高温后钢筋再生混凝土轴压短柱受力性能试验研究

发布时间：2018-05-31 02:37

本文选题：钢筋再生混凝土 + 短柱　；参考：《建筑结构学报》2015年06期

【摘要】：为了研究高温后钢筋再生混凝土轴压短柱的受力性能,以再生粗骨料取代率、温度、最高温度持时、混凝土强度和箍筋间距为变化参数,设计40个试件(其中高温后试件32个、常温对比试件8个)进行静力加载试验。观察了高温后钢筋再生混凝土轴压短柱的破坏形态,获得了其承载力、刚度、位移延性系数和耗能等力学性能指标,并对不同变化参数试件的力学性能指标进行分析,探讨了高温后钢筋再生混凝土轴压短柱的承载力计算方法。研究结果表明:随着温度升高,钢筋再生混凝土柱的外观颜色逐渐由青灰色转变为灰白色,其质量烧失率逐渐增大,试件的承载力和初始刚度逐渐降低;再生粗骨料取代率的大小对高温后钢筋再生混凝土轴压短柱的承载力和初始刚度的影响不大;混凝土强度等级越高的试件,其遭受高温后的承载力和初始刚度也越大;最高温度持时和箍筋间距的变化对高温后钢筋再生混凝土轴压短柱力学性能影响不大。
[Abstract]:In order to study the mechanical properties of the short column of rebar rebar concrete after high temperature, the static loading test of 40 specimens (32 at high temperature and 8 at normal temperature) was designed with the replacement rate of recycled coarse aggregate, temperature and maximum temperature, and the distance between the stirrup and the reinforcement. The static loading test was carried out for the rebar regeneration after high temperature. The bearing capacity, stiffness, displacement ductility coefficient and energy dissipation are obtained, and the mechanical properties of the specimens with different parameters are analyzed. The calculation method of the bearing capacity of the short column of rebar rebar concrete after high temperature is discussed. The results show that the rebar regenerates with the increase of temperature. The appearance color of the concrete column gradually changed from green gray to gray white, the loss rate of the mass increased gradually, the bearing capacity and initial stiffness of the specimen decreased gradually; the size of the replacement rate of recycled coarse aggregate had little effect on the bearing capacity and initial stiffness of the reinforced concrete axial compression short column after high temperature; the higher the concrete strength grade, the higher the test of the concrete strength grade. The higher the bearing capacity and the initial stiffness after being subjected to high temperature, the maximum temperature holding time and the change of the spacing of the stirrup have little effect on the mechanical properties of the rebar reinforced concrete after the high temperature.
【作者单位】：广西大学土木建筑工程学院;广西大学工程防灾与结构安全教育部重点实验室;
【基金】：国家自然科学基金项目(51268004) 广西科技攻关项目(桂科-攻12118023-3)
【分类号】：TU317;TU375.3

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