CE 411 – REINFORCED CONCRETE DESIGN
Fall 2020 - Prof. Li - Homework Assignment #1
Due date: Sept 3, 2020 (Thursday)
Problem 1:
Determine the maximum flexural stress produced by a moment M=15 kN-m for the beam section shown
below.
Problem 2:
The normal weight plain concrete beam shown is on a simple span of 10 ft. It carries a dead load (which
includes the weight of the beam) of 0.5 kip/ft. There is a concentrated load of 2 kips located at midspan.
Use fc' =3000 psi. Compute the maximum bending stress. Use the internal coupled method and check
with the flexural formula.
Problem 3:
The plain concrete beam shown is used on a 12-ft simple span. The concrete is normal weight with
fc'=3000psi. Assume positive moment.
a. calculate the cracking moment
b. calculate the value of the concentrated load P at midspan that would cause the concrete beam to crack.
(Be sure to include the weight of the beam)
