{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Assignment_8_SOLUTION_due_11_5_09

# Assignment_8_SOLUTION_due_11_5_09 - Name_SOLUTION CE 441...

This preview shows pages 1–2. Sign up to view the full content.

Name: _ _SOLUTION _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ CE 441 Reinforced Concrete Design – Assignment 8 Due Thursday November 5, 2009 Notes: The modulus of elasticity of normal weight concrete is given by E c =57,000 ' c f (psi) according to ACI 8.5.1. The modulus of rupture f r =7.5 ' c f (psi) as specified by ACI 9.5.2.3. The effective moment of inertia of a beam is given by ACI 9.5.2.3 as cr a cr g a cr e I M M I M M I - + = 3 3 1 . The cracking moment is M cr = f r I g / y t where y t is the distance from centroid of the gross section to the location of maximum tension in concrete. The center deflection of a simply supported beam of span length L under uniformly distributed load w is Δ max =5 wL 4 /(384 EI ). 1. A concrete beam is used for a 25-ft simple span. It has a rectangular section of width b =15 in. and has only tension reinforcement with an effective depth d =20 in., total depth h =23 in., f c '=3,500 psi, f y =60,000 psi, A s =3 no. 10 bars in one row. Determine the location of the neutral axis kd for the cracked section (stresses linear). Calculate the gross section moment of inertia I g , the cracking moment M cr . Compute the cracked

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern