FIRE RESISTANCE OF +-SHAPED COLUMNS SUBJECTED TO DIFFERENT FIRE EXPOSURE CASES
The fire resistance of the reinforced concrete (RC) columns with +-shaped cross section is lower than that of the RC columns with rectangular cross section for the former have thinner sectional thickness and larger surface area exposed to fire. Utilizing the fire-response analysis method for RC columns subjected to the ISO834 standard fire, the influence of main parameters on the fire resistance of such columns is primarily studied. Six kinds of parameters (i.e., axial load ratio, effective length,dimensions of cross section, load eccentricity ratio, reinforcement ratio, and load angle) are considered. 10368 columns with different values of the above parameters and with three typical fire exposure cases are selected for fire response analyses. Based on the simulation results, a practical calculation method is proposed for the fire resistance of the columns with +-shaped cross section subjected to the three typical fire exposure cases. The simulation results show that: (a) reducing the axial load ratio or effective length is an effective measure to improve the fire resistance of the columns with +-shaped cross section subjected to the three typical fire exposure cases; (b) the fire resistance of the columns with +-shaped cross section subjected to the three typical fire expose cases increases linearly with the increasing of sectional thickness for the same ratio of sectional height to sectional thickness.
Column Concrete Fire resistance Practical calculation method Fire exposure cases
Yu-Ye Xu Quan-Feng Wang Yi Luo Ting-Yi Xue
College of Civil Engineenng, Huaqiao University, Quanzhou 362021, P.R. China
国际会议
第十届国际结构工程青年学者研讨会(The Tenth International Symposium on Structural Engineering for Young Experts)
长沙
英文
1875-1880
2008-10-19（万方平台首次上网日期，不代表论文的发表时间）