型钢混凝土L形柱耐火性能模拟研究

SIMULATION STUDY ON FIRE RESISTANCE OF STEEL REINFORCED CONCRETE L-SHAPED COLUMN

利用有限元软件ABAQUS对型钢混凝土L形柱的耐火性能进行了模拟研究,并验证相关试验结果一致性。此外,考虑轴压比、偏心距、计算长度和受火方式的影响,研究了在ISO-834《建筑构件耐火试验方法 GB/T 9978.1—2008》标准升温曲线下型钢混凝土L形柱的耐火性能。结果表明:耐火极限随轴压比、偏心距、计算长度和受火面数量的增加而减小;轴压比从0.6增加至0.8,耐火极限下降幅度由13.3%降低为44.6%;偏心距从25 mm增加至75 mm,耐火极限下降幅度为9.3%~31.0%;计算长度从1 000 mm增加至2 000 mm,耐火极限下降幅度为5.2%~17.5%;受火面数量从单面增加至四面受火,耐火极限降低了27.6%。

The finite element software ABAQUS was used to simulate the fire resistance of steel reinforced concrete(SRC)L-shaped columns,and the consistency was verified with the relevant test results.In addition,the influence of axial load ratio,eccentricity,calculated length and fire mode was considered,and the fire resistance of SRC L-shaped columns under ISO-834 Fire-resistance tests elements of building construction standard heating curve was studied.The results demonstrated as following.The fire resistance decreased with the increase of axial load ratio,eccentricity,calculated length and the number of fire surfaces.As the axial load ratio increased from 0.6 to 0.8,the fire resistance decreased by 13.3%to 44.6%.As the eccentricity increased from 25 mm to 75 mm,the fire resistance decreased by 9.3%to 31.0%.As the calculated length increased from 1000 mm to 2000 mm,the fire resistance decreased by 5.2%to 17.5%.The fire resistance decreased by 27.6%when the number of fire surfaces increased from singleface fire to four-face fire.