尖端形椭圆钢管混凝土构件压扭复合受力性能分析  

Analysis of mechanical behavior of oval-ended elliptical concrete-filled steel tubular members under compression and torsion loads

作　　者：王静峰[1,2] 盛鸣宇 沈奇罕 马贤峰 WANG Jingfeng;SHENG Mingyu;SHEN Qihan;MA Xianfeng(School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China;Anhui Collaborative Innovation Center of Advanced Steel Structure Technology and Industrialization,Hefei 230009,China)

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009 [2]安徽先进钢结构技术与产业化协同创新中心,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2021年第6期777-784,共8页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(51478158,51178156);教育部新世纪优秀人才支持计划资助项目(NCET-12-0838)。

摘　　要：文章基于等效本构模型建立了尖端形椭圆钢管混凝土(oval-ended elliptical concrete-filled steel tubular,OECFST)构件在压扭复合受力下的有限元分析模型,揭示了OECFST构件在压扭复合受力状态下的受力机理和破坏模式,探讨了不同截面形式下轴压比对扭矩转角曲线的影响,分析了钢材强度、混凝土强度、含钢率、长短轴比及截面面积等参数的影响规律。结果表明:OECFST构件在压扭复合受力下表现出良好的塑性性能,且轴压下抗扭承载力随着钢材强度、含钢率的增大而增大,随着长短轴比的增大而减小,混凝土强度的改变对其影响较小;随着约束效应系数增大,轴压比值与扭矩比值的相关系数有所提高,长短轴比和尺寸效应对其影响较小。研究成果可为OECFST结构设计和应用提供参考。The finite element(FE)analysis model of oval-ended elliptical concrete-filled steel tubular(OECFST)member under compression and torsion was established based on the equivalent constitutive model,and the stress mechanism and failure modes of OECFST members under compression and torsion were revealed.The influence of axial compression ratio on torque-angle curve under different cross-sections was discussed,and the effects of steel strength,concrete strength,steel content,long-to-short axis ratio and cross-sectional area were analyzed.The results show that the OECFST members exhibit good plastic properties under compression and torsion loads.The torsional bearing capacity under axial compression increases with the increase of steel strength and steel content,and decreases with the increase of long-to-short axis ratio,the change of concrete strength has little influence on it.With the increase of the constraint effect coefficient,the correlation between the axial compression ratio and the torque ratio is improved,and the long-to-short axis ratio and size effect have less influence on it.The research results can provide reference for the design and application of OECFST structures.

关 键 词：尖端形椭圆钢管混凝土(OECFST)构件 压扭复合受力 破坏模式 参数分析 有限元 

分 类 号：TU398.9[建筑科学—结构工程]