中空夹层薄壁钢管混凝土柱偏心受压性能研究  

Behavior of concrete-filled double-skin thin-walled steel tubular columns under eccentric compression

作　　者：王志滨[1] 高扬虹 池思源 廖飞宇 WANG Zhibin;GAO Yanghong;CHI Siyuan;LIAO Feiyu(College of Civil Engineering, Fuzhou University, Fuzhou 350108, China;Fujian Jiantai Costruction Technology Company Limited, Fuzhou 350500, China;College of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China)

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]福建建泰建筑科技有限责任公司,福建福州350500 [3]福建农林大学交通与土木工程学院,福建福州350002

出　　处：《建筑结构学报》2018年第5期124-131,共8页Journal of Building Structures

基　　金：国家自然科学基金项目(51308124);福建省自然科学基金项目(2017J01696);福州市科技计划项目(2017-G-101)

摘　　要：为考察偏心距和长细比对采用带纵向加劲肋的薄壁外管中空夹层钢管混凝土柱受力性能的影响,进行5个方套圆中空夹层薄壁钢管混凝土长柱的偏压试验。试验结果表明：构件的极限荷载随着偏心距和长细比的增大而下降;该类构件的延性低于传统中空夹层钢管混凝土柱。针对试验模型,对中空夹层薄壁钢管混凝土偏压柱进行了有限元模拟,有限元计算结果和试验结果吻合较好。基于有限元模型开展了机理分析和参数分析,结果表明：外部薄壁钢管的约束主要集中在横截面角部很小的范围,核心混凝土承担了大部分荷载;混凝土强度、钢材屈服强度、径厚比、径宽比、长细比直接影响轴力-弯矩相关曲线的形状。基于研究成果,提出了中空夹层薄壁钢管混凝土柱偏心受压时承载力的简化计算式,供工程实际参考。In order to investigate the effects of the eccentricity and slenderness ratio on the behaviors of concrete-filled double-skin steel tubular columns with the outer stiffened thin-walled steel tube, the tests of five slender concrete-filled double-skin thin-walled steel tubular （CFDSTST） columns with outer square hollow section and inner circular hollow section under the eccentric compression were carried out. The test results indicate that the load-carrying capacity decreases with the increase of the eccentricity and slenderness ratio. The ductility of this composite column is lower than traditional CFDST columns. The finite element （FE） simulation of CFDTST columns under eccentric compression was performed. The FE predictions agreed well with the test results. Based on the FE model, the mechanical and parametric analyses were carried out. The mechanical analysis indicates that the confinement of the outer steel tube is focused on a small region at the corner of the cross-section. And the most of the loading is carried by the core concrete. The parametric analysis indicates that the shape of the axial compression versus moment interaction curve is directly affected by the concrete strength, steel yield strength, diameter to thickness ratio, diameter to width ratio or slenderness ratio. A simplified calculation method was proposed to predict the load-carrying capacities of CFDTST columns under eccentric compression, and it is useful for real project.

关 键 词：中空夹层薄壁钢管混凝土柱 方套圆截面 纵向加劲肋 偏心受压试验 有限元分析 受压机理 承载力 

分 类 号：TU398.902[建筑科学—结构工程] TU317.1