الفهرس | Only 14 pages are availabe for public view |
Abstract he objective of this study is to enhance the punching shear strength of flat slabs at interior column. For this purpose, an economical and easy to install strengthening method was applied to ½ scale flat slabs specimens. The proposed strengthening scheme employs the use of fabricated steel shear bolts placed around the column in different spacing and arrangements as vertical punching shear reinforcement. In addition, the effect of column aspect ratio on strengthening method was also investigated in the scope of this study. Strength increase of at least 30% was obtained for the strengthened specimens compared to the companion reference specimen. Three dimensional nonlinear finite element model was generated using ANSYS program to investigate the punching shear failure mechanism of test specimens. 3-D finite element models are successful in providing reasonable estimates of ultimate punching load capacity, load-deformation behavior and strains. Extended parametric study with new parameters was generated including new parameters. The effect of compressive strength, spacing between shear bolts, and column aspect ratio were investigated. A proposed guidelines and a design equation were generated from the parametric study results using regression analysis. The experimental punching load capacities of the specimens were compared with the estimations punching shear load given by ACI 318-14, Eurocode-2, and ECP203-2017. |