设平板加劲肋矩形钢管混凝土柱屈曲性能分析与设置原则研究  

Analytical analysis of local buckling of rectangular section CFT column with longitudinal stiffener and design principle of longitudinal stiffener

作　　者：朱荣军 王双双 张元植[1,3] Zhu Rongjun;Wang Shuangshuang;Zhang Yuanzhi(Tongji University,Shanghai 200092,China;Chengdu Chengdian Electric Power Engineering Design Co.,Ltd.,Chengdu 610041,China;Sichuan Institute of Building Research,Chengdu 610081,China)

机构地区：[1]同济大学,上海200092 [2]国网四川省电力公司经济技术研究院,四川成都610041 [3]四川省建筑科学研究院,四川成都610081

出　　处：《土木工程学报》2018年第12期42-51,共10页China Civil Engineering Journal

基　　金：国家自然科学基金(51208375)

摘　　要：文中根据能量变分原理,采用瑞利-里兹法对设肋钢管混凝土钢管板件的局部屈曲性能进行研究,推导出设肋板件(刚性基层)屈曲系数,并在此基础上推导得到平板加劲肋的最小刚度要求。然后,对影响加劲肋最小截面刚度的因素进行分析,分析结果表明,加劲肋最小截面刚度和加劲肋面积与钢管壁板件面积的比值、管壁宽厚比、钢材屈服强度、钢管壁抗弯刚度有关;随着钢管壁宽厚比的增大,所需加劲肋最小抗弯刚度增大;随着加劲肋设置道数的增加,所需加劲肋最小抗弯刚度减小。最后,建立大量经试验验证了的ABAQUS有限元模型进行参数分析,数值计算参数分析结果较好地验证了文中所推导解析解的正确性。数值计算结果表明,当加劲肋的设置满足本文提出的最小刚度要求时,大宽厚比的钢管板件能够达到全截面有效,可按照我国相关规范进行承载力设计。In this work,energy-variational principle was used to study the local buckling performance of rectangular section CFT columns with stiffeners.The buckling coefficient of the rectangular plate with stiffeners was obtained via using the Rayleigh-Ritz energy approach.Furthermore,the minimum stiffness requirement was deduced.Then,the influencing factors on the minimum stiffness were analyzed.It was manifested that the minimum stiffness was affected by As/bt,the width to thickness ratio of steel plate,yield strength of steel and flexural rigidity of steel plate in steel tube.The minimum stiffness increased with the increase of the width to thickness ratio of steel plate.The minimum stiffness decreased with the increase of the number of longitudinal stiffener.Finally,parametric analysis was conducted using the commercial finite element software ABAQUS,and the accuracy of the finite element model was verified by a large number of tests.It was shown that the correctness of analytical solution proposed here agreed well with the numerical simulations.Numerical simulations disclose that when the setting of longitudinal stiffeners meets the minimum stiffness requirement,the rectangular section CFT columns with large ratio of width to thickness shall be full-section efficient and can be designed according to the relevant codes in China.

关 键 词：矩形钢管混凝土柱 加劲肋 屈曲系数 数值分析 设置方法 

分 类 号：TU398.2[建筑科学—结构工程]