摘要
为研究再生骨料替代率、长径比、径厚比对圆钢管再生镍铁渣混凝土中长柱轴心受压承载力的影响,对8个圆钢管再生镍铁渣混凝土中长柱进行轴心受压单调加载试验,获得所有试件的破坏形态、承载力、跨中挠度等特征值,对比国内外常用的钢管混凝土规范所推荐的轴压承载力计算方法,回归拟合轴压承载力预测公式,并与试验结果进行对比.研究结果表明:中长柱在两端位置出现的局部鼓曲现象为材料破坏形态,长柱为整体失稳破坏形态.相同再生粗骨料取代率和截面尺寸的中长柱较长柱承载力好,挠度增长也较慢;随着径厚比增大,承载力降低,延性也降低,钢管对再生混凝土的套箍效应明显,拟合公式简单实用,且与实测值吻合较好.
In order to study the effect of the replacement rate of recycled coarse aggregate,length-diameter ratio and diameter-thickness ratio on the axial compressive bearing capacity of middle long columns of recycled aggregate concrete with ferronickel slag filled steel tubes(RACFNSFST),the monotonic loading tests were carried out on eight RACFNSFST under axial compression.By comparing the calculation method of axial compressive capacity recommended by the domestic and foreign common concrete-filled steel tube codes,the prediction formula of axial compressive capacity is fitted by regression and compared with the test results.The results show that local buckling occurs at both ends of the medium and long column,which is the failure mode of material,and the long column is the failure mode of whole instability.The medium and long columns with the same reclaimed coarse aggregate substitution rate and section size have better bearing capacity and slower deflection growth than that of the long columns.With the increase of diameter-thickness ratio,the bearing capacity and ductility are reduced,and the hoop effect of steel tube on recycled concrete is obvious.The fitting formula is simple and practical,and it is in good agreement with the measured value.
作者
罗才松
王枫轩
付朝江
陈华艳
祁皑
LUO Caisong;WANG Fengxuan;FU Chaojiang;CHEN Huayan;QI Ai(College School of Civil Engineering,Fuzhou University,Fuzhou 350108,China;Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering,Fuzhou 350118,China)
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2022年第4期329-336,共8页
Journal of Liaoning Technical University (Natural Science)
基金
福建省自然科学基金(2020J01885)
东南沿海工程结构防灾减灾福建省高校工程研究中心项目(2019001)
福建工程学院科研发展基金(GY-Z160134)
关键词
钢管再生混凝土柱
镍铁渣
中长柱
轴压性能
承载力
recycled aggregate concrete-filled steel tube
ferronickel slag
middle long column
axial compression behavior
bearing capacity
