Solution to Homework Set #2
ENCE 454 – Design of Concrete Structures – SPRING 2004
Assigned T, 2/17
Due T, 2/24
Problem 1:
Calculate the cracking moment (resisting moment) for the T-shaped unreinforced
concrete beam shown in the figure. Use f c′ = 4000 psi. Assume positive moment
(compression in the top). Use the internal couple method and check using the flexure
formula.
f top
20′′
4′′
+
6.67′′
4.67′′
20′′
N.A.
5.33′′
+
15.33′′
f bott
5′′
*** SOLUTION ***
Next Page
HW #2, ENCE 454 – Spring 2004
1/9
© Assakkaf
HW #2, ENCE 454 – Spring 2004
2/9
© Assakkaf
HW #2, ENCE 454 – Spring 2004
3/9
© Assakkaf
Problem 2:
Textbook: 5.1 (part b only)
HW #2, ENCE 454 – Spring 2004
4/9
© Assakkaf
Problem 3:
Textbook: 5.2 (part a only)
HW #2, ENCE 454 – Spring 2004
5/9
© Assakkaf
Problem 4:
Textbook: 5.4
HW #2, ENCE 454 – Spring 2004
6/9
© Assakkaf
HW #2, ENCE 454 – Spring 2004
7/9
© Assakkaf
Problem 5:
Textbook: 5.5 (the beam of part b only)
HW #2, ENCE 454 – Spring 2004
8/9
© Assakkaf
HW #2, ENCE 454 – Spring 2004
9/9
© Assakkaf