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Parametric Study on Dynamic Behavior of Post-Tensioned Beams Using Nonlinear Finite Element Modeling
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Parametric Study on Dynamic Behavior of Post-Tensioned Beams Using Nonlinear Finite Element Modeling
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Journal Article
Parametric Study on Dynamic Behavior of Post-Tensioned Beams Using Nonlinear Finite Element Modeling
2022
Overview
A parametric study was performed to understand the behavior of unbonded post-tensioned concrete beams under low-velocity drop-weight impact. Nonlinear finite element dynamic analysis was used for the simulation of both shear- and flexural-critical members. The modeled design parameters incorporated various concrete strengths, spacing of transverse reinforcement, and increasing levels of post-tensioning force. All beams were simulated under impact at four levels of impacting velocity of the drop hammer. Results of the parametric study were used to identify critical design and loading conditions on the dynamic behavior of unbonded post-tensioned members. Post-tensioning was shown to be beneficial for both shear and flexural resistance against low-velocity impact, and a static shear-to-flexural capacity ratio of at least 5 was found to prevent large shear failure. Additionally, the study was useful at correlating prior experimental results on the behavior of unbonded post-tensioned members, as well as developing the relationship between the peak deformation and the impacting energy and static design capacity with conservativeness.
Publisher
American Concrete Institute
