1.054/1.541 Mechanics and Design of Concrete Structures Spring 2004Prof. Oral Buyukozturk 1 / 8dMassachusetts Institute of Technology1.054/1.541 Mechanics and Design of Concrete Structures (3-0-9) Outline 7 Shear Failures, Shear Transfer, and Shear DesignStructural behavior oStructural members are subjected to shear forces, generally, in combination with flexure, axial force, and sometimes with torsion. oShear failures are brittle failures primarily because shear resistance in R/C relies on tensile as well as the compressive strength of concrete. Although cracking introduces complications it is still convenient to use classical concepts in analyzing concrete beams under shear failure. Such concepts indicate that shear failure is related to diagonal tensile behavior in concrete. R/C beam must be safe against premature failure due to diagonal tension. Failure modes due to shear in beams oDiagonal tension failure – sudden oShear-compression failure – gradual oShear-bond failure ÆIn general, the design for shear is based on consideration of diagonal (inclined) tension failure. Failure of R/C by inclined cracking oInclined cracking load cccciVVVV=++where V= shear transferred through the uncracked portion of the concrete, cc
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