The reinforced concrete beam which has width 25 cm, lever arm 40 cm, shear force 6 t/cm2, safe shear stress 5 kg/cm2 and B.M. 24 mt,

A. Is safe in shear

B. Is unsafe in shear

C. Is over safe in shear

D. Needs redesigning

Answer: Option B

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Comments ( 1 )

  1. Bonjamo Kithan
    Bonjamo Kithan :
    3 years ago

    Acc to IS 456:1978
    Max shear stress (q max)
    Q max= shear force/lever arm*width
    = 6000/40*25 = 6kg/cm2
    So shear stress(6)>safe shear stress(5)
    So ans B is correct. Unsafe in shear

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If the shear stress in a R.C.C. beam is

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C. Greater than 20 kg/cm2, the size of the section is changed

D. All the above