三面受火型钢混凝土柱耐火极限的试验研究与理论分析

Experimental and Theoretical Investigation on Steel Reinforced Concrete Columns under 3-Side Heating

制作了2根三面受火型钢混凝土柱,在标准升温条件下进行耐火极限试验,测量了构件轴向变形及中部侧向变形,观察了混凝土的爆裂及构件破坏过程,获得了构件的耐火极限。然后应用有限元软件ABAQUS建立了三面受火型钢混凝土柱三维非线性有限元模型,计算结果得到了试验数据的验证。结果表明,火灾荷载比及偏心率对三面受火型钢混凝土柱的耐火极限有很大的影响,有限元模型可以用来模拟三面受火型钢混凝土柱的温度场及耐火极限。

Fire resistance tests on two steel reinforced concrete（SRC） columns subjected to 3-side standard fire exposure were conducted.The axial deformation and lateral displacement at the middle height were measured,and the cracking of the concrete and damage procedure of the columns were observed,and then the fire resistance of the column was obtained.A three-dimensional nonlinear finite element model was established by using ABAQUS to analyze the behavior of SRC columns under 3-side heating,which showed reasonable agreement with the test.The results indicate that the load ratio and eccentricity have noticeable influence on the fire resistance of SRC columns under 3-side heating,and the finite element model suggested in this paper can be used to evaluate the thermal and mechanic response of SRC columns under 3-side heating.