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Calculate ultimate moment and shear of effective span is 30m, live load is 9kn/m, dead load excluding self weight is 2kn/m, load factors for dead load is 1.4 for live load is 1.6 cube strength of concrete fcu is 50n/mm2 cube strength at transfer is fci is 35n/mm2, tensile strength of concrete Ec is 34kn/mm2 loss ratio ɳ is 0.85 and 8mm diameter high tensile strength fpu is 1500n/mm2 are available for use and the modulus of elasticity of high tensile wires is 200kn/mm2?

Correct Answer: 340 and 450kn
Wmin/Wud = (50x2400x9.81×0.125x25x30/50×106x0.852) = 0.31 Ultimate load excluding the factored selfweight = (1.4×2)+(1.6×9) = 17.2kn/m, Wud = 17.2/1-1.4×0.31 = 30KN/M, Wmin = (0.31×30) = 9.3kn/m, Ultimate moment, Mu = (0.125x30x302) = 3400knm, Ultimate shear, Vu = (0.5x30x30) = 450kn.

Design a pretensioned roof pull-in to suit the data Fcu, concrete cube strength = 50n/mm2, effective span = 6m, applied load = 5kn/m, dead load = 1.4, live load = 1.6, β = 0.125, k = 7.5, Dc = 2400, and determine ultimate moment and shear?

Find ratio for ultimate flexural strength at the centre – span section given that Aps = 3000mm2, d = 1150mm, fcu = 50n/mm2, bw = 150mm, fpu = 1500n/mm2, b = 600mm, ht = 250mm, design ultimate moment mud = 3400knm?

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