CEE461_HomeworkSet2_01052019.pdf - CEE461 – Reinforced...

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CEE461 – Reinforced Concrete I University of Illinois at Urbana-Champaign Gurfinkel and Asem Spring 2019 Name:____________________________ © 2019 1 Homework Set 2 Follow Homework Assignment requirements in the Syllabus. Due date: Thursday, January 31, 2019 Nominal bending strength and curvature For the given reinforced concrete (RC) flanged section, do the following: Figure 1 Reinforced concrete flanged section subjected to positive bending (i.e., tension in the bottom). Note that t f = flange thickness, b f = flange width and b w = web width. Stirrups and compression reinforcement are not shown for clarity. h = 24 in t f = 6 in d = ? b w = 12 in b f = 24 in 5 #9 bars total, Gr. 60 (f y = 60 ksi) f ' c = 4000 psi CG 2.5 in, net cover 1 in Layer 2 Layer 1 d 2 d 1
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CEE461 – Reinforced Concrete I University of Illinois at Urbana-Champaign Gurfinkel and Asem Spring 2019 © 2019 2 Part A: Consider the RC flanged section shown in Fig. 1. Problem 1. Draw annotated strain and stress distributions at ultimate. Use Whitney’s rectangular stress block. Find c, the distance to the neutral axis from top compression fiber. Hint: assume
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