Abstract
This paper presents the results of numerical simulations on three main factors and their influence on the buckling resistance of reinforcing bars and on their behaviour in the range of postcritical deformations. These three factors are the shape of initial deformation, the amplitude of geometric imperfection and the slenderness of bars. The analysis was made of bars fixed on both sides for three initial shapes of deformation between adjacent stirrups, four amplitudes of geometric imperfections and eight bar slendernesses. The results of the numerical analyses carried out showed that the factors analysed have a very high influence on the inelastic buckling of the bars. The initial deformation shape, the radius of curvature and the slenderness of the bars have a significant influence on the buckling resistance of these bars and their longitudinal and transverse deformations. The research demonstrates that bars which are bent or compressed initially have a smaller resistance to buckling compared to straight bars, as the amplitude of geometric imperfections increases and the slenderness of the members increases. However, for the deformation shape of the bars, which is accompanied by shear forces, the drop in the buckling resistance of the members is small, and resistance to buckling for items with a small slenderness was higher than that of straight bars.
Highlights
The impact of seismic and exceptional loads on reinforced concrete structures may lead to the occurrence of postcritical states in structural elements
The research demonstrates that bars which are bent or compressed initially have a smaller resistance to buckling compared to straight bars, as the amplitude of geometric imperfections increases and the slenderness of the members increases
In order to avoid too-early buckling of the longitudinal reinforcement bars, the longitudinal and transverse reinforcement must be adequately arranged in the plastic hinge
Summary
The impact of seismic and exceptional loads on reinforced concrete structures may lead to the occurrence of postcritical states in structural elements. In the case of the analysis of reinforced concrete elements in a state of postcritical deformations, when the limit of deformations of the cover concrete are exceeded and at the same time, the deformations of the reinforcement are large, it should be considered that the compressive reinforcement works differently than the tensile reinforcement This difference requires the use of a corresponding reinforcement model and appropriate constitutive laws for compressed bars, which are different from those for tensile bars. Materials 2020, 13, x FOR PEER REVIEW deformations of the bars caused bybars the acting loads thatacting accompany transmitted to the initial deformations of the caused by the loads the thatcompressive accompanyforces the compressive to the longitudinal bars. Paper, is to examine the influence of the initial deformation of the bars, the amplitude slenderness on the buckling resistance of the reinforcement bars.resistance of the reinforcement bars
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
