Dr Didier Talamona

1
Numerical Study of the Fire Resistance of Steel
Columns in Axial Compression and Uniform Bending

• Dr Didier Talamona
• ASCE/SEI Structures Congress '09, Austin, TX

2
Overview

• Motivation
• Comparisons
• EC3 - BCCF
• Numerical Simulations
• with experimental results
• Conclusions

3

• Motivation

4
Original formulation from EC3 (1.1 1.2)
5
Coefficients K (EC3 part 1.2)

6
Coefficients m (7 differences)
7
Sensitivity of M-N curve to m
8

• Comparison BCCF - EC3

9
Assumptions

• Reduced slenderness from 0.2 to 2.4
• 6 M/N ratios (0.05 - 5.0 x radius of Gyration)
• Major and minor axis
• Uniform bending moment distribution
• Failure temperatures from 20ºC to 860ºC
• Steel S235

10
Comparison major buckling axis
11
Major
12
Comparison minor buckling axis
13
Minor
14
(No Transcript)
15

• Numerical Simulations

16

• Full column heated

10 of the column heated
17
(No Transcript)
18
(No Transcript)
19
Uniform Temperature - Strong
20
Uniform Temperature - Weak
21
Longitudinal Gradient - Strong
22
Longitudinal Gradient - Weak
23

• Comparison with
• experimental results

24
Comparison with 64 experimental results
25

• Conclusions

26
Conclusions

• Similar failure temperatures
• Eurocode is more conservative/safer than BCCF
• Almost no difference above 550ºC
• Both formulations predict experimental results
• Improved M-N formulae should be proposed
  (including thermal gradient)

27

• Thank you

28
(No Transcript)
29
(No Transcript)
30
(No Transcript)
31
(No Transcript)
32
(No Transcript)