有侧移钢筋混凝土方柱的耐火极限分析  

Analysis of Fire Endurance of Reinforced Concrete Columns with Sideway

作　　者：吴波[1] 陈海巨 WU Bo;CHEN Haiju(State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China)

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：《防灾减灾工程学报》2017年第5期848-854,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家十三五重点研发计划课题(2016YFC0701203);国家自然科学基金项目(51378225)资助

摘　　要：采用结构抗火分析软件SAFIR,对独立柱与框架柱的耐火极限进行了比较,并对有侧移柱的计算模型进行了验证;针对不同的侧移因子、截面尺寸、荷载比和配筋率共240种工况,开展了有侧移方柱的耐火分析,揭示了各参数对柱耐火极限折减系数的影响规律;在此基础上,建立了有侧移方柱耐火极限的实用计算公式。研究表明:(1)柱端水平侧移较大时,框架柱的耐火极限相比独立柱明显降低;(2)随着侧移因子的增加,耐火极限折减系数逐渐减小,特别是当柱截面尺寸较大时影响更为显著;(3)随着柱截面尺寸的增加,耐火极限折减系数逐渐降低,且侧移因子越大降低速率越快;(4)随着荷载比的增加,耐火极限折减系数总体上逐渐减小,但配筋率对耐火极限折减系数的影响相对较弱。By using the computer program SAFIR for analysis of reinforced concrete structures in fire,a comparison between the fire endurance of frame columns and that of independent column has been conducted,and the numerical model of the column with sideway is verified.Then,the influences of lateral-displacement factor,sectional dimensions of column,axial load ratio,and reinforcement ratio on the fire resistance reduction coefficient（FRRC）of square column with sideway have been numerically studied,and a regressive formula is proposed to determine the FRRC.It is found that：（a）when the column＇s sideway is large,the fire endurance of frame column is remarkable lower than that of independent column;（b）with the increasing of the lateral-displacement factor,the FRRC decreases gradually,especially when the sectional dimensions of the column is bigger,the effect of the lateral-displacement factor is more significant;（c）the FRRC reduces gradually with the increasing of the sectional dimensions of the column,and the greater the lateral-displacement factor,the faster the rate of reduction of the FRRC;and（d）with the increasing of the axial load ratio,the FRRC decreases gradually on the whole,but the effect of the reinforcement ratio on the FRRC is relatively negligible.

关 键 词：钢筋混凝土 柱 水平侧移 耐火极限 

分 类 号：TU352[建筑科学—结构工程]