The ACI Code defines 0.02 as the maximum usable compressive strain for reinforced concrete.

A beam is singly reinforced with the reinforcement in two rows. The bottom row contains 10 No. 8 bars at a depth of 16 in. The top row contains 8 No. 6 bars at a depth of 11 in. Determine the effective (centroidal) depth, d, of the steel.

Reinforcement within concrete will not rust until an electrolytic cell can be established.

Rust occupies two to three times the volume of the metal from which it is formed.

When a section cracks, its moment of inertia decreases, leading to a decrease in the stiffness of the beam.

At a point subjected to plane stress, the stresses are σx = –60 MPa, σy = –40 MPa, and τxy = 100 MPa. Determine the angle θp corresponding to the orientation of the principal planes at the point.

A beam is singly reinforced with the reinforcement in two rows. The bottom row contains 7 No. 7 bars at a depth of 20 in. The top row contains 3 No. 6 bars at a depth of 16 in. Determine the effective (centroidal) depth, d, of the steel.

Vertical stirrups are preferable over inclined stirrups when _______.

Use the interaction diagrams found in Appendix A of the textbook to determine whether the following rectangular tied column with bars in 4 faces can safely support a load of Pu = 780 kip and Mu = 608.4 kip-ft.b = 12 in.h = 26 in.fc’ = 4 ksify = 60 ksiγ = 0.75ρg = 0.04

Cracks in a member lower the member’s moment of inertia, thereby decreasing the member’s stiffness.