地震研究

为研究石墨尾矿替代砂子最佳比率及石墨尾矿混凝土柱抗震性能,对4种比率(10%、20%、30%、40%)下石墨尾矿部分替代砂子的混凝土进行了抗压强度、劈裂抗拉强度和静力受压弹性模量等试验,将试验结果与普通混凝土进行对比,确定了石墨尾矿替代砂子的最佳比率,然后以该替代率下的混凝土制作了一个柱试件并进行了拟静力试验,最后根据石墨尾矿混凝土柱破坏特征、滞回曲线、骨架曲线、刚度特性及耗能能力等结果分析了其抗震性能。结果表明:30%替代率下的石墨尾矿混凝土抗压强度和抗拉强度均最高,弹性模量高于其他替代率,且与普通混凝土相差较小,说明30%为最佳替代率; 石墨尾矿混凝土柱在低周往复拟静力加载下呈现弯曲破坏特征,滞回曲线饱满圆滑并具有较好延性,且随着加载位移的增加,试件的割线刚度逐渐减小,等效黏滞阻尼比逐渐增大,整体表现出良好的耗能能力和抗震性能。

In order to study the optimal ratio for the graphite tailings substituting for sand and the seismic performance of the concrete column with graphite tailings,the concrete columns with graphite tailings at four ratios(10%,20%,30% and 40%)were tested to verify the pressive strength,the splitting tensile strength and the static compressive elastic modulus,and these parameters were compared with their corresponding parameters of the ordinary concrete and the optimal ratio for the graphite tailings substituting for sand was determined:30%.Then a concrete column specimen at this optimal ratio was made and was subjected to a pseudo-static experiment.Based on the specimen's damage characteristics,hysteretic curve,and skeleton curve,the seismic performance of the concrete column with graphite tailings was analyzed.The results show that the compressive strength and the tensile strength of concrete with graphite tailings at optimal ratio of 30% are the highest,and the modulus of elasticity is higher than that of concrete with other ratios and close to that of the ordinary concrete,indicating that the optimal ratio is 30%.The concrete column with graphite tailings shows bending damage characteristics under low circumferential,reciprocal,and quasi-static loading,and the hysteretic curves are full and smooth,and the column has good ductility.With the increase of horizontal displacement,the secant stiffness of the specimen gradually decreases,and the equivalent viscous damping ratio gradually increases.The column as a whole exhibits good energy-consumption capacity and seismic performance.

引言
1 材料性能试验
2 拟静力试验
3 试验结果与分析
4 结论

表1 GTC配合比<br/>Tab.1 The mix proportion of GTC

表1 GTC配合比
Tab.1 The mix proportion of GTC

图1 两种尺寸的混凝土试块<br/>Fig.1 Concrete specimens in two sizes

图1 两种尺寸的混凝土试块
Fig.1 Concrete specimens in two sizes

表2 GTC力学性能试验结果<br/>Tab.2 Mechanical properties from the GTC test

表2 GTC力学性能试验结果
Tab.2 Mechanical properties from the GTC test

图2 GTC力学性能试验过程<br/>Fig.2 Procedure of GTC mechanical properties test

图2 GTC力学性能试验过程
Fig.2 Procedure of GTC mechanical properties test

表3 石墨尾矿与砂子物理性质对比<br/>Tab.3 Comparison of physical properties between the graphite tailing and the sand

表3 石墨尾矿与砂子物理性质对比
Tab.3 Comparison of physical properties between the graphite tailing and the sand

表4 钢筋力学性能试验结果<br/>Tab.4 Mechanical properties of steel bars from the test

表4 钢筋力学性能试验结果
Tab.4 Mechanical properties of steel bars from the test

表5 试件设计参数<br/>Tab.5 Design parameters of the specimen

表5 试件设计参数
Tab.5 Design parameters of the specimen

图3 试件尺寸及配筋<br/>Fig.3 Size and reinforcement of the specimen

图3 试件尺寸及配筋
Fig.3 Size and reinforcement of the specimen

图4 拟静力试验装置<br/>Fig.4 Pseudo-static experiment setup

图4 拟静力试验装置
Fig.4 Pseudo-static experiment setup

图5 拟静力加载制度<br/>Fig.5 Loading protocol of the pseudo-static experiment

图5 拟静力加载制度
Fig.5 Loading protocol of the pseudo-static experiment

图6 试件最终破坏形态<br/>Fig.6 Failure state of the specimen

图6 试件最终破坏形态
Fig.6 Failure state of the specimen

图7 滞回曲线及骨架曲线<br/>Fig.7 Hysteretic curves and the skeleton curve

图7 滞回曲线及骨架曲线
Fig.7 Hysteretic curves and the skeleton curve

图8 割线刚度曲线<br/>Fig.8 The curve of secant stiffness

图8 割线刚度曲线
Fig.8 The curve of secant stiffness

图9 等效黏滞阻尼比<br/>Fig.9 Equivalent viscous damping ratios

图9 等效黏滞阻尼比
Fig.9 Equivalent viscous damping ratios

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备注

引言

1 材料性能试验

2 拟静力试验

3 试验结果与分析

4 结论

期刊信息