Study On System Transformation Control And Cable Tensions Identification Of Self-anchored Suspension Bridge

In recent years more and more self-anchored suspension bridges had been built due to its beautiful shape, adaptability to geological and topographic conditions and expense is lower when used in a certain range of span. The construction method of constructing girder before erecting cable make its system transformation become an important stage of construction process. Although many elf-anchored suspension bridges have been built in our country, there is still not has a general method for its system transformation inspecifically of the hanger tension. Each elf-anchored suspension bridge has its proprietary echeme hanger tension. So it is necessary to do some studies toward this direction.This article based on project of Jilin Wusong self-anchored suspension bridge.The whole process of system transformation control and analysis are studied in this article. To make out a concrete scheme of hanger tension the reasonable design state should be first determined. The shape of main cable, the length of cable and the cable force can be alculated. In the system transformation of Wusong elf-anchored suspension bridge, we monitoring and control the main cable curve, the displacement of the main towers, main beam linear, the cable force and the Stress. By analysis and calculating the monitoring data we can know the inner force variation and alignment change of the bridge in system transformation and ensuring safety in system transformation.we also can optimization and adjustment echeme hanger tension by this monitoring data.In the Construction Process we should find a simple, rapid and precise method for calculating the cable force. This paper provides a detailed analysis and comparison of the formulas of the cable force have been gaven, and it can be found that there are great errors when use these formulas. It is necessary to study a new formula of the cable force which can use on Wusong elf-anchored suspension bridge. On the basis of formulas which were derived by string theory and beam theory, analysising the feasibility of vibration model of three segment uniform hangers. Correcting the formula of cable force by introduce a correction coefficient of cable length. By using the measured amplitude-frequency and measured cable force to verify this new formula is available.