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o_07_shr_f_st_sd - 1.054/1.541 Mechanics and Design of...

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1.054/1.541 Mechanics and Design of Concrete Structures Spring 2004 Prof. Oral Buyukozturk 1 / 8 d Massachusetts Institute of Technology 1.054/1.541 Mechanics and Design of Concrete Structures (3-0-9) Outline 7 Shear Failures, Shear Transfer, and Shear Design Structural behavior o Structural members are subjected to shear forces, generally, in combination with flexure, axial force, and sometimes with torsion. o Shear 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 o Diagonal tension failure – sudden o Shear-compression failure – gradual o Shear-bond failure Æ In general, the design for shear is based on consideration of diagonal (inclined) tension failure. Failure of R/C by inclined cracking o Inclined cracking load c cc ci V V V V = + + where V = shear transferred through the uncracked portion of the concrete, cc
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