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https://hdl.handle.net/2142/20412
Description
Title
Time-dependent analysis of cable-stayed bridges
Author(s)
Shaukat, Adeel
Issue Date
1993
Doctoral Committee Chair(s)
Foutch, Douglas A.
Department of Study
Civil and Environmental Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Applied Mechanics
Engineering, Civil
Language
eng
Abstract
Cable-stayed bridges are constructed using the cantilever method of construction and generally take a long time to build. In a concrete cable-stayed bridge, concrete properties change with time causing a change in the position of the neutral axis. In different parts of a concrete bridge creep and shrinkage develop at different rates which depend upon various environmental factors and the intrinsic properties of the concrete. In bridges with a variable depth to the soffit, the analysis requires the use of average cross section properties of each element.
Within the premise of the Euler-Bernoulli beam theory, a procedure has been developed to calculate the flexibility and stiffness matrices of nonprismatic beam-column elements with reference to an arbitrarily chosen reference axis. New shape functions have been developed for the nonprismatic beams to interpolate the axial and transverse displacements at the reference axis. The reference axis may lie outside the body of the element. The theory has been extended to incorporate geometric nonlinearity. The shape functions for nonprismatic beams yield the exact stiffness matrix for beams with variable depth. A step-by-step method is suggested to analyze structures for the effects of creep and shrinkage of concrete.
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