钢筋混凝土L形柱的耐火极限  

Fire Resistance of Reinforced Concrete Column with L-Shaped Cross Section

作　　者：徐玉野[1] 吴波[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：《华南理工大学学报（自然科学版）》2007年第7期110-115,130,共7页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50478078);教育部新世纪优秀人才支持计划资助项目(NCET-04-0819)

摘　　要：利用数值模拟程序RCSSCF,分析了荷载比、柱计算长度、截面尺寸、荷载偏心率、配筋率和荷载角等参数对ISO834标准升温过程作用下钢筋混凝土等肢L形柱耐火极限的影响规律.针对不同荷载比、柱计算长度、截面尺寸、荷载偏心率、配筋率和荷载角共5 400种工况进行了四周受火时钢筋混凝土等肢L形柱的高温反应分析.在此基础上,定量给出了该类构件耐火极限的实用计算方法.研究结果表明:荷载角对L形柱耐火极限的影响较大,且影响规律较为复杂;严格控制荷载比是提高L形柱耐火极限的有效措施.Analyzed in this paper were the influences of several parameters, such as the load ratio, the effective column length, the sectional dimensions, the load eccentricity ratio, the reinforcement ratio and the loading angle on the fire resistance of reinforced concrete columns with L-shaped cross section exposed to the ISO834 standard fire, and 5 400 columns subjected to fire in all sides were used to carry out the fire response analyses, with the above-mentioned parameters being the variables. Based on the analytical results, a practical method to calculate the fire resistance of the column with L-shaped cross section was presented. The results show that the loading angle has significant and complicated effect on the fire resistance of the column, and that reducing the load ratio is an effective method to improve the fire resistance.

关 键 词：混凝土 钢筋混凝土柱 耐火极限 计算 L形截面 

分 类 号：TU375[建筑科学—结构工程]