Structural Concrete - Hassoun

Problems 289
Figure 7.17
(33 kN/m).
Problem 7.14: Dead load = 1.5 K/ft (22.5 kN/m), live load = 2.2 K/ft
7.15 DesignthebeamshowninFig.7.18usingasteelratioρ = 1 ρ 2 b . Draw the moment–resistance diagram
and indicate the cutoff points. Use f c ′ = 3ksi, f y = 60 ksi, and b = 12 in.
Figure 7.18 Problem 7.15: Dead load = 2 K/ft (30 kN/m), live load (concentrated
loads only) is P 1
= 10 K (45 kN), P 2
= 16 K (72 kN).
7.16 Design the section at support B of the beam shown in Fig. 7.19, ρ max . Adopting the same dimensions of
the section at B for the entire beam ABC, determine the reinforcement required for part AB and draw the
moment–resistance diagram for the beam ABC.Usef c ′ = 4ksi, f y = 60 ksi, and b = 12 in.
Figure 7.19
Problem 7.16: Dead load = 6 K/ft (90 kN/m), live load = 4 K/ft (60 kN/m).