| 轴心受压薄壁圆钢管混凝土柱临界径厚比的确定 |
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| 引用本文： | 张耀春,曹宝珠.轴心受压薄壁圆钢管混凝土柱临界径厚比的确定[J].工程力学,2005,22(1):170-174. |
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| 作者姓名： | 张耀春 曹宝珠 |
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| 作者单位： | 哈尔滨工业大学土木工程学院, 哈尔滨, 150090 |
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| 摘 要： | 通过对薄壁圆钢管与内部混凝土的相互作用分析,可以得出薄壁圆钢管与混凝土的应力-应变关系及二者间的作用力。在此基础上,把薄壁钢管纵向单元作为支承在弹性地基上的压杆,推导出钢管出现局部屈曲的临界应力和临界径厚比。由于内部混凝土的存在,大大提高了薄壁钢管的临界屈曲应力和径厚比。对Q235钢材、C30混凝土短柱构件的计算结果表明,钢管的最小临界径厚比为1700左右。
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| 关 键 词： | 薄壁钢管混凝土 弹性地基 局部屈曲 临界应力 径厚比 |
| 文章编号： | 1000-4750(2005)01-0170-05 |
| 收稿时间： | 2003-03-15 |
| 修稿时间： | 2003-06-21 |
CRITICAL LIMIT OF DIAMETER TO THICKNESS RATIO FOR AXIALLY LOADED CONCRETE FILLED THIN-WALLED CIRCULAR STEEL TUBES |
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| ZHANG Yao-chun,CAO Bao-zhu.CRITICAL LIMIT OF DIAMETER TO THICKNESS RATIO FOR AXIALLY LOADED CONCRETE FILLED THIN-WALLED CIRCULAR STEEL TUBES[J].Engineering Mechanics,2005,22(1):170-174. |
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| Authors: | ZHANG Yao-chun CAO Bao-zhu |
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| Affiliation: | Harbin Institute of Technology College of Civil Engineering, Harbin 150090, China |
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| Abstract: | An analysis of interaction of thin-walled circular steel tube and filled concrete under axial compression is carried out. Acting force and stress-strain relationship between thin-walled steel tube and concrete is presented. An axially compressive thin-walled steel element on elastic foundation is adopted to deduce the critical stress and critical diameter to thickness ratio for circular steel tube in local buckling. It is found that the critical local buckling stress and diameter to thickness ratio of circular steel tube are considerably increased by the support of filled concrete. Calculation for short columns using Grade Q235 steel tube filled with Grade C30 concrete indicates that the critical diameter to thickness ratio of steel tubes is about 1700. |
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| Keywords: | thin-walled concrete filled steel tubes elastic foundation local buckling critical stress diameter-thickness ratio |
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