A Study on Time Dependent Behavior of Cable-Socket Systems

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It is essential for the design and maintenance of the cable-stayd bridges to know the long-term behavior due to the visco-elastic deformation of the cable strands, the cable sockets, the concrete members and the ground settelment at the supports. This research deals with the time-dependent behavior of cable strands and sockets, and a methodology to predict the long-term change of bridge geometry, particularly change of cable forces which is applied for construction management and maintenance after completion. First, the full-scale long-term tention tests of various cable systems are briefly reviewed and the visco-elastic deformation of the cable strands and sockets are summarized together with determination of viscoelastic constants. Secondly, the method to determine the visco elastic constants of cables and sockets either for short time prediction or long term prediction, and the finite element visco-elastic analysis together with the Laplace transformation are proposed for better prediction and general usage including several visco-elastic elements. Thirdly, the loading test for the bond-slip out behavior of cable strands from cable sockets, namely, Zinc-Copper poured socket, is carried out and its analytical prediction is made by the distinct element method.