Study Of Bridge Professional Maintenance Technology-Stay Cables Disease Research

In recent years cable-stayed bridge is a kind of bridge structure which is rapid development at home and abroad, has been widely popularized and applied. Stay cables as its main mechanical structure component, their diseases problems directly influence the safety and serviceability of bridge. So therefore, professional maintenance technology of stay cabls need in-depth research, we have to know the reasons of the diseases and could take effective measures to ensure the lasso safety, durability and reliability.This paper primarily makes a study of the diseases occurring mechanism of the more commonly used parallel wire cable and steel strand of the cable-stayed ,and detection methods of lasso disease. Introduce the two cables'structure systematically and comprehensively, summarize the weak area of the two lasso protective structures, and classify the common diseases in the protective weak area .compare and analyse the features of two lasso system structure,and study their reasons of damage based on the actual projects. The more depth reserch are used in corrosion of steel wire strands. By the steel wire strands accelerated in different stress conditions corrosive experiment, static tensile experiments and fatigue test , to study the mechanical properties of degradation degree.Based on studying the diseases occurred in lasso'design, production,construction, maintenance and so on, From the research of lasso'system disease,some measures can be put forward on stay-cables'design and production for improvement, and given stay-cables professional maintenance methods and suggestions; The comparison of the two lasso systems also can be used for reference of the cable-stayed selection. From the experiment ,we could realize that steel wire strands'corrosion rate increse heavily in stress state, the mechanical property of corrosive strands degenerate obviously,especially its anti-fatigue capability decline seriously.