标准火灾下轴压型钢混凝土柱抗火性能研究

A Study on the Fire Resistance of Steel Reinforced Concrete Axial Compressive Columns under Standard Fire

进行了1根标准火灾下轴压型钢混凝土柱的抗火性能试验。试验采用恒载升温的试验方法,炉温采用ISO-834标准升温曲线。测量了试件内部的温度场和试件轴向位移随时间的变化曲线,了解了试件的破坏过程。试验结果表明:混凝土爆裂对截面温度场分布、构件变形和耐火极限有较大的影响;截面温度场分布基本对称,温度沿构件纵向分布略有差别;试件经历了初始膨胀变形阶段、材料随温度升高而降低导致的变形发展阶段和变形急剧增加的破坏阶段。

The fire resistance of the 1 axial compressive steel reinforced concrete（SRC） column under the stan-dard fire was tested.The method of the temperature elevating with constant load was used throughout the experi-ment,and the heating was applied and controlled according to the standard ISO-834 temperature curve.The in-ner temperature field and the change curve of the axial displacement with time and damage procedure of the specimen were observed,the process of the specimen damaging was learned.The results show that the concrete spoil has largely influenced the temperature field distribution of the cross sections,deformation of the specimen and the degree of the fire resistance.The temperature field of the cross section was basically symmetrical,and the temperature distribution in the vertical component was slightly different.The deformation of SRC columns experi-enced three stages： the initial deformation while inflating,the development of deformation while the material de-creases with temperature increasing,and the damage stage with the dramatic increasing in deformation.