Theoretical Study on the Flexural Behavior of Structural Elements Strengthened with External Pre-Stressing Methods

Applied Sciences

Pavol Purcz¹  Mohamed H. El-Feky²  Gouda A. Mohamed²  Ahmed S. Eisa² 

[1] Faculty of Civil Engineering, Institute of Environmental Engineering, Technical University of Kosice, 04200 Košice, Slovakia;Structural Engineering Department, Zagazig University, Zagazig 44519, Egypt;

关键词: strengthening;    pre-stressing;    external tendon;    frames;    load capacity;    finite element;   

DOI  :  10.3390/app12010171

来源: DOAJ

【 摘 要 】

This study aims to strengthen the flexural behavior of structural elements with external pre-stressing tendons, thereby improving their load-carrying capacity and increasing their resistance against the external load. Different techniques were used to apply external pre-stressed strengthening to RC beams and RC frames. Seven identical RC frames were analyzed: an original sample without an external tendon, two strengthened samples with external tendons at the positive bending zone, two strengthened samples with external tendons at the beam–column connection zone, a strengthened sample with external straight line tendons along the beam and, finally, a strengthened sample with external U-shape tendons along the beam of the frame. The analysis and the results were obtained using ANSYS WORKBENCH finite element (FE) program. Comparisons were performed between these techniques to determine which technique is better for strengthening. The failure mode, vertical deflection, column stress, load-carrying capacity, and ductility of the samples were listed and analyzed under four-point vertical loading. The results show that using external tendons significantly increases the load capacity and the stiffness of structural frames. Moreover, the tendon in the beam zone is more effective than the tendon in the column zone.

【 授权许可】

Unknown