection of PE materials, compound preservation system, cable anchorage construction, anchorage device waterproof construction and cable in vitro later protection etc. Consulting the theory and method of oil and gas pipelines corrosion surplus life span forecast, basing on the reliability theory, puts forward the method and model of cable corrosion surplus life span forecast. Provides basis for establishing of cable detection cycle and maintenance decision.