圆钢管再生镍铁渣混凝土柱偏压力学性能研究  

Study on the mechanical behavior of recycled aggregate concrete with ferronickel slag filled circular steel tube column under bias compression

作　　者：罗才松 王枫轩 付朝江 祁皑[2] LUO Caisong;WANG Fengxuan;FU Chaojiang;QI Ai(Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering,350118 Fuzhou,China;School of Civil Engineering,Fuzhou University,350108 Fuzhou,China)

机构地区：[1]福建省土木工程新技术与信息化重点实验室,福州350118 [2]福州大学土木工程学院,福州350108

出　　处：《应用力学学报》2024年第3期546-556,共11页Chinese Journal of Applied Mechanics

基　　金：福建省自然科学基金资助项目(No.2020J01885);工程结构防灾减灾福建省高校工程研究中心开放基金资助项目(No.2019001);校科研发展基金项目(No.GY-Z160134)。

摘　　要：为了研究再生粗骨料取代率和偏心距对圆钢管再生镍铁渣混凝土柱力学性能的影响,设计了13个试件进行轴心和偏心受压试验,分析试件的荷载-跨中挠度曲线、侧向挠度曲线、刚度退化和耗能。在普通钢管混凝土的研究结果基础上,回归拟合适用于钢管再生混凝土的压弯承载力预测公式。结果表明:偏压试件的挠度沿柱高呈对称分布,形状符合正弦半波曲线;加载过程中截面中性轴的位置向受压区偏移,表明受压区面积逐渐缩小,受压区高度减小;当取代率超过30%后,随着再生粗骨料取代率的增加,试件的极限承载力降低,刚度逐渐退化,试件破坏时的耗能系数表现为降低的趋势;随着偏心距的增大,试件的极限承载力降低,侧向挠度曲线的包络面积逐渐增大,刚度逐渐退化;根据拟合的压弯承载力计算公式得到的计算值与试验结果吻合较好。To study the effects of the replacement rate of recycled coarse aggregate(RCA)and eccentricity on the mechanical properties of recycled aggregate concrete with ferronickel slag filled circular steel tube columns,13 specimens were designed for axial and eccentric compression tests,and load-mid-span deflection curve,lateral deflection curve,stiffness degradation and energy dissipation were analyzed.Based on the research results of ordinary concrete filled steel tube(CFST)column,the prediction formula for the compression-bending capacity of recycled CFST is regressed.Results show that the deflection shape of the biased specimen conforms to the sinusoidal half wave curve.The position of the neutral axis of the cross section deviates to the compression zone during loading.When the replacement rate exceeds 30%,with the increase of RCA replacement rate,the ultimate bearing capacity of the specimen decreases,the stiffness degrades more,and the energy dissipation coefficient of the specimen decreases.With the increase of eccentricity,the ultimate bearing capacity of the specimen decreases,the envelops area of the lateral deflection curve increases gradually,and the stiffness degenerates more.The values calculated by the fitting formulas are in good agreement with the experimental results.

关 键 词：钢管再生混凝土 镍铁渣 偏压试验 刚度退化 耗能能力 承载力公式 

分 类 号：TU398[建筑科学—结构工程]