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A beam has dimensions of b = 18 in., h = 30 in., and d = 27.5 in. and is reinforced with 4 No. 8 bars. The concrete strength is 9,100 psi, and the yield strength of the reinforcement is 60,000 psi. Determine the strength Mn for this beam.

At a point subjected to plane stress, the stresses are σx = 20 ksi, σy = 10 ksi, and τxy = –10 ksi. Determine the angle θp corresponding to the orientation of the principal planes at the point.

Mi papá practica deporte porque quiere [q16] en forma.

Assuming Vs exceeds 4sqrt(f’c)bwd, the maximum spacing for vertical stirrups in the following beam is _____. Let b1 = 23 in., b2 = 13 in., d = 53 in., h1 = 6 in., h2 = 43 in., h3 = 9 in., and t = 8 in. There are sixNo. 8 longitudinal tension bars and No. 4 stirrups at 10 in. o.c.

Assuming Vs does not exceed 4sqrt(f’c)bwd, the maximum spacing for vertical stirrups in the following beam is _____. Let b1 = 31 in., b2 = 15 in., d1 = 4 in., and d2 = 53 in. There are three No. 7 longitudinal tension bars and No. 5 stirrups at 10 in. o.c.

If φVc = 77 kip and Vu = 37 kip, are stirrups required?

Compute φVn for the cross section shown. Assume f’c = 6,000 psi, fyt = 60,000 psi, b1 = 31 in., b2 = 10 in., d1 = 5 in., d2 = 15 in., and that there are three No. 9 longitudinal tension bars and No. 3 stirrups at 7 in. o.c.

If the beam is supported by a girder of the same _______, the compression fans that form in the supported beam will tend to push the bottom off the supporting beam.

Compute φVn for the cross section shown. Assume f’c = 3,000 psi, fyt = 40,000 psi, d = 29 in., w = 19.5 in., t = 6 in., and that there are four No. 8 longitudinal tension bars and No. 5 stirrups at 6 in. o.c.

A classmate has suggested a beam design that has dimensions of b = 12 in., h = 30 in., and d = 27.5 in. and is reinforced with 4 No. 11 bars. Assuming a cover of 1.5 in. and a stirrup diameter of 0.5 in., does the reinforcement fit within a single row as suggested?