A simply supported rectangular beam with a length of span of 20 ft carries its self-weight, an additional dead load of 1.5 kips/ft, and a live load of 2.0 kips/ft. The beam has a width of 12 in., height of 18 in., clear cover for the longitudinal reinforcement of 1.5 in., and it is constructed with concrete with compressive strength of 3,000 psi and four No. 6 Grade 60 steel bars on the tension side. Design the shear reinforcement in the beam for the: unreduced shear demand and uniform spacing for the transverse reinforcement, reduced shear demand and uniform spacing for the transverse reinforcement, reduced shear demand and non-uniform spacing for the transverse reinforcement, unreduced shear demand and non-uniform spacing for the transverse reinforcement. Compare the amount of ties needed in each case and comment on the results. Redesign the beam of Problem 2 for the first three cases assuming concrete with compressive strength of 6 ksi is available. What do you observe? Redesign the beam of Problem 2 for the first three cases assuming Grade 120 reinforcing bars will be used for the ties. What do you observe? A simply supported rectangular beam with a length of span of 20 ft carries its self-weight, an additional dead load of 1.5 kips/ft, and a live load of 2.0 kips/ft. The beam has a width of 12 in., height of 18 in., clear cover for the longitudinal reinforcement of 1.5 in., and it is constructed with concrete with compressive strength of 3,000 psi and four No. 6 Grade 60 steel bars on the tension side. Design the shear reinforcement in the beam for the: unreduced shear demand and uniform spacing for the transverse reinforcement, reduced shear demand and uniform spacing for the transverse reinforcement, reduced shear demand and non-uniform spacing for the transverse reinforcement, unreduced shear demand and non-uniform spacing for the transverse reinforcement. Compare the amount of ties needed in each case and comment on the results. Redesign the beam of Problem 2 for the first three cases assuming concrete with compressive strength of 6 ksi is available. What do you observe? Redesign the beam of Problem 2 for the first three cases assuming Grade 120 reinforcing bars will be used for the ties. What do you observe