A concrete floor system with a ratio of the longer to the shorter span length that is greater than or equal to 2 is usually considered a one-way system.

A classmate has suggested a beam design that has dimensions of b = 16 in., h = 22 in., and d = 19.5 in. and is reinforced with 4 No. 7 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?

If φVc = 24 kip and Vu = 33 kip, are stirrups required?

If φVc = 24 kip and Vu = 33 kip, are stirrups required?

Stirrups are unable to resist shear unless they are crossed by an inclined crack.

Stirrups are unable to resist shear unless they are crossed by an inclined crack.

Smaller diameter aggregate creates a rougher crack surface, allowing higher shear stresses to be transferred across cracks.

If φVc = 44 kip and Vu = 39 kip, are stirrups required?

Compute φVn for the cross section shown. Assume f’c = 5,000 psi, fyt = 60,000 psi, b1 = 31 in., b2 = 13 in., d1 = 8 in., d2 = 15 in., and that there are three No. 6 longitudinal tension bars and No. 5 stirrups at 9 in. o.c.

Shear stresses will exist in those parts of a beam where the moment is constant from section to section.