| 工字钢-混凝土组合梁弹性约束畸变屈曲研究 |
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| 引用本文： | 叶继红,陈伟.工字钢-混凝土组合梁弹性约束畸变屈曲研究[J].建筑结构学报,2011,32(6):82-91. |
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| 作者姓名： | 叶继红 陈伟 |
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| 作者单位： | 东南大学 混凝土及预应力混凝土结构教育部重点实验室， 江苏南京 210096 |
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| 基金项目： | 江苏省自然科学基金项目 |
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| 摘 要： | 约束畸变屈曲是不同于侧向屈曲和畸变屈曲的一类特殊的屈曲形式，通常发生在组合梁负弯矩区。基于弹性地基压杆方法对组合梁弹性约束畸变屈曲进行了研究。将Svensson压杆模型进行改进，考虑了腹板参与部分，并推导了两种基于改进压杆模型的变轴力稳定计算表达式。借助于有限元方法，分析了现有变轴力弹性地基压杆方法用于组合梁约束畸变屈曲的求解精度，研究结果表明：弹性地基压杆方法对组合梁作用纯弯矩及三角形负弯矩情况符合良好，但对非线性弯矩分布情况精度较差。对约束畸变屈曲引入等效弯矩假设，并对其适用性进行了分析，提出了约束畸变屈曲等效弯矩假设临界长度简化公式，进而通过三步简化实现了连续组合梁弹性约束畸变屈曲计算。图16表7参17
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| 关 键 词： | 弹性地基压杆方法 等效弯矩假设 约束畸变屈曲 组合梁 |
Elastic restrained distortional buckling of I-steel-concrete composite beams |
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| YE Jihong,CHEN Wei.Elastic restrained distortional buckling of I-steel-concrete composite beams[J].Journal of Building Structures,2011,32(6):82-91. |
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| Authors: | YE Jihong CHEN Wei |
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| Affiliation: | Key Laboratory of C & PC Structures of China Ministry of Education, Southeast University, Nanjing 210096, China |
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| Abstract: | As a special buckling mode,restrained distortional buckling(RDB) is different from overall buckling and distortional buckling,and usually occurs in the negative moment region of the composite beams.The present paper investigates the elastic RDB of composite beams based on the elastically supported column(ESC) method.Firstly,Svensson's ESC model is properly improved by including the participation of the web as part of the buckling column,and two kinds of theoretical expressions for the improved ESC subjected... |
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| Keywords: | composite beam elastically supported column method equivalent moment assumption restrained distortional buckling |
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