钢管活性粉末混凝土柱轴压受力性能和极限承载力试验研究

发布时间：2018-04-18 18:43

本文选题：钢管混凝土柱 + 活性粉末混凝土　；参考：《北京交通大学》2013年硕士论文

【摘要】：本文在以往国内外试验研究的基础上,通过试验对20根钢管RPC短柱和14根钢管RPC长柱进行了轴压力学性能分析,在试验数据的基础上得出钢管RPC柱荷载-应变曲线,分析钢管RPC柱各阶段破坏过程,建立钢管RPC柱有限元模型,并结合以往试验数据拟合出钢管RPC柱极限承载力经验公式,主要研究成果如下： 1、通过对20根钢管RPC短柱和14根钢管RPC长柱进行轴压力学性能试验,根据试验现象和试验数据,归纳分析了钢管RPC轴压短柱破坏过程主要分为4个阶段：弹性阶段、弹塑性阶段、荷载下降段、强化阶段；钢管RPC轴压长柱破坏过程主要分为3个阶段：弹性阶段、弹塑性阶段、卸载阶段。 2、重点分析了各因素对钢管RPC轴压短柱和长柱的影响,对于钢管RPC轴压短柱,A、B两种加载方式的荷载-应变曲线基本相同,认为加载方式对钢管RPC轴压短柱力学性能的影响不大；钢管RPC轴压短柱的极限承载力随着套箍系数的增大而增大。对于钢管RPC轴压长柱,随着长细比的增大,试件的极限承载力降低,且后期强度下降的越快；大长细比下的套箍系数对钢管RPC长柱仍然有较大的影响,试件的极限承载力会随着套箍系数的增加为增加。 3、综合分析以往钢管RPC轴压试验研究数据,对139根钢管RPC轴压短柱和40根钢管RPC轴压长柱进行极限承载力统计分析,通过拟合分析,分别建立起钢管RPC轴压短柱极限承载力经验公式和钢管RPC轴压长柱长细比稳定系数经验公式。 4、应用大型有限元分析软件ABAQUS,借鉴以往有限元计算参数,分别对钢管RPC轴压短柱和钢管RPC轴压长柱进行有限元建模分析,将所得有限元计算曲线与试验曲线进行对比分析,发现总体吻合状况良好,但存在个别试件有限元结果与试验结果出现偏差,原因主要有原材料的强度稳定性差,离散性大,试件加载时存在一定的偏心,试件的初始缺陷等因素的影响。
[Abstract]:In this paper, the axial compressive mechanical properties of 20 steel tube RPC short columns and 14 steel tube RPC long columns are analyzed based on the previous domestic and foreign experimental studies. The load-strain curves of steel tube RPC columns are obtained on the basis of experimental data.The failure process of steel tube RPC column is analyzed, the finite element model of steel tube RPC column is established, and the empirical formula of ultimate bearing capacity of steel tube RPC column is fitted by combining with the previous experimental data. The main research results are as follows:1. According to the experimental results of axial compression mechanical properties of 20 steel tube RPC short columns and 14 steel tube RPC long columns, the failure process of steel tube RPC short columns under axial compression is summarized and analyzed according to the experimental phenomena and experimental data. The failure process of RPC short columns is divided into four stages: elastic stage.The failure process of RPC long columns under axial compression is divided into three stages: elastic stage, elastic-plastic stage and unloading stage.2. The influences of various factors on the axial compression of short columns and long columns of steel tube RPC are analyzed. The load-strain curves of the two loading modes of RPC short columns of steel tube are basically the same. It is considered that the loading mode has little effect on the mechanical properties of RPC columns of steel pipe.The ultimate bearing capacity of RPC short columns increases with the increase of hoop coefficient.For steel tube RPC axial compression column, the ultimate bearing capacity of the specimen decreases with the increase of the aspect ratio, and the later strength decreases faster, and the hoop coefficient under the large slenderness ratio still has a great influence on the steel tube RPC column.The ultimate bearing capacity of the specimen will increase with the increase of the hoop coefficient.3. Based on the data of RPC axial compression test of steel tube, the ultimate bearing capacity of 139 RPC short columns and 40 RPC long columns are analyzed by fitting analysis.The empirical formulas for ultimate bearing capacity of RPC short columns under axial compression of steel tubes and the empirical formulas for the ratio stability coefficient of length to slenderness of long columns under axial compression of steel tube RPC are established respectively.4. The finite element analysis software Abaqus is used to model and analyze the RPC short column of steel tube and the long column of RPC axial compression of steel tube respectively, and the calculated curve is compared with the test curve.It is found that the overall agreement is good, but there is a deviation between the finite element results of individual specimens and the test results. The main reasons are the strength stability of raw materials is poor, the dispersion is large, and there is a certain eccentricity when the specimens are loaded.The effect of the initial defect on the specimen.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU398.9

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