Steel and Composite Structures

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Experimental and numerical analysis of the punching behavior of RC isolated footings

  • Walid, Mansour (Civil Engineering Department, Faculty of Engineering, Kafrelsheikh University) ;
  • Sabry, Fayed (Civil Engineering Department, Faculty of Engineering, Kafrelsheikh University) ;
  • Ali, Basha (Civil Engineering Department, Faculty of Engineering, Kafrelsheikh University)
  • Received : 2021.05.29
  • Accepted : 2022.11.29
  • Published : 2022.12.10
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Abstract

In the current study, punching behavior of Reinforced concrete (RC) isolated footings was experimentally and numerically investigated. The experimental program consisted of four half-scale RC isolated footing specimens. The test matrix was proposed to show effect of footing area, reinforcement mesh ratio, adding internal longitudinal reinforcement bars and stirrups on the punching response of RC isolated footings. Footings area varied from 1200×1200 mm2 to 1500×1500 mm2 while the mesh reinforcement ratio was in the range from 0.36 to 0.45%. On the other hand, a 3D non-linear finite element model was constructed using ABAQUS/standard program and verified against the experimental program. The numerical results agreed well with the experimental records. The validated numerical model was used to study effect of concrete compressive strength; longitudinal reinforcement bars ratio and stirrups concentration along one or two directions on the ultimate load, deflection, stiffness and failure patterns of RC isolated footings. Results concluded that adding longitudinal reinforcement bars did not significantly affect the punching response of RC isolated footings even high steel ratios were used. On the contrary, as the stirrups ratio increased, the ultimate load of RC isolated footings increased. Footing with stirrups ratio of 1.5% had ultimate load equal to 1331 kN, 19.6% higher than the bare footing. Moreover, adding stirrups along two directions with lower ratio (0.5 and 0.7%) significantly enhanced the ultimate load of RC isolated footings compared to their counterparts with higher stirrups ratio (1.0 and 1.5%).

Keywords

Acknowledgement

The experimental tests were carried out by the reinforced concrete laboratory of the faculty of Engineering, Kafrelsheikh University, Egypt.

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