摘要
研究了带直角等六边形钢管混凝土柱的局压性能,进行了20个该类组合柱的局压试验,主要研究端板厚度、局压面积比和含钢率等参数对该类组合柱局压性能的影响规律.试验表明,该类试件的局压承载力和端板厚度成正比,和局压面积比成反比;设置端板可显著提高该类试件的承载力.基于数值模型的机理分析表明:该类局压构件的荷载主要由混凝土承担;钢管约束力主要集中在角部;无端板试件的钢管可提供更大约束力;加载垫块形状对于无端板试件的局压承载力有较大影响;在距加载端0~1.2B(B为钢管边长)的范围内钢管对核心混凝土形成较强约束.参数分析表明,局压承载力随着局压面积比的增大而降低,但随着混凝土强度或端板厚度的增大而提高.含钢率、钢材强度和偏心率对局压承载力的影响较小.最终提出了该类组合柱局压承载力的简化预测模型.
The local compressive performance of hexagonal concrete-filled steel tubular(HCFST)columns with right angles was studied.Local compressive tests on this type of 20 HCFST columns were carried out.The effects of the end plate thickness,local compressive area ratio,and steel ratio on the local compressive performance of the HCFST column were studied.The test shows that the local compressive strength of the HCFST specimen is propor⁃tional to the thickness of the end plate and inversely proportional to the local compressive area ratio.The end plate can significantly improve the local compressive strength of the HCFST specimen.The mechanism analysis based on the numerical model shows that for the HCFST specimen under local pressure,the load is mainly taken by the con⁃crete.The confinement of the steel tube is mainly concentrated in the corner.The steel tube of the HCFST specimen without the end plate can provide greater confinement.The shape of the loading block has a great influence on the lo⁃cal compressive strength of the HCFST specimen without the end plate.The steel tube can form strong confinement on the core concrete within the range of 0~1.2B(where B is the side length of the steel tube)from the loading end.The parametric analysis shows that the local compressive strength decreases with the increases of the local compres⁃sive area ratio but increases with the increase of the concrete strength or the thickness of the end plate.The steel ra⁃tio,steel strength and eccentricity have a moderate effect on the local compressive strength.Finally,a simplified pre⁃dicting model of the local compressive strength of the HCFST column was proposed.
作者
王志滨
戴鸿伟
汪炳坤
李栋
WANG Zhibin;DAI Hongwei;WANG Bingkun;LI Dong(College of Civil Engineering,Fuzhou University,Fuzhou 350108,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2023年第5期11-21,共11页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金资助项目(52178122)
福建省自然科学基金项目(2021J01603)
泉州市科技计划项目(2021C015R,2020N010s)。
关键词
带直角等六边形钢管混凝土
局压
面积比
承载力
有限元模型
简化预测模型
hexagonal concrete-filled steel tubular(HCFST)columns with right angles
local pressure
area ratio
bearing capacity
finite element model
simplified predicting model
