钢筋砼十字形柱的耐火极限研究  

FIRE RESISTANCE OF REINFORCED CONCRETE COLUMNS WITH +-SHAPED CROSS SECTION

作　　者：吴波[1] 徐玉野[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,广州510640

出　　处：《工程力学》2008年第3期167-173,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(50478078);教育部新世纪优秀人才支持计划项目(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标准升温作用下钢筋砼等肢十字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、荷载偏心率和配筋率共1080种工况进行了四周受火时钢筋砼等肢十字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。研究表明:荷载角对十字形柱耐火极限影响较小;严格控制荷载比是提高十字形柱耐火极限的有效措施。The influence of several parameters, such as load ratio, effective column length, section dimensions, load eccentricity ratio, reinforcement ratio and load angle, on the fire resistance of reinforced concrete column with ＋-shaped cross section and exposed to the ISO834 standard fire, is analyzed. 1080 columns with ＋-shaped cross section and subjected to fire on all sides were selected for fire response analysis. Different load ratios, effective column lengths, dimensions of cross section, load eccentricity ratios and reinforcement ratios are considered in the analysis. Based on the simulation results, a practical calculation method for the fire resistance of columns with ＋-shaped cross section and subjected to fire on all sides is given in this paper. Simulation results show that： （a） load angle has little influence on the fire resistance of column with ＋-shaped cross section; and （b） reducing load ratio is an effective measure to improve the fire resistance of column with ＋-shaped cross section.

关 键 词：钢筋混凝土柱 耐火极限 十字形截面 影响因素 实用计算方法 

分 类 号：TU375[建筑科学—结构工程] TU352.5