摘要
在确定了钢材和混凝土在高温作用后应力 应变关系模型的基础上 ,本文利用数值分析方法成功地计算出ISO 83 4规定的标准升温曲线作用后圆钢管混凝土和方钢管混凝土压弯构件荷载 变形关系曲线 ,理论计算结果和试验结果基本吻合。在系统分析火灾持续时间、构件截面含钢率、钢材种类、混凝土强度等级、荷载偏心率和构件截面尺寸等因素对火灾作用后钢管混凝土构件承载力影响规律的基础上 。
The bearing capacity of concrete?filled steel tubular(CFST)columns after fire is studied in the paper.Based on the determined stress?strain relationship of steel and concrete after high temperatures,the load?deflection curve of CFST beam?columns after fire is got by the numerical analysis method.The numerical results are in good agreement with the measurements.It is found that the fire duration,the slenderness ratio,the steel ratio,and the sectional dimension have significant influence on the bearing capacity.Through the study,a simplified method is proposed to calculate the bearing capacity of CFST columns after fire,some conclusions are obtained.
出处
《土木工程学报》
EI
CSCD
北大核心
2002年第4期25-35,共11页
China Civil Engineering Journal
关键词
火灾
钢管混凝土
柱
承载力
concrete filled steel tubes,standard fire,bearing capacity,residual strength
