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| 矩形钢管微膨胀陶粒混凝土短柱轴压极限承载力研究 |
| Ultimate bearing capacity of micro-expansive ceramsite concrete filled rectangular steel tubular short column under axial compression |
| 投稿时间：2018-10-12 |
| DOI： |
| 中文关键词: 矩形钢管混凝土 微膨胀陶粒混凝土 轴压承载力 短柱 修正公式 |
| 英文关键词: concrete filled rectangular steel tube micro-expansive ceramsite concrete axial compressive capacity short column modified formula |
| 基金项目:国家自然科学基金资助项目(51778630)；湖北省教育厅科学研究计划项目(B2017559). |
| 作者 | 单位 | E-mail | | 朱红兵 | 武汉科技大学城市建设学院,湖北 武汉,430065 | hnhyzhb@163.com | | 赵本露 | 武汉科技大学城市建设学院,湖北 武汉,430065 | | | 李秀 | 武汉交通职业学院交通工程学院,湖北 武汉,430065 | | | 袁强松 | 武汉科技大学城市建设学院,湖北 武汉,430065
湖北中烟卷烟材料厂,湖北 武汉,430051 | | | 胡天宇 | 湖北中烟卷烟材料厂,湖北 武汉,430051 | |
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| 中文摘要: |
| 以矩形钢管截面长宽比(1、1.5、2)、含钢率(11%、16%)、陶粒混凝土中膨胀剂掺量(12%、16%)为设计变量,制作了12组(每组2根)矩形钢管微膨胀陶粒混凝土短柱试件,进行轴压承载力测试。然后利用试验数据对几种常见的钢管混凝土承载力计算公式进行对比分析,并在统一理论公式的基础上提出了计算矩形钢管微膨胀陶粒混凝土短柱轴压承载力的修正公式。试验结果表明,试件的弹性极限可以达到其极限荷载的90%左右,同时试件表现出较明显的套箍效应,其承载力提高系数随截面长宽比的增大而减小,随含钢率的提高而增大,并且膨胀剂掺量为12%时的承载力提高系数较大。修正公式的计算结果与试验结果吻合较好,并且其更适合于工程实际应用。 |
| 英文摘要: |
| Twelve groups (2 specimens in each group) of short columns of micro-expansive ceramsite concrete filled rectangular steel tube (MECCRST) were made for the test of axial compressive strength, with the sectional aspect ratio of rectangular steel tube (1,1.5,2), steel ratio (11%, 16%) and the content of expansive agent in ceramsite concrete (12%, 16%) as design variables. The experimental data were used to compare the applicability of several common formulas for the bearing capacity of concrete filled steel tube. Then a modified formula to calculate the axial compressive bearing capacity of MECCRST short column was presented based on the formula in “Unified Theory”. The test results indicate that elastic limit of MECCRST short column can reach about 90% of its ultimate bearing capacity and the specimens show obvious hoop effect. The bearing capacity enhancement coefficient decreases with the increasing sectional aspect ratio but increases with the increasing steel ratio, and is larger when the expansive agent content is 12%. The calculated values by modified formula agree well with the test results, and the formula is more applicable to practical projects. |
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