摘要
目的研究方中空夹层钢管混凝土叠合构件的纯扭性能,提出抗扭承载力计算公式。方法运用ABAQUS有限元分析软件建立方中空夹层钢管混凝土叠合构件有限元模型,分析其受扭工作机理和影响构件承载力的重要参数,最后通过叠加法得出抗扭承载力计算公式。结果受力全过程可分为弹性阶段、弹塑性阶段、塑性阶段;在弹性阶段,各部件之间协同作用,产生相互作用力,但相对较小;在弹塑性阶段,外部混凝土与钢管分离,无相互作用力产生;通过分析构件在纯扭作用下的工作机理,确定了外钢管强度、直径及径厚比是影响构件抗扭承载力的重要参数;通过叠加法得出的纯扭公式计算值与有限元模拟值偏差在10%以内,公式相对可靠。结论方中空夹层钢管混凝土叠合构件具有良好的抗扭性能,笔者基于叠加原理提出的纯扭公式可精确地计算其抗扭承载力。
To study the behavior of square concrete-encased CFDST members under pure torsion,a calculation formula for torsional bearing capacity was proposed.The ABAQUS was used to establish the model of square concrete-encased CFDST members,the working mechanism of the members under pure torsion and the important parameters affecting the bearing capacity of the members were analyzed.Finally,the pure torsion calculation formula was proposed by the superposition method.The whole process of stress can be divided into three stages:elastic stage,elastoplastic stage,plastic stage.In the elastic stage,the members were subjected to synergistic force,and an interaction force was generated,but it was relatively small.In the elastoplastic stage,the outer concrete was separated from the steel tube and no interaction occurs.The working mechanism of members under pure torsion was analyzed,and the outer steel tube′s strength,diameter and diameter thickness ratio were important parameters affecting the torsional bearing capacity of the members.The deviation between the calculated value of the pure torque formula obtained by the superposition method and the simulated value of the finite element was within basically 10%,and the formula was relatively reliable.The square concrete-encased CFDST members have good torsional bearing behavior,and the pure torsional formula proposed in this paper based on the superposition principle can better calculate its torsional bearing capacity.
作者
任庆新
蔡雨晨
王庆贺
REN Qingxin;CAI Yuchen;WANG Qinghe(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168;School of Civil Engineering and Transportation,Foshan University,Foshan,China,528225;School of Energy and Architectural Engineering,Shandong Huayu University of Technology,Dezhou,China,253034)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2024年第6期984-993,共10页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51808351)
沈阳市科学技术计划项目(21-108-9-34)。
关键词
方中空夹层钢管混凝土叠合构件
纯扭
有限元分析
工作机理
square concrete-encased CFDST members
pure torsion
finite element analysis
working mechanism
