This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Name: SOLUTION Thursday September 3, 2009 CE441 Workshop 1 on Ultimate Strength Design of Beams with Tension Steel Due at the end of class A rectangular beam made using concrete with compressive strength f c '= 5,000 psi and steel reinforcing bars with yield strength f y = 60,000 psi has width b= 12 in, total depth h= 23 in., and effective depth d= 20 in as shown in the figure. The tensile steel area is A s = three No. 11 bars (See ACI 31808 Appendix E, page 439 for bar areas). 1. Compute the balanced reinforcement ratio ρ b and the actual steel reinforcement ratio ρ . Are the requirements of ACI 31808 section 10.5.1 (discussed in Lecture 3 on 912009 and also by Wight and MacGregor on page 113) regarding minimum reinforcement satisfied if the section is to be used as a simply supported beam? 2. Calculate the depth a of the equivalent rectangular stress block (see class notes from 9/1/09 and ACI 31808 section 10.2.7 or Wight and MacGregor page 120) at the time of failure. Also compute the nominal flexural strength 10....
View
Full
Document
This document was uploaded on 03/03/2010.
 Spring '09

Click to edit the document details