摘要
CFRP钢管混凝土的轴压承载力与很多因素有关,由于材料制造、使用等原因,这些参数并不是一个确定的值。基于此,考虑参数的不确定性,对CFRP钢管混凝土的轴压承载力进行灵敏度分析。考虑了9个参数并生成参数样本值,使用ABAQUS的脚本语言Python对CFRP钢管混凝土进行参数化建模,调用ABAQUS的批处理器计算极限承载力。分析了极限承载力的局部灵敏度和全局灵敏度,针对全局灵敏度计算量大、计算时间长的问题,提出了通过二阶响应面建立拟合的函数关系,运用傅里叶幅值检验扩展法计算其全局灵敏度指数。研究表明:钢管内径对极限承载力的影响最大。对比局部灵敏度和全局灵敏度2种分析方法,参数在小范围内变化,局部灵敏度分析可以快速得到理想的结果。若各参数的变异性相差太大,使用全局灵敏度分析更为准确。
The axial compressive bearing capacity of CFRP concrete-filled steel tube is related to many factors.Due to material manufacturing and use,these parameters are not a definite value.Based on this,this paper carries out the sensitivity analysis of axial compressive bearing capacity of CFRP concrete-filled steel tube with consideration of the uncertainty of parameters,conducts the parametric modeling of CFRP concrete-filled steel tube with Python,ABAQUS scripting language based on nine parameters and parameter sample values,calculates the ultimate bearing capacity by ABAQUS batch processor,analyzes the local and global sensitivity of ultimate bearing capacity,establishes the fitting function relation by the second order response surface aiming at the problem of large amount and long time of global sensitivity calculation,and calculates the global sensitivity index by the extended Fourier amplitude sensitivity test.The results show that:The inner diameter of steel tube has the greatest influence on the ultimate bearing capacity.By comparing the two methods of local sensitivity and global sensitivity,the parameters vary in a small range,and the ideal results can be obtained quickly through local sensitivity analysis.If the difference in variability of each parameter is too big,the results from global sensitivity analysis are more accurate.
作者
伍剑
邹宏
徐志纯
王坤云
WU Jian;ZOU Hong;XU Zhichun;WANG Kunyun(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China)
出处
《人民珠江》
2021年第9期98-104,共7页
Pearl River
基金
国家自然科学基金(11972095、11472064)。
关键词
CFRP钢管混凝土
极限承载力
灵敏度分析
二阶响应面
傅里叶幅值检验扩展法(EFAST)
CFRP concrete-filled steel tube
ultimate bearing capacity
sensitivity analysis
second order response surface
extended Fourier amplitude sensitivity test(EFAST)
作者简介
伍剑,男,主要从事结构灵敏度研究等工作。E-mail:wujian1478@sina.com。
