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Structural Monitoring and Maintenance
  Volume 10, Number 1, March 2023 , pages 001-23

Response of two-way reinforced concrete voided slabs enhanced by steel fibers and GFRP sheets under monotonic loading
Adel A. Al-Azzawi and Shahad H. Mtashar

    Various efforts have been made to reduce the weight of concrete slabs while preserving their flexural strength. This will result in reducing deflection and allows the utilization of longer spans. The top zone of the slab requires concrete to create the compression block for flexural strength, and the tension zone needs concrete to join with reinforcing for flexural strength. Also, the top and bottom slab faces must be linked to transmit stresses. Voided slab systems were and are still used to make long-span slab buildings lighter. Eight slab specimens of (1000*1000 mm2) were cast and tested as two-way simply supported slabs in this research. The tested specimens consist of one solid slab and seven voided slabs with the following variables (type of slab solid and voided), thickness of slab (100 and 125 mm), presence of steel fibers (0% and 1%), and the number of GFRP layers). The voids in slabs were made using high-density polystyrene of dimensions (200*200*50 mm) with a central hole of dimensions (50*50*50 mm) at the ineffective concrete zones to give a reduction in weight by (34% to 38%). The slabs were tested as simply supported slabs under partial uniform loading. The results of specimens subjected to monotonic loading show that the combined strengthening by steel fibers and GFRP sheets of the concrete specimen (V-125-2GF-1%) shows the least deflection, deflection (4.6 mm), good ultimate loading capacity (192 MPa), large stiffness at cracking and at ultimate (57 and 41.74) respectively, more ductility (1.44), and high energy absorption (1344.83; so it' s the best specimen that can be used as a voided slab under this type of loading.
Key Words
    flexural behavior; monotonic loading; SSC; two-way voided slab; weight reduction
Adel A. Al-Azzawi and Shahad H. Mtashar: Department of Civil Engineering, College of Engineering, Al-Nahrain University, Jadriya, Baghdad, Iraq

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