Study On Testing Of The Tension Of Flexible Cable

The flexible cable was usually used for hanger or stay-cable in tied arch bridge and cable-stayed bridge. The magnitude,variation and distributing of the cable tension is the basis of the important evidence of bridges. So it is significant to survey the cable tension well and truly. Because there current cable tension surveying methods which is applied in practice contain many problems, it is very necessary to deeply study these problems. Based on the practice of engneering ,the analysis methods of cable tension measuring are studied in this paper,The main tasks and results are as follows:1. The existing problem by analyzing current researches on the methods of cable tension surveying are presented.2. Such factors as stiffness,initial shape,doundary conditions and temperature of cable which have influence on the testing precision of cable tension by frequency method are analysised. Through the combination of finite element analysis and engineering examples are:the actual bending stiffness of the rigid cable closer to the wire cable to consider the loose-bending stiffness,far less than the bending stiffness of geometry,and the actual bending stiffness of cable with cable tension echanged.3. Deduce the practical calculation formulas of the cable tension by analyzing the size of the stiffness parameterξ. The bucking funtion of compreessed bars is utilized to conceive a function that can describe the second oscillation mode of fixed–end rigid cables. By means of the RITZ method ,the free frequency of the second mode of the cables are given .4. The above results which the cable tension testing is applied in the tied arch bridge and stay-cable bridge. Practice has proved that:the frequency method can meet the engineering requirement,and analysis of some issues of the frequency mothed in practice at the same time.