圆台形大空心率中空夹层钢管混凝土构件压扭性能研究  

Compression-torsion behavior of tapered concrete-filled double-skin steel tubular members with large hollow ratio

作　　者：邓然[1,2] 周绪红 王宇航[1] 冀卫东[3] 文浩 DENG Ran;ZHOU Xuhong;WANG Yuhang;JI Weidong;WEN Hao(School of Civil Engineering,Chongqing University,Chongqing 400045,China;Department of Civil and Environmental Engineering,The Hong Kong Polytechnic University,Hong Kong 999077,China;Goldwind Science&Creation Wind Power Equipment Co.,Ltd,Beijing 100176,China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]香港理工大学土木及环境工程学系,中国香港999077 [3]金风科创风电设备有限公司,北京100176

出　　处：《建筑结构学报》2024年第3期136-147,共12页Journal of Building Structures

基　　金：国家自然科学基金项目(52278144,52308212);中央高校基本科研业务费专项(2022CDJQY-009)。

摘　　要：圆台形大空心率中空夹层钢管混凝土(TLHR-CFDST)基于传统中空夹层钢管混凝土(CFDST)发展而来,在实际工程中常受到压-扭复合荷载作用。为研究TLHR-CFDST构件的压扭性能,设计了6个试件并进行静力加载试验,主要试验参数包括锥角、空心率和轴压比。在试验的基础上,建立TLHR-CFDST压扭构件的有限元模型,进一步分析其工作机理和参数影响。结果表明:在压扭荷载作用下,TLHR-CFDST构件在上部截面发生破坏;当锥角增大时,构件的抗扭刚度和受扭承载力下降,而空心率对受扭承载力影响较小;当轴压比不超过0.4时,构件表现出良好的延性,但当轴压比大于0.4后,构件的扭矩-扭转角曲线出现下降段,受扭承载力有较大程度的降低;在钢管的约束下,混凝土受扭开裂后可以继续承担荷载;构件在不同参数下的压扭承载力相关曲线基本一致。基于承载力相关方程,建立了适用于TLHR-CFDST构件的压扭承载力计算方法,该方法预测的承载力与试验及数值计算结果吻合较好。Tapered concrete-filled double-skin steel tubular members with a large hollow ratio(TLHR-CFDST)are a new variation of concrete-filled double-skin steel tubular members(CFDST).In engineering practice,TLHR-CFDST members are often subjected to combined compression-torsional loads.To study the coupled compression-torsion behavior of TLHR-CFDST members,6 specimens were designed and tested.The examined parameters in the test included the tapered angle,the hollow ratio and the axial compressive ratio.A finite element(FE)model was established to analyse the working mechanism and parameter effects of the member.The results show that the member mainly fails in the upper sections.The torsional stiffness and the torsional capacity of the member decrease when the tapered angle increases whilst the effect of the hollow ratio on the torsional capacity is not significant.The member has good ductility when the axial compressive ratio is less than 0.4,whereas the torque-torsional angle curve shows a considerable descending branch when the axial compressive ratio exceeds 0.4.Under the confinement of the steel tube,concrete can continue to resist the torsional load after cracking.The compression-torsion capacity correlations of TLHR-CFDST members are similar under different parameters.A design method was proposed to predict the ultimate capacity of the TLHR-CFDST member under combined compression-torsional loads.The predicted bearing capacities agree well with the tested data and the simulated results.

关 键 词：中空夹层钢管混凝土构件 锥角 大空心率 复合荷载作用 静力试验 有限元分析 压扭性能 

分 类 号：TU398.903[建筑科学—结构工程]