Explain the behavior of rc beam (load-deflection or Moment-curvature) under the flexural loading highlighting different stages of...

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Civil Engineering

Explain the behavior of rc beam (load-deflection orMoment-curvature) under the flexural loading highlighting differentstages of loading till failure; i.e. un-cracked section, crackedsection, service condition, yielding and ultimate loadingcondition.

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Uncracked Concrete StageAt small loads when the tensile stresses are less than themodulus of rupture the bending tensile stress at which theconcrete begins to crack the entire cross section of the beamresists bending with compression on one side and tension on theother as shown in Figure below According to ACI 31811 code themodulus of rupture is062Where 1 for normal concrete085 For sand light weight concrete075 For all light weight concreteConcrete CrackedElastic Stresses StageAs the load is increased after the modulus of rupture of theconcrete is exceeded cracks begin to develop in the bottom of thebeam The moment at which these cracks begin toformthat is when the tensile stress in the bottom of the beamequals the modulus of ruptureis See Answer

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