Abstract
A major concern when installing the cables into the underground conduit is minimizing the tensile forces exerted on the cables as they are pulled. This knowledge makes it possible to avoid over conservative design practices and to achieve substantial saving during construction. A general computing algorithm of predicting the tensile force of the cable pulled through the underground conduit with an arbitrary configuration is presented in this paper, which is based on multibody system dynamic formulation. The presented multibody dynamic model for this problem consists of the cable, the underground conduit, and the interaction between the cable and the conduit. In this paper, the cable is modeled by the finite cable element based on an absolute nodal coordinate formulation. The interaction between the cable and the underground conduit is described by the Hertz contact theory. Numerical examples are presented to illustrate the effectiveness and efficiency of the proposed method for estimating the cable tension.
Highlights
Nowadays, power cables, fiber optic cables, and other in-building communication cables are often placed in the underground conduit
The tensile force exerted on the cables when they are pulled in the conduit system is a major concern in cable installation
The objective of this study is to develop a general computing algorithm of predicting the tensile force of the cable when pulled into the conduit of arbitrary configuration
Summary
Power cables, fiber optic cables, and other in-building communication cables are often placed in the underground conduit. In 1996, Mircea Iordanescu [3] presented an analytical model incorporating the bending stiffness of the cable to predict the maximum pulling force exerted on the cable during the cable installation. This model considers the geometrical and physical nonlinearity of the behavior of the cable in bending and subjected to high tension. The objective of this study is to develop a general computing algorithm of predicting the tensile force of the cable when pulled into the conduit of arbitrary configuration To achieve this goal, a multibody dynamic model composed of a flexible cable, the rigid conduit and the contact between the cable and the underground conduit is presented in this paper.
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