Chapter
Aug 6, 2013
A Stochastic Finite Element Approach to Determine the Safety of Suspension Bridge Cables
Authors: A. Montoya [email protected], R. Betti [email protected], G. Deodatis [email protected], and H. Waisman [email protected]Author Affiliations
Publication: Computing in Civil Engineering (2013)
Abstract
A new methodology to determine the safety of suspension bridge main cables is proposed and illustrated on a corrosion-deteriorated cable composed of 9061 wires. The approach is the first one incorporating a finite element (FE) model to predict the cable's failure load, accounting for load recovery due to friction in broken wires and simulating the reduced cable's strength as a three-dimensional random field. In order to obtain the breaking load of a cable, the load is increased gradually (quasi-static loading) in a cable's FE model, having wires break a few at a time according to their residual strength. Because of the load transfer to surrounding wires, the breakage of an individual wire affects the stress state inside the surrounding wires. This local damage eventually causes a global reduction in the load-carrying capacity of the cable, up to a complete failure. The safety of the cable is determined through a Monte Carlo simulation, in which the reduced strength of the cable is generated for every realization through the Spectral Representation Method (SRM) and is input as a material parameter in the FE model. The statistics of the load that will drive a suspension bridge cable to failure under a hypothetical deterioration state are obtained at the end of the simulation.
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© 2013 American Society of Civil Engineers.
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Published online: Aug 6, 2013
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University of Texas at San Antonio, Department of Civil and Environmental Engineering,One UTSA Circle, San Antonio, TX 78249. E-mail: [email protected]
Columbia University, Department of Civil Engineering and Engineering Mechanics, 500 West 120th Street #610, New York, NY 10027. E-mail: [email protected]
Columbia University, Department of Civil Engineering and Engineering Mechanics, 500 West 120th Street #610, New York, NY 10027. E-mail: [email protected]
Columbia University, Department of Civil Engineering and Engineering Mechanics, 500 West 120th Street #610, New York, NY 10027. E-mail: [email protected]
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