论文部分内容阅读
在实际火灾中,结构中的柱子有可能处于三面受火的状态。由于受火边界的差异,其耐火性能与四面受火的情况有所不同。为认识三面受火型钢混凝土(SRC)柱的耐火性能,进行了两根ISO-834标准火灾作用下三面受火(受拉侧不受火)SRC柱在偏心荷载作用下的耐火极限试验,观察了试件的破坏过程,取得了截面温度场分布、变形-时间关系曲线等数据,并分析了有关规律及机理。试验结果表明:达到耐火极限状态时,型钢的温度较低;混凝土爆裂对截面温度场及构件耐火极限均有影响;荷载比和偏心率是影响高温下SRC偏压构件变形特征及耐火极限的重要因素。试验结果可供三面受火SRC柱耐火设计参考。
In an actual fire, the columns in the structure may be in a state of fire on three sides. Due to differences in the fire border, the fire resistance is different from the situation on fire. In order to know the fire resistance of SRC columns on three sides, the fire resistance test of SRC columns with three sides exposed to fire (tension-free side) subjected to ISO-834 standard fire under eccentric load was observed and observed The destructive process of the specimen was obtained and the temperature field distribution, deformation-time curve and other data were obtained, and the relevant laws and mechanisms were analyzed. The results show that the temperature of the profile steel is lower when the refractory limit state is reached, the concrete burst affects both the cross-section temperature field and the refractory limit of the component, and the load ratio and eccentricity are the important factors that affect the deformation characteristics and the fire resistance limit of SRC bias members under high temperature factor. Test results for three sides of fire SRC column refractory design reference.