摘要
研究配筋圆钢管混凝土轴压短柱火灾后剩余承载力。利用ABAQUS有限元分析软件建立了ISO-834标准升温曲线升温作用下配筋圆钢管混凝土短柱温度场模型,基于温度场分析结果建立了配筋圆钢管混凝土轴压短柱力学分析模型,利用以往试验结果对模型进行了验证,计算结果与实验结果吻合良好。在此基础上进行了火灾后配筋圆钢管混凝土轴压短柱剩余承载力参数分析,选用的参数包括:升温时间、混凝土强度、钢管强度、钢筋强度、含钢率、配筋率、构件截面尺寸等。研究结果表明:在本次参数范围内,在其它条件相同的情况下,与常温下的承载力相比,受火时间越长,截面尺寸越小,构件火灾后剩余承载力的损失越高。结果可供有关钢管混凝土工程火灾后修复加固参考。
In this work,the post-fire residual load bearing capacity of bar-reinforced concrete-filled circle steel tube short column under axial pressure was studied.First,the temperature field model of bar-reinforced concrete-filled circle steel tube short column under heating part of the ISO-834standard temperature curve was established by ABAQUS（finite element analysis）.Then,the mechanical analysis model of bar-reinforced concrete-filled circle steel tube short column was established based on the temperature field model.The theoretical analysis results by the model of this paper were found to agree well with the previous test results.Based on that,the parametric analysis of post-fire residual load bearing capacity of bar-reinforced concrete-filled circle steel tube short column under axial pressure was studied.The optional parameters included heating up time,concrete strength,steel tube strength,steel bar strength,steel ratio,steel ratio of steel bar,sectional dimension and so on.The analysis results indicate that in the scope of the parameters used in this work,the post-fire residual load bearing capacity decreases with the increase of heating time and decrease of sectional width.
出处
《火灾科学》
CAS
CSCD
2013年第3期147-152,共6页
Fire Safety Science
基金
国家青年自然科学基金资助项目(51208246)
关键词
钢管混凝土
配筋
火灾后
剩余承载力
数值分析
Concrete-filled steel tube
Bar-reinforced
Post-fire
Residual load bearing capacity
Finite element analysis
