钢管活性粉末混凝土长柱轴压性能试验研究

发布时间：2018-04-10 18:00

本文选题：钢管活性粉末混凝土 + 长柱　；参考：《中国铁道科学》2014年01期

【摘要】：通过14根钢管活性粉末混凝土(钢管RPC)长柱试件的轴压试验,研究钢管RPC柱的长细比及大长细比下套箍系数对钢管RPC柱轴压性能的影响。结果表明:试件的破坏基本属弹性失稳破坏类型,其中长细比较小的试件除弯曲失稳破坏外还伴随着局部受压鼓曲破坏,长细比越小,试件的延性破坏特点越明显,随着长细比的增加,试件也由弹性破坏逐渐转向失稳破坏;试验得到的钢管RPC长柱轴压荷载—应变曲线主要分为弹性阶段、弹塑性阶段和卸载阶段;在相同套箍系数下,随着长细比的增加,钢管RPC长柱的极限承载力和极限位移均逐渐降低;在大长细比下试件的套箍系数越大,其极限承载力也越大,但增加的幅度逐渐变小,钢管对RPC的约束能力不如普通混凝土。
[Abstract]:Based on the axial compression tests of 14 specimens of steel tube reactive powder concrete (RPCL) columns, the effects of the aspect ratio of steel tube RPC columns and the hoop coefficient under the large aspect ratio on the axial compression properties of RPC steel tube columns are studied.The results show that the failure of specimen belongs to the type of elastic instability, and the failure of the specimen with smaller length and smaller length is accompanied by local buckling failure under local compression. The smaller the aspect ratio, the more obvious the ductility of the specimen is.With the increase of slenderness ratio, the specimen gradually changed from elastic failure to instability failure. The axial load-strain curves of steel tube RPC columns were mainly divided into elastic stage, elastic-plastic stage and unloading stage, and under the same hoop coefficient, the axial load-strain curves of RPC columns were divided into three stages: elastic stage, elastic-plastic stage and unloading stage.With the increase of slenderness ratio, the ultimate bearing capacity and ultimate displacement of steel tube RPC columns decrease gradually, and the larger the hoop coefficient is, the larger the ultimate bearing capacity is, but the smaller the increasing range is.The restraint ability of steel pipe to RPC is not as good as that of ordinary concrete.
【作者单位】：北京交通大学土木与建筑工程学院;
【基金】：教育部中央高校基本科研业务费资助项目(2013YJS056)
【分类号】：TU398.9

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