1. CE 891-605: Structural fire Engineering
SAFIR- Computer Program
Two Case Studies
Dept. of Civil and Env. Enginerring
Michigan State University

2. Problem 1 Thermal Analysis of reinforced concrete beam.
Problem Definition
Reinforced concrete beam
Symmetric about the Y-axis
ISO standard fire from three sides
Steel ratio = 1%
Concrete cover = 30 mm
400 mm
300 mm

3. Input File Geometrical data and discretizing
Using the symmetry about the vertical axis, half the section is discritized as shown.
162 nodes (9X18)
136 elements (8X17)
400 mm
150 mm

4. Input File Material Properties and boundary conditions
Two materials were used, steel and concrete
The black area represents the steel reinforcement which is assumed to be uniformly distributed
The fire side is denoted by ‘1’

5. Input File Time of exposure and time increment
Time of exposure = 3600 sec ( 1 hour)
Time increment = 20 sec
Printed time increment = 60 sec

6. Obtained results
Temperature distribution after 30 min of exposure

7. Obtained Results
Temperature distribution after 30 min of exposure to user fire

8. Problem 2 Structural Analysis of the Reinforced concrete beam
Problem Definition
Simply supported beam.
Thermal analysis is performed in problem 1.
fy = 500 MPa
f’c = 25 MPa
40 kN/m
4 m

9. Input File Geometrical data and discretizing 21 nodes
10 elements (3 nodes per element)

10. Input File Material Properties and boundary conditions
Two materials were used, steel and concrete.
Simply supported beam.
Distributed load of 20 kN/m (half the total loading due to symmetry)

11. Input File Time of exposure and time increment
Time of exposure = 3600 sec ( 1 hour)
Time increment = 5 sec
Printed time increment = 5 sec

12. Obtained Results