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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。
In order to study the mechanical properties of RC stub columns after high temperature, 40 specimens were designed by replacing the coarse aggregate, the temperature, the maximum temperature, the concrete strength and the stirrup spacing. 32 specimens, 8 specimens at room temperature) for static loading test. The failure mode of axial compression short column of recycled concrete under high temperature was observed. The mechanical properties such as bearing capacity, stiffness, displacement ductility coefficient and energy dissipation were obtained. The mechanical properties of the specimens with different parameters were analyzed. Bearing Capacity Calculation Method of Recycled Concrete Reinforced Concrete Columns under Axial Pressure. The results show that with the increase of temperature, the appearance color of recycled concrete columns gradually changes from blue-gray to off-white, the mass loss rate gradually increases, and the bearing capacity and initial stiffness of the specimens decrease gradually. Regenerated coarse aggregate replaces The magnitude of the rate has little effect on the bearing capacity and the initial stiffness of the RC stub columns under high temperature. The higher the concrete strength level, the higher the bearing capacity and initial stiffness of the specimen is. The maximum temperature When the stirrup spacing and the spacing of reinforced concrete after high temperature reinforced concrete axial short column mechanical properties of little effect.