Numerical modelling of behaviour of reinforced concrete columns in fire and comparison with Eurocode 2
- 作者：Sebastjan Bratina ; Bojan Č ; as ; Miran Saje and Igor Planinc
- 关键词：Fire resistance ; Finite element method ; Reinforced concrete column ; Thermal strain ; Creep strain ; Transient strain ; Eurocode 2
- 刊名：International Journal of Solids and Structures
- 出版年：2005
- 期刊代码：93_00207683
- 类别：et
- 出版时间：2005
- 卷：42
- 期：21-22
- 页码：5715-5733
- 文件大小：1311 K
摘要
The paper describes a two-step finite element formulation for the thermo-mechanical non-linear analysis of the behaviour of the reinforced concrete columns in fire. In the first step, the distributions of the temperature over the cross-section during fire are determined. In the next step, the mechanical analysis is made in which these distributions are used as the temperature loads. The analysis employs our new strain-based planar geometrically exact and materially non-linear beam finite elements to model the column. The results are compared with the measurements of the full-scale test on columns in fire and with the results of the European building code EC 2. The resistance times of the present method and the test were close. It is also noted that the building code EC 2 might be non-conservative in the estimation of the resistance time.