Issue 67

H. Mostafa et alii, Frattura ed Integrità Strutturale, 67 (2024) 240-258; DOI: 10.3221/IGF-ESIS.67.18

electrical strain gauges with a 10 mm length and 120 Ω resistance were recorded to determine the strains in the concrete top surface (compression side), the flexural reinforcement, and the GFRP gratings. Fig. 9 showed the arrangement of strain gauges for all specimens.

Figure 8: Test setup.

Figure 9: Arrangement of strain gauges for all specimens

A NALYSIS OF THE EXPERIMENTAL RESULTS

The first crack load and crack patterns ig. 10 shows the typical crack patterns for the tested slabs. In general, the crack patterns of all specimens subjected to concentric loading were symmetric about both specimen axes. For specimen SP01 without GFRP gratings, perpendicular cracks started to appear at the column face at a load level of 100.0 kN. Small radial and tangential cracks appeared towards the column corners at a load level of 120.0 kN. A few radial cracks appeared as the load increased, F

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