- Author
-
Oksanen, T.
|
Ala-Outinen, T.
- Title
- Determination of Fire Resistance of Concrete Filled Hollow Steel Sections.
- Coporate
- VTT-Technical Research Center of Finland, Espoo
- Report
-
VTT Research Notes 1287; Project PAL8005
October 1991
56 p.
- Keywords
-
concretes
|
steels
|
fire protection
|
construction
|
temperature
|
columns
- Identifiers
- fire resistance; composite structures; steel construction; load-carrying cpacity; columns (supports)
- Abstract
- By combining steel and concrete in one structural component, the advantages of each material can be better exploited. The aim of this research project was to find a method of analyzing the behavior of centrally loaded concrete-filled hollow section columns in a fire situation. The column sections were restricted to square tubes with or without reinforcement. The analysis work can be divided in two parts: the determination of the temperature field of a section and the calculation of a failure load. The temperatures of the section were calculated by the TASEF computer program, which is based on the finite element method. The load-bearing capacity was calculated by a simplified calculation method (summation method.) On the basis of this study the following three general conclusions concerning centrally compressed composite hollow sections in fire can be drawn: 1. The scatter in the results is too high to develop accurate and reliable general calculation methods. 2. The results are on the safe side for reinforced composite hollow sections when the calculation method of this study is used. 3. If the calculation method of this study is used for unreinforced composite hollow sectons, the load-bearing capacity must be multiplied by a factor of about 0.65. It should be remembered that for practical applications the flexural capacity of unreinforced composite hollow sections in fire is close to zero.