中心圧縮を受ける充填鋼管コンクリート柱の内部温度と耐火時間に関する研究

概要

論文の詳細を見る
This paper presents both experimentally and analytically the fire-resistance of concrete-filled steel tube (CFT) columns without fire-protection. Six of CFT column specimens, with rectangular or circular sections of 300mm to 500mm in size, were heated for three hours in accordance with ISO-834. A transition of the temperatures measured inside of concrete was simulated successfully by the numerical thermal analysis, in which the thermal conductivity of concrete was taken as 0.8 times of the value prescribed in Eurocode 4 (EC4), and the specific heat of concrete taken as 1.2 times. Based on the numerical thermal analysis for the CFT columns, a non-linear stress analysis was carried out taking into account the under-high-temperature behaviors of concrete as prescribed in EC4. It turned out that, for the heating tests of the axially loaded CFT columns, the stress analysis could possibly explain the deviation in the previous experimental data by allowing a tolerance to the standard heating curves prescribed in ISO-834.
社団法人日本建築学会の論文
2004-08-30