Analytical Model and Analysis of Post-Tensioned Continuous Composite Beams
Publication: Structures Congress 2023
ABSTRACT
In this paper, an analytical model is proposed, where the nonlinear material behaviors of steel and concrete are adopted. The proposed model is carried out by the computer software MATLAB to run the iterations to satisfy the equilibrium of the internal forces in the post-tensioned composite sections. Test data for full-scaled steel-concrete continuous composite beams are used to calibrate the proposed model. The influences of the post-tensioning and steel beam grade on the post-tensioned continuous composite beam behavior are investigated. The steel rebar strain is reduced by 84% at the cracked moment and starts to yield when the moment on the strengthened beam is 9.3% higher than that moment on the unstrengthened beam. The initial compressive strain created by the external post-tensioning helps to relieve part of the tensile strain in the concrete flange and then improves the cracking resistance of the concrete. Higher stiffness is obtained in the case of carbon steel relative to the stainless steel case. Moreover, the yielding moment is reduced by 16.3% when using stainless steel. However, the ultimate deformation is improved by 53% relative to the carbon steel grade.
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Structures Congress 2023
Pages: 85 - 94
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Published online: May 1, 2023
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