轴向约束钢筋混凝土异形柱的高温试验研究  

Experimental study on axially restrained reinforced concrete columns with special shaped cross sections under fire

作　　者：吴波[1] 陈书良[1] 张海燕[1] 

机构地区：[1]华南理工大学亚热带建筑科学国家重点实验室,广东广州510640

出　　处：《土木工程学报》2009年第8期67-74,共8页China Civil Engineering Journal

基　　金：国家自然科学基金(50478078;50738005);国家科技支撑计划子课题(2006BAJ03A03-12);教育部新世纪优秀人才支持计划(NCET-04-0819)

摘　　要：开展4根T形和4根十字形钢筋混凝土柱在IS0834标准升温过程下的明火试验，考察轴向约束刚度比和轴压比对高温下异形柱破坏形态、轴向变形、附加轴力等的影响趋势。试验结果表明：①高温下因轴向约束产生的最大附加轴力大致相当于各试件常温轴力的19％～62％。②随轴压比减小，最大附加轴力逐渐增加，轴向约束刚度比较大时该趋势更为明显。③随轴向约束刚度比的增大，最大附加轴力逐渐增加，轴压比较小时该趋势更为明显。④在试验所涉及的轴压比和轴向约束刚度比范围内，前者对最大附加轴力的影响总体上更为显著。由于火灾中相邻构件之间相互约束作用的客观存在，积极开展约束构件的抗火研究对科学把握其真实火灾行为是必要的。Experimental study on four ＇T＇-shaped reinforced concrete （RC） columns and four ＇ ＋＇-shaped RC columns were conducted the effects of axial restraint ratio and axial load ratio on column axial deformation and additional axial force in column were investigated. Test results shown that： （a） the maximum additional axial force due to the axial restraint is about 19% -62% of the column axial force at room temperature; （b） the maximum additional axial force increases with the reduction in axial load ratio, and this trend become significant while the axial restraint ratio become large; （c） the maximum additional axial force increases with an increase in the axial restraint ratio, and this trend is more significant while the axial load ratio is less; and （d） within the scopes of the axial load ratio and axial restraint ratio considered in this study, the influence of the axial load ratio on the maximum additional axial force is more significant on the whole. Since the restraint actions exist between adjacent structural members in practical engineering structures, studying the performance of the restrained structural members under fire is critical for the understanding of the real performance of structures exposed in fire.

关 键 词：钢筋混凝土 异形柱 高温 轴向约束 

分 类 号：TU375.3[建筑科学—结构工程]