火灾后高强钢管混凝土柱轴压的参数化分析

Parametric Analysis of High-Strength Concrete Filled Steel Tubular Columns Under Axial Compression After Fire

为研究不同参数对火灾后高强钢管混凝土柱受轴压时的性能影响,利用ABAQUS有限元软件模拟火灾后高强钢管混凝土柱轴压模型,对该构件以钢管屈服强度、受火时间、混凝土强度为主要参数进行承载力-位移曲线分析,并剖析火灾后高强钢管混凝土柱典型曲线。结果表明:随着钢管屈服强度和混凝土强度增大,构件极限承载力增大;随着受火时间增加构件极限承载力出现下降趋势;从整体上看,受火时间分别为60、90、120 min时,构件中的混凝土承担主要载荷。

To study the effects of different parameters on the performance of high-strength steel tube concrete columns under axial compression after a fire,ABAQUS finite element software was used to simulate the axial compression model of high-strength steel tube concrete columns after fire.The bearing capacity-displacement curve of the component was analyzed with the main parameters of steel pipe yield strength,fire time and concrete strength,and the typical curve of high-strength concrete-filled steel tube column after fire was analyzed.The results showed that with the increase of the yield strength of the steel pipe and the strength of the concrete,the ultimate bearing capacity of the component increased,and the ultimate bearing capacity of the component decreased with the increase of the fire time,and on the whole,the concrete in the component bore the main load when the fire time was 60,90 and 120 min,respectively.