A rectangular beam has a cross section of b = 14 in., h = 22 in., and d = 19.5 in. It is reinforced with three No. 8 Grade 60 bars. The concrete strength is 6,700 psi (normal weight). The beam has Grade 60 No. 3 stirrups. Determine the gross moment of inertia, Ig, for the beam.

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Determine the transverse reinforcement index, Ktr, for a rectangular beam with b = 16 in. and d = 22 in., four epoxy-coated No. 9 Grade 60 tension-reinforcement bars placed in the bottom of the beam, and No. 4 Grade 60 stirrups located every 12 in. along the span. Assume 7,000-psi lightweight concrete and a clear cover of 1.75 in.

net cell voltage = (reduction potential reaction at cathode) – (reduction potential reaction at anode) Q = I x t = n x F mass = moles x molar mass F = 96485 C/mol e- surface area = length x width volume = length x width x depth density = mass/volume      Balance the two reactions below.  Reaction a) is in an acidic solution, Reaction b) is in a basic solution. a) N2H4 + Cu(OH)2 –> N2 + Cu   b) Cr2O72- + I2 –> Cr3+ + IO3-    

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A rectangular beam has a cross section of b = 18 in., h = 28 in., and d = 25.5 in. It is reinforced with two No. 7 Grade 60 bars. The concrete strength is 9,400 psi (normal weight). The beam has Grade 60 No. 3 stirrups. Determine the gross moment of inertia, Ig, for the beam.