吴鹏+赵均海+张常光+朱倩+李艳

建筑科学与工程学报2014年文章编号：16732049(2014)01008307

收稿日期：20131011

基金项目：国家自然科学基金项目(41202191)；陕西省自然科学基础研究计划项目(2011JM7002)；

教育部高等学校博士学科点专项科研基金项目(20110205130001)

作者简介：吴鹏（1988），男，甘肃张掖人，工学硕士研究生

摘要：基于统一强度理论，借助钢管混凝土轴压短柱极限承载力计算公式的推导，得出了极限状态时钢管和混凝土之间的侧压力，提出了界限套箍系数的概念，并给出界限套箍系数的计算公式，同时分析了不同套箍系数时钢管的三向应力和钢管混凝土短柱的轴压应力应变曲线出现不同发展趋势的原因，且理论分析得出的结论与相关文献的试验结果一致，说明分析过程的合理性；最后对影响因素进行了分析，根据分析结果提出了实用建议，并发现相关参考文献的界限套箍系数为该研究结果的特例。

关键词：钢管混凝土；统一强度理论；轴压；套箍系数；应力应变曲线

中图分类号：TU398.9文献标志码：A

Boundary Casing Hoop Coefficient for Concretefilled Steel Tubular

Stub Columns Under Axial CompressionWU Peng, ZHAO Junhai, ZHANG Changguang, ZHU Qian, LI Yan

（School of Civil Engineering, Changan University, Xian 710061, Shaanxi, China）Abstract: Based on unified strength theory, a ultimate bearing capacity calculation formula for concretefilled steel tubular stub columns under axial compression was proposed. The lateral pressure between the steel tube and concrete was given in the ultimate state. The concept of limit casing hoop coefficient was presented, and the calculation formulae of limit casing hoop coefficient were given. Meanwhile, the limit value of casing hoop coefficient was defined to analyze the reasons for different development trends with different casing hoop coefficients appeared in axial compression stressstrain curve, and the theoretical analysis results were similar to the experiment results in relevant literature, and the rationality of analysis process was pointed out. Finally, parametric studies were carried out to analyze the influencing factors, and the practical suggestions were put forward due to the analysis results. It was also found that the limit casing hoop coefficient of relevant references was a special case for this study.

Key words: concretefilled steel tube; unified strength theory; axial compression; casing hoop coefficient; stressstrain curve

0引言

钢管混凝土是钢管内填充混凝土形成的构件，它具有承载力大、塑性和韧性好、施工方便等特点［1］，已被广泛应用于工程实际［2］。目前，确定钢管混凝土轴压短柱极限承载力时所遵循的基本概念是：钢管对核心混凝土提供了约束，使混凝土处于三向受压的应力状态，从而提高了承载力，并认为达到极限状态时钢管环向已经屈服［320］。但不少研究者发现，在构件达到极限状态时，钢管环向并未屈服［2］；……