INVESTIGATION OF PRE-AND POSTCRACKING SHEAR BEHAVIOR OF PRESTRESSED CONCRETE BEAMS USING INNOVATIVE MEASURING TECHNIQUES

At present, no unified theory exists that is capable of fully describing the complex behavior of reinforced concrete (RC) elements subjected to shear, with recent research results tending to contradict each other. Using innovative measuring techniques, the pre-and postcracking shear behavior of concrete beams was studied giving insight to the shear resistance mechanism of RC beams. Laser interferometry was used to study the precracking behavior. It is shown that nonlinear stress distributions occur before the formation of visible cracks, thereby influencing the cracking angle. Photogrammetry was applied to study postcracking behavior. The measured displacement components of the crack edges were used to estimate the shear transferred across the cracks by shear friction. It is shown in this paper that for beams with low or high shear reinforcement ratios, the amount of shear force transferred across cracks by shear friction is negligible.

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  • English

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  • Accession Number: 00971263
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 7 2004 12:00AM