A wall footing has the following conditions. Determine the moment capacity, Mn, of the footing. Assume the footing is 5 ft wide, the pressure that acts on the bottom of the footing is 5,360 psf, and the reinforcement is a #4 bar spaced every 12 inches.The bottom of the footing is at a depth of 4 ft below grade.The service dead load is 13 kips/ft, and the service live load is 7 kips/ft.The wall is 14 in. thick.The footing is 16 in. thick.The allowable soil pressure, qa, is 5,000 psf.The soil has a density of 125 lb/ft3.The concrete has a density of 150 lb/ft3.The concrete cover has a thickness of 3 in.f’c = 3,500 psi and fy = 60,000 psi.

Determine the maximum axial strength φPn,max for the following circular spiral column.Column diameter, h = 26 in.Number of longitudinal bars = 8Size of longitudinal bars = No. 10Size of spirals = No. 4Concrete strength = 6,000 psiYield strength of longitudinal bars = 60,000 psiYield strength of spirals = 60,000 psi

A wall footing has the following conditions. Determine the minimum width of the footing.The bottom of the footing is at a depth of 4 ft below grade.The service dead load is 6 kips/ft, and the service live load is 8 kips/ft.The wall is 16 in. thick.The footing is 15 in. thick.The allowable soil pressure, qa, is 4,000 psf.The soil has a density of 120 lb/ft3.The concrete has a density of 150 lb/ft3.The concrete cover has a thickness of 3 in.f’c = 4,000 psi and fy = 60,000 psi.

Because of their _______ ductility, compression-controlled spiral columns are assigned a _______ strength-reduction factor than tied columns.

A wall footing has the following conditions. Determine the shear capacity, φVn, of the footing. Assume the footing is 5 ft wide, the pressure that acts on the bottom of the footing is 5,440 psf, and the reinforcement is a #5 bar spaced every 12 inches.The bottom of the footing is at a depth of 3 ft below grade.The service dead load is 12 kips/ft, and the service live load is 8 kips/ft.The wall is 12 in. thick.The footing is 12 in. thick.The allowable soil pressure, qa, is 5,200 psf.The soil has a density of 130 lb/ft3.The concrete has a density of 150 lb/ft3.The concrete cover has a thickness of 3 in.f’c = 3,000 psi and fy = 60,000 psi.

A wall footing has the following conditions. Determine the required cross-sectional area of shrinkage and temperature reinforcement. Assume the footing is 4 ft wide, the pressure that acts on the bottom of the footing is 6,500 psf, and the reinforcement is a #4 bar spaced every 12 inches.The bottom of the footing is at a depth of 4 ft below grade.The service dead load is 11 kips/ft, and the service live load is 8 kips/ft.The wall is 14 in. thick.The footing is 13 in. thick.The allowable soil pressure, qa, is 5,700 psf.The soil has a density of 130 lb/ft3.The concrete has a density of 150 lb/ft3.The concrete cover has a thickness of 3 in.f’c = 3,500 psi and fy = 60,000 psi.

A wall footing has the following conditions. Determine the required development length, ld, for the reinforcement. Assume the footing is 3 ft wide, the pressure that acts on the bottom of the footing is 6,133 psf, and the reinforcement is a #4 bar spaced every 12 inches.The bottom of the footing is at a depth of 2 ft below grade.The service dead load is 6 kips/ft, and the service live load is 7 kips/ft.The wall is 10 in. thick.The footing is 16 in. thick.The allowable soil pressure, qa, is 5,200 psf.The soil has a density of 110 lb/ft3.The concrete has a density of 150 lb/ft3.The concrete cover has a thickness of 3 in.f’c = 3,900 psi and fy = 60,000 psi.

In tall buildings, the concrete strength in the columns is often _______ than in the floors because _______.

A wall footing has the following conditions. Determine the critical one-way shear, Vu, at a distance of d from the face of the wall. Assume the footing is 4 ft wide, the pressure that acts on the bottom of the footing is 5,700 psf, and the reinforcement is a #5 bar spaced every 12 inches.The bottom of the footing is at a depth of 3 ft below grade.The service dead load is 11 kips/ft, and the service live load is 6 kips/ft.The wall is 10 in. thick.The footing is 12 in. thick.The allowable soil pressure, qa, is 4,700 psf.The soil has a density of 110 lb/ft3.The concrete has a density of 150 lb/ft3.The concrete cover has a thickness of 3 in.f’c = 3,600 psi and fy = 60,000 psi.

A wall footing has the following conditions. Determine the distance to the neutral axis, c, measured from the top of the footing. Assume the footing is 6 ft wide, the pressure that acts on the bottom of the footing is 4,666 psf, and the reinforcement is a #8 bar spaced every 12 inches.The bottom of the footing is at a depth of 4 ft below grade.The service dead load is 14 kips/ft, and the service live load is 7 kips/ft.The wall is 16 in. thick.The footing is 15 in. thick.The allowable soil pressure, qa, is 4,600 psf.The soil has a density of 130 lb/ft3.The concrete has a density of 150 lb/ft3.The concrete cover has a thickness of 3 in.f’c = 3,500 psi and fy = 60,000 psi.