螺纹连接圆套圆中空夹层钢管混凝土轴压性能试验  

Tests on Mechanical Properties of Concrete-Filled Double-Skin Circular Steel Tubes Connected by Thread Under Axial Compression

作　　者：王庆利 赵杰 彭宽 WANG Qingli;ZHAO Jie;PENG Kuan(School of Civil Engineering,University of Science and Technology Liaoning,Anshan 114044,China;School of Intelligent Manufacturing,Chengdu Technological University,Chengdu 611730,China)

机构地区：[1]辽宁科技大学土木工程学院,辽宁鞍山114044 [2]成都工业学院智能制造学院,成都611730

出　　处：《工业建筑》2024年第7期13-22,共10页Industrial Construction

基　　金：辽宁省“兴辽英才计划”创新领军人才项目(XLYC1902009)。

摘　　要：提出了通过内衬管和螺纹连接方式用以接长钢管的圆套圆中空夹层钢管混凝土。以螺纹的长度、深度和位置为基本参数设计了12个内衬管螺纹连接圆套圆中空夹层钢管混凝土短柱,并开展了轴压试验。将此类试件与普通试件和焊接试件进行对比,分析了试件的轴压力-纵向压缩量曲线、轴压力-钢管应变曲线和破坏模态等,研究了不同参数对试件轴压承载力和刚度的影响。结果表明,在研究的参数范围内,试件的轴压力-纵向压缩量曲线可以划分为弹性阶段、弹塑性阶段、屈服-强化阶段和下降段。内衬管螺纹连接试件的承载力和刚度不逊于普通试件和焊接试件。随着螺纹长度的增加,试件承载力和刚度略有提升;端截面内衬管螺纹连接试件的承载力和刚度优于中截面内衬管螺纹连接试件的。建议了内衬管螺纹连接圆套圆中空夹层钢管混凝土轴压承载力计算方法。A connection method of lengthening the steel tube of concrete-filled double-skin circular steel tube by inner lining tube and threaded connection has been proposed.Taking the length,depth and posi-tion of the thread as the basic parameters,12 concrete-filled double-skin circular steel tube connected by thread through inner lining tube were designed,and the axial compression tests were carried out.By com-paring specimens connected by thread with the ordinary specimens and welded specimens,the axial com-pressive loading-longitudinal compressive displacement curves,axial compressive loading-strain of steel tube curves and failure mode of the specimens were analyzed,and the effects of different parameters on the axial compressive bearing capacity and stiffness of the specimens were studied.The results showed that the axial compressive loading-longitudinal compressive displacement curves of the specimen could be divided into linear elastic stage,elasto-plastic stage,yield-strengthening stage and descending stage within the range of parameters studied.The bearing capacity and stiffness of the specimens connected by thread through inner lining tube were no worse than those of the ordinary specimen or the welded specimens.The bearing capacity and stiffness of the specimens increased with the increase of thread length,and bearing ca-pacity and stiffness of the specimens connected at end section by thread through inner lining tube were high-er than those of the specimens connected at middle section by thread through inner lining tube.The calcula-tion method of the axial compressive bearing capacity of concrete-filled double-skin circular steel tube con-nected by thread through inner lining tube were suggested.

关 键 词：中空夹层钢管混凝土 轴压性能 螺纹连接 内衬管 承载力 

分 类 号：TU398.9[建筑科学—结构工程]