圆锥形中空夹层钢管混凝土压扭构件力学性能分析  

Analysis of mechanical properties of tapered concrete-filled double skin steel tubular members subjected to compression and torsion

作　　者：苏义峰 范家浩 史艳莉[1] Su Yifeng;Fan Jiahao;Shi Yanli(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《建筑科学》2021年第1期42-49,共8页Building Science

基　　金：国家自然科学基金(编号:51768038);甘肃省高等学校协同创新团队项目资助(2018C-08)。

摘　　要：为了研究圆锥形中空夹层钢管混凝土在压扭复合受力下的力学性能,通过有限元软件ABAQUS建立了圆中空夹层钢管混凝土压扭构件的数值模拟模型,并与已有的试验结果进行对比,验证了模型的正确性。用同样建模方法对圆锥形中空夹层钢管混凝土压扭构件进行了数值分析,分析了该类构件在压扭复合作用下的扭矩-转角全过程关系曲线、各部件的承载力分配等,讨论了轴压比、空心率、锥度、混凝土强度及钢管强度对构件受力性能的影响规律。结果表明:构件的扭矩-转角全过程曲线可以分为弹性、弹塑性、塑性强化三个阶段;加载过程中轴压比、混凝土强度、内钢管强度和空心率的变化对其极限扭矩的影响较小,锥度和外钢管强度的变化对该类构件抗扭承载力影响较大。本文所建议的抗扭承载力计算方法与数值模拟结果吻合良好。In order to study the mechanical performance of tapered concrete-filled double skin steel tubular(CFDST)members subjected to compressive and torsion load,the numerical models are established using ABAQUS software and compared with the existing test results.The rationality of the model is verified.This method is used to analyze this type of composite members.The whole torsion-rotation relationship,the bearing capacity distribution of the components are investigated,respectively.The axial load ratio,hollow ratio,tapered angle,concrete and steel strength to the influence of force performance of components are analyzed.The results indicate that the torsion-rotation relationship can be divided into three stages:elastic stage,elastic-plastic stage,and plastic strengthening stage.Axial load ratio,concrete strength,strength of inner steel tube and hollow ratio have little effect on its ultimate torsion moment.Tapered angle and strength of outer steel tube have a greater effect on the torsional capacity of such members.The calculation method proposed in this paper is in good agreement with the numerical simulation results.

关 键 词：圆锥形中空夹层钢管混凝土 压扭作用 工作机理 扭矩-转角关系 大空心率 有限元分析 

分 类 号：TU398[建筑科学—结构工程]