Ultimate performance of two-way reinforced concrete flat slabs enhanced by SHCC drop panels mitigating punching failure

Faculty Engineering Year: 2025
Type of Publication: ZU Hosted Pages:
Authors:
Journal: Journal of Building Engineering Elsevier Volume: 99
Keywords : Ultimate performance , two-way reinforced concrete flat    
Abstract:
Reinforced concrete (RC) flat slabs are commonly introduced in medium-rise buildings because of their constructional and architectural benefits. However, the tensile brittleness of normal concrete can lead to progressive collapse in such RC structure, triggered by punching shear failure. The failure for such slabs is a significant concern. So, this study addresses it through experimental identification and numerical analysis to enhance the safety and sustainability of buildings. This paper investigates the effectiveness of strain hardening cementitious composites (SHCC) drop panels in enhancing the punching shear resistance of two-way RC slabs. The study aims to study various strengthening strategies incorporated within the SHCC panels, including glass fiber reinforced polymers (GFRP) mesh, galvanized steel mesh (GSM) reinforcement, and the impact of anchor bolts. Nine two-way flat slabs have been studied. The main studied parameters were: panel thickness, type of reinforcing mesh, and use of anchors. Experimental tests on slab specimens, coupled with numerical simulations, validate the findings. The results reveal significant improvements in all strengthened configurations compared to non-strengthened slabs. These improvements encompass increased stiffness, first-crack load, ultimate load capacity, and energy absorption capability. Thicker SHCC drop panels and the use of anchor bolts yielded the most dramatic enhancements. Furthermore, GSM reinforcement demonstrated superior performance compared to GFRP mesh across all configurations. GSM mesh outperformed GFRP mesh, especially in stiffness (up to 237 % increase) and energy absorption (up to 249 %). Interestingly, anchor bolts proved beneficial regardless of panel thickness or mesh type. Increasing the number of anchors from 4 to 12 to 16 resulted in load increases by 50.80 %, 51.90 %, and 53.50 %, respectively. While all slabs exhibited similar cracking patterns, the point of initial cracking and the overall failure load varied depending on the specific strengthening method employed.
   
     
 
       

Author Related Publications

  • Mohammed Reda Ali Elewa, "Flexural response and load capacity of reinforced concrete beams strengthened with reinforced mortar layer", Elsevier, 2021 More
  • Mohammed Reda Ali Elewa, "Experimental and theoretical study on the compressive strength of the high strength concrete incorporating steel fiber and metakaolin", Elsevier, 2021 More
  • Mohammed Reda Ali Elewa, "Behavior of ECC columns confined using steel wire mesh under axial loading", Elsevier, 2021 More
  • Mohammed Reda Ali Elewa, "Effect of Cement Alternative on the Mechanical Properties of Self Compacting Concrete Using Variable Aggregate Types", Faculty of Engineering - Zagazig University, 2011 More
  • Mohammed Reda Ali Elewa, "Effect of sustained loading and environmental conditions on the creep behavior of an epoxy adhesive for concrete structures strengthened with CFRP laminates", elsevier, 2017 More

Department Related Publications

  • Eshak Ibrahiem Eshak Hana, "Dynamic Effect of Trains on Multispan Railway Bridges", لايوجد, 1900 More
  • Eshak Ibrahiem Eshak Hana, "Dynamic Effect of Trains on Multispan Railway Bridges", 9th International Colloquium on Structural and Geotechnical Engineering, Ain Shams Univ., Cairo, Egypt, 10-12 April 2001., 2001 More
  • Eshak Ibrahiem Eshak Hana, "A Robust Nonlinear Mathematical Programming Model for Design of Laterally Loaded Orthotropic Steel Plates", Structural Engineering and Mechanics, Vol.14, No.2 (2002) 223-236, Techno-Press, Korea., 2002 More
  • Eshak Ibrahiem Eshak Hana, "Effect of Temperature Variation on Bridges due to Locking of Movable Bearings and Expansion Joints", 1st Eng. Conference, Engineering Between Theory and Practice, Assuit Univ., Faculty of Eng., Egypt, 7-8 May 2007., 2007 More
  • Eshak Ibrahiem Eshak Hana, "Effect of Partial Fixity of Bearings on the Structural Behaviour of Bridges", The 13th International Conference on Civil, Structural and Environmental Engineering computing, Greece, 6-9 Sept. 2011., 2011 More
Tweet