A sample of Grade 60 (metric Grade 420) deformed reinforcing steel bar is subjected to a standard tension test (ASTM A370). The bar is a No. 6 size, which corresponds to a nominal diameter of 0.75 inches ($19.05$ mm).

During the test, the following data is recorded: Initial gauge length ($L_0$) = 200.00 mm Load at the distinct yield point ($P_y$) = 125.0 kN Maximum load before fracture ($P_{ult}$) = 190.5 kN Final gauge length after fracture ($L_f$) = 236.00 mm

Calculate the nominal cross-sectional area, yield strength ($f_y$), ultimate tensile strength ($f_u$), and the percentage of elongation at fracture. Determine if this bar meets the ASTM A615 specifications for Grade 420 steel ($f_y \ge 420$ MPa, $f_u \ge 620$ MPa, Minimum Elongation = 9%).

A No. 8 (25 mm diameter) Grade 60 ($f_y = 420$ MPa) deformed rebar is cast into normal-weight concrete with a compressive strength ($f'_c$) of 28 MPa.

Calculate the basic development length in tension ($l_{dt}$) using the simplified ACI 318 equation for bars smaller than No. 7 or equal/larger than No. 7, assuming standard clear spacing and cover (Equation factors $\psi_t = 1.0$, $\psi_e = 1.0$, $\psi_s = 1.0$, and $\lambda = 1.0$).

The simplified ACI equation for No. 7 and larger bars is: $l_{dt} = \left( \frac{f_y}{2.1 \lambda \sqrt{f'_c}} \right) d_b$