International Journal of Civil and Structural Engineering Research ISSN 2348-7607 (Online) Vol. 9, Issue 2, pp: (38-47), Month: October 2021 - March 2022, Available at: www.researchpublish.com
Comparison between Experimental, Nonlinear Finite Element Analysis Results and International Codes for Reinforced Concrete Flat Slabs Strengthened Using Different Techniques to Resist Punching Failure Hanna F. H. Habeb 1, Ahmed A. Mahmoud*2, Alaa G. Sherif 3, Magdy M.M. Genidi4 1
*Corresponding author, Tel: 20201005679172, E-mail: ahmed.ahmed@feng.bu.edu.eg, ahmed.m5882@gmail.com
Department of Civil Engineering, Faculty of Engineering at Shoubra, Benha University-, 108 Shoubra Street, Shoubra 11691, Cairo, Egypt. 2
Higher Institute of Engineering, 15th of May City, Egypt (E-mail: civil.hanafakhry@yahoo.com).
3
Professor, Faculty of Engineering (Shoubra), Benha University, Egypt (E-mail: ahmed.ahmed@feng.bu.edu.eg and ahmed.m5882@gmail.com);
4
Professor of Reinforced Concrete Structures, Civil Engineering Dept., (Structure), Faculty of Engineering El MataryaHelwan University, Cairo, Egypt (E-mail: alaa_sherif@m-eng.helwan.edu.eg and agbsherif@gmail.com);
5
Associate Professor, Civil Engineering Dept., (Structure), Faculty of Engineering El Matarya- Helwan University, Cairo, Egypt (E-mail: magdy_genedy@m-eng.helwan.edu.eg and magdy_genidi@yahoo.com).
Abstract: The main objectives of this research are to study experimentally, analytically and numerically the effectiveness of the proposed external strengthening techniques to resist punching shear of reinforced concrete flat slabs. The finite element (FE) analysis software program (ANSYS V. 19) was used to create the models and investigate the effects of some parameters on punching shear of reinforced concrete flat slabs. Eight variable parameters are taken into consideration during study full scale flat slab models to account the influence of: (1) concrete compressive strength fcu; (2) reinforcing steel yield strength fy; (3) slab thickness (ts); (4) shear studs and stirrups diameter (Db); (5) shear studs (stirrups) spacing /ts ratio (Sb/ts); (6) shear studs stirrups spacing/ts ratio (D/ ts); (7) main steel ratio/m max ( m /m max); (8) top steel ratio/m max (m` /m max).The numerical results were compared with the analytical results calculated from ECP 203-2017 [1] and ACI 318-19 [2]. The comparison showed a great match between the numerical results and the results of the two codes, especially ACI 318-19 [2]. Keywords: Punching shear, experimental, external strengthening, ANSYS program, numerical analysis.
I. INTRODUCTION A flat slab floor system is often the choice when there is a need for more clear head such as car parks, libraries and multistory buildings where larger spans are also required. Punching shear failure is a major problem encountered in the design of reinforced concrete flat slabs. Many researchers have studied the punching shear behavior of reinforced concrete flat slabs [3]. The punching shear strength and deformation capacity are strongly influenced by the type and characteristics of the shear reinforcing system [4]. The slabs punching shear reinforcing system are: (1) separated stirrups, (2) continuous stirrups, (3) bonded reinforcement with
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