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最佳替代率下石墨尾矿混凝土柱抗震性能拟静力试验

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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.
Pseudo-static Experiment on the Seismic Performance of Graphite Tailings Concrete Columns with Optimal Substitution Rate
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 com-pressive 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-con-sumption capacity and seismic performance.

graphite tailings concretemechanical propertiespseudo-static experimenthysteretic curveaseismic capacity

王东旭、公茂盛

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中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江哈尔滨 150080

地震灾害防治应急管理部重点实验室,黑龙江哈尔滨 150080

石墨尾矿混凝土 力学性能 拟静力试验 滞回曲线 抗震性能

中国地震局工程力学研究所基本科研业务费专项资助项目中国地震局工程力学研究所基本科研业务费专项资助项目国家自然科学基金项目国家自然科学基金项目

2019C112021EEEVL03015217851451678541

2024

10.20015/j.cnki.ISSN1000-0666.2024.0049

地震研究
云南省地震局

地震研究

CSTPCD北大核心
影响因子：0.884
ISSN：1000-0666
年,卷(期)：2024.47(3)
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