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陈宗平*,赵科军,经承贵,张超荣.高温后钢管再生混凝土轴压性能试验及承载力计算[J].实验力学,2019,34(6):991~1002
高温后钢管再生混凝土轴压性能试验及承载力计算
Test of axial compression performance and bearing capacity of recycled concrete filled steel tube after exposed to high temperature
投稿时间:2018-05-07  修订日期:2018-08-11
DOI:10.7520/1001-4888-18-100
中文关键词:  高温后  钢管再生混凝土  轴压性能  承载力计算
英文关键词:after high temperature  steel tube recycled concrete  axial compression performance  calculation of bearing capacity
基金项目:国家自然科学基金项目(51578163);广西自然科学基金重点项目(2016GXNSFDA380032);八桂学者专项经费资助项目(\[2019\]79号);广西重点研发计划项目(桂科AB17292083)
作者单位
陈宗平* 1.广西大学 土木建筑工程学院 南宁 530004 2.广西大学 工程防灾与结构安全教育部重点实验室 南宁 530004 
赵科军 广西大学 土木建筑工程学院 南宁 530004 
经承贵 广西大学 土木建筑工程学院 南宁 530004 
张超荣 广西大学 土木建筑工程学院 南宁 530004 
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中文摘要:
      为了揭示高温后钢管再生混凝土的轴压性能,以再生粗骨料取代率、历经最高温度、高温时长和混凝土强度为变化参数,设计了44个钢管再生混凝土试件进行高温后的静力加载试验。观察了高温前后试件的物理及力学性能变化,得到了受力破坏过程及形态,获取了受力全过程的荷载-变形曲线及峰值荷载、峰值位移、初始刚度、延性系数、能量耗散等特征点参数,并分析了各变化参数对试件轴压性能的影响,最后探讨了高温后钢管再生混凝土轴压极限承载力的计算方法。研究结果表明:随着历经温度的升高,钢管再生混凝土试件外观颜色由浅褐色转变为灰白色,其质量烧失率逐渐增大,试件的承载力和刚度逐渐降低;再生粗骨料取代率和高温时长的变化对高温后钢管再生混凝土轴压短柱力学性能影响不大;混凝土强度等级越高的试件,其遭受高温后的承载力和刚度也越大。
英文摘要:
      In order to reveal the axial compression behavior of steel tube recycled concrete after high temperature,taking the replacement rate of recycled coarse aggregate, the highest temperature, the high temperature duration and the strength variation of concrete as variable parameters, static loading experiments of 44 steel tube recycled concrete specimens after high temperature were designed. The variation of physical and mechanical properties of specimens before and after high temperature was observed. The failure process and pattern were obtained. The load-deformation curve and characteristic parameters including peak load,peak displacement,initial stiffness,ductility coefficient and energy dissipation during whole loading process were obtained. Furthermore,the influence of various parameters on the axial compression performance of specimen was analyzed. Finally, the calculation method of ultimate bearing capacity of steel tube recycled concrete under axial compression was discussed. Results indicate that with the increase of temperature, the appearance color of steel tube recycled concrete changed from light brown to gray white, the mass loss rate increases gradually, and the bearing capacity and stiffness of specimen decrease gradually. The variation of replacement ratio of recycled coarse aggregate and high temperature duration has little effect on the mechanical properties of steel tube recycled concrete under axial compression, and the higher the strength grade of concrete is, the greater the bearing capacity and stiffness of specimen subjected to high temperature.
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