相对两面受火下的加劲薄壁方钢管混凝土中长柱抗火性能研究  

Study on fire resistance of medium long stiffened thin-walled concrete-filled square steel tubular column under fire on opposite sides

作　　者：吕学涛 刘鑫 郑致远 LV Xue-tao;LIU Xin;ZHENG Zhi-yuan(School of Transportation,Civil Engineering&Architecture,Foshan University,Foshan 528225,China)

机构地区：[1]佛山科学技术学院交通与土木建筑学院,广东佛山528225

出　　处：《佛山科学技术学院学报（自然科学版）》2022年第5期17-22,共6页Journal of Foshan University(Natural Science Edition)

摘　　要：为了分析相对两面受火下加劲薄壁方钢管混凝土中长柱的抗火性能,利用ABAQUS有限元软件建立ISO-834标准火灾作用下加劲薄壁方钢管混凝土中长柱温度场模型和耐火极限模型。利用模型分析相对两面受火条件下混凝土跨中截面温度梯度分布和纵向应力分布规律;在此模型基础上分析荷载比、截面尺寸、含钢率、计算长度等参数对构件耐火极限的影响规律。结果表明:荷载比和计算长度的增加均会降低构件的耐火极限,增大截面尺寸和含钢率可以有效提高构件的耐火极限,在荷载比相同的条件下,钢管屈服强度的增大会适当提高构件的耐火极限。In order to analyze the fire resistance of the stiffened thin-walled concrete-filled square tube(CFST)medium long column under the action of fire on both sides,the temperature field and mechanical field models of the stiffened CFST medium long column under the action of fire on both sides were established by using ABAQUS finite element software and ISO-834 standard rising and cooling curves.The temperature gradient distribution and longitudinal stress distribution of concrete mid-span section under fire on both sides are analyzed by using the model.On this basis,the influence of load ratio,section size,steel ratio,calculation length and other parameters on the fireproof limit of components is further analyzed.The results show that the increase of load ratio and effective length will reduce the fire resistance limit of the component,and the increase of section size and steel content can effectively improve the fire resistance limit of the component.Under the same load ratio,the increase of yield strength of steel pipe will appropriately improve the fire resistance limit of the component.

关 键 词：相对两面受火 加劲肋 方钢管混凝土 火灾下 

分 类 号：TU392.3[建筑科学—结构工程]