矩形中空夹层钢管混凝土叠合长柱轴压性能研究  

Behavior of Rectangular Concrete-encased CFDST Long Columns under Axial Compression

作　　者：任庆新[1,2] 付然 王庆贺 REN Qingxin;FU Ran;WANG Qinghe(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168;School of Transportation,Civil Engineering&Architecture,Foshan University,Foshan,China,528225;Liaoning Province Building Science Research Institute Co.Ltd.,Shenyang,China,110005)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]佛山科学技术学院交通与土木建筑学院,广东佛山528225 [3]辽宁省建设科学研究院有限责任公司,辽宁沈阳110005

出　　处：《沈阳建筑大学学报（自然科学版）》2024年第2期212-222,共11页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51808351);辽宁省“兴辽英才计划”项目(XLYC1902027)。

摘　　要：目的 研究矩形中空夹层钢管混凝土叠合长柱的轴压性能,提出轴压稳定承载力实用计算方法。方法 基于ABAQUS有限元分析软件,建立矩形中空夹层钢管混凝土叠合长柱有限元模型,分析其在不同参数下的工作机理;采用叠加原理并结合现行相关规范,给出适用于矩形中空夹层钢管混凝土叠合长柱的轴压稳定承载力计算公式。结果 矩形中空夹层钢管混凝土叠合长柱的破坏形态表现为在构件的中间位置产生侧向挠曲,最终因丧失稳定而破坏;长细比λ和外围混凝土强度fcu, out是影响叠合长柱轴压峰值荷载的关键参数;当λ由29增加到42和55时,峰值荷载分别降低7.3%和15.3%;当fcu, out由40 MPa提高到60 MPa和80 MPa时,峰值荷载分别提高21.4%和44.8%;轴压承载力简化计算公式与有限元模拟所得结果之比的均值和变异系数分别为0.927和0.017。结论 矩形中空夹层钢管混凝土叠合长柱具有良好的抗压性能和初始刚度,所提出的简化计算公式可为实际工程应用提供计算依据。In order to analyze behavior of rectangular concrete-encased CFDST long columns under axial compression,and a practical calculation method for axial compression stability loading capacity is proposed.A finite element model of rectangular CFDST long column is established on ABAQUS,and its working mechanism was analyzed under different parameters.Finally,by adopting the principle of superposition and combining with the relevant existing codes,the formulae for calculating the axial compression stability load capacity applicable to rectangular concrete-encased CFDST long columns are proposed.Results showed that the damage pattern of the rectangular concrete-encased CFDST long column is characterized by deflection in the middle of the column and eventual damage due to loss of stability.The length to slenderness ratio(λ)and the strength of the outer concrete(f cu,out)are key parameters affecting the top axial compression load of long stacked columns.Asλincreases from 29 to 42 and 55,the top load capacity decreases by 7.3%and 15.3%respectively;as f cu,out increases from 40 MPa to 60 MPa and 80 MPa,the top load increases by 21.4%and 44.8%respectively.The mean and the coefficient of variation of the ratio between the simplification formula for the axial bearing capacity and the results derived from the FEM simulations are 0.927 and 0.017 respectively.The conclusions show that rectangular concrete-encased CFDST long columns have excellent compressive properties and initial stiffness,and the simplified calculation formulae can provide basis for calculation in practical engineering.

关 键 词：矩形中空夹层钢管混凝土叠合长柱 轴压性能 稳定承载力 有限元分析 

分 类 号：TU398.1[建筑科学—结构工程]