薄壁钢管轻骨料混凝土轴压短柱承载力分析*
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肖海兵1，赵均海2，孙楚平1，彭宁1，孙珊珊2(1 中信建筑设计研究总院有限公司，武汉 430014； 2 长安大学建筑工程学院，西安 710061)［摘要］运用统一强度理论，考虑中间主应力的影响，引入参数αu，βu确定薄壁钢管在极限荷载时的环向拉应力σθ、纵向压应力σz和径向压应力σr，并考虑轻骨料混凝土与普通混凝土多轴强度准则差异的影响，推导出薄壁钢管轻骨料混凝土轴压短柱的极限承载力公式，并对影响因素进行了分析。将本文计算结果与文献试验数据进行比较，结果吻合良好，表明将统一强度理论运用于薄壁钢管轻骨料混凝土轴压短柱承载力计算是可行的。该结果为薄壁钢管轻骨料混凝土的优化设计提供了一定的理论依据。［关键词］统一强度理论； 薄壁钢管； 轻骨料混凝土； 极限承载力中图分类号：TU398文献标识码：A文章编号：1002848X(2012)10010106Bearing capacity of thin-walled steel tube short columns filled with lightweight aggregate concrete under axial loadXiao Haibing1, Zhao Junhai2, Sun Chuping1, Peng Ning1, Sun Shanshan2(1 CITIC General Institute of Architectural Design and Research Co., Ltd., Wuhan 430014, China; 2 School of Civil Engineering, Chang'an University, Xi'an 710061, China)Abstract: Based on the unified strength theory, considering the effects of the intermediate principal stress and the differences of the multi-axial strength criterion for the lightweight aggregate concrete and common concrete, by introducing parameter αu and βu, loop tensile stress σθ, longitudinal compressive stress σz and radial compressive stress σr of the thin-walled steel tube in ultimate bearing condition were obtained. Thus the calculation formula of ultimate bearing capacity of thinwalled steel tube short columns filled with lightweight aggregate concrete was deduced, and the influence complication was analyzed. Compared with the obtained solution and the test results in reference, good agreement can be found. The results indicate that the unified strength theory has the good applicability in the calculation of ultimate bearing capacity of thin-walled steel tube short columns filled with lightweight aggregate concrete. The results can provide theoretical foundation for the design of thin-walled steel tube filled with lightweight aggregate concrete.Keywords: unified strength theory; thin-walled steel tube; lightweight aggregate concrete; ultimate bearing capacity*陕西省自然科学基金资助项目（SJ08E204）。作者简介：肖海兵，硕士，助理工程师，Email: mailongwan@163.com。参考文献［1］ 陶忠, 于清. 新型组合结构柱——试验、理论与方法［M］. 北京: 科学出版社, 2006.［2］李帼昌, 刘之洋. 自应力钢管轻骨料混凝土结构［M］. 沈阳: 东北大学出版社, 2001.［3］王秋萍. 薄壁钢管混凝土轴压短柱力学性能的试验研究［D］. 哈尔滨: 哈尔滨工业大学, 2002.［4］刘新义. 薄壁方钢管轻质混凝土轴压短柱的力学性能研究［D］. 石河子: 石河子大学, 2007.［5］杨明. 钢管约束下核心轻集料混凝土基本力学性能研究［D］. 南京: 河海大学, 2006.［6］王晓亮. 钢管高强轻集料混凝土短柱轴压力学性能试验研究［D］. 南京: 河海大学, 2006.［7］傅中秋, 吉伯海. 长细比对钢管轻集料混凝土轴压柱受力性能的影响［J］. 工业建筑, 2010, 40(1): 112-115.［8］吉伯海, 傅中秋, 胡正清. 钢管轻集料混凝土短柱偏心受压性能的试验［J］. 交通科学与工程, 2009, 25(3): 22-28.［9］吉伯海, 傅中秋, 沈云, 等. 圆钢管轻集料混凝土抗弯刚度计算方法的探讨［J］. 建筑结构, 2009, 39(6): 47-49.［10］查晓雄, 宋瑞强, 吕赫男. 空心薄壁方钢管混凝土柱局部屈曲时宽厚比限值的确定［J］. 建筑结构, 2010, 40(1): 19-22.［11］刘哲锋, 苏志力, 杨伟军. 轻骨料混凝土与普通混凝土框架结构的抗震性能分析［J］. 建筑结构, 2010, 40(2): 22-24.［12］俞茂宏. 双剪理论及其应用［M］. 北京: 科学出版社, 1998.［13］蔡绍怀. 现代钢管混凝土结构［M］. 北京: 人民交通出版社, 2003.［14］赵均海. 强度理论及工程应用［M］. 北京: 科学出版社, 2003.［15］KENJI SAKINO, HIROYUKI NAKAHARA, SHOSUKE MORINO, et al. Behavior of centrally loaded concrete-filled steel-tube short columns ［J］. Journal of Structural Engineering, ASCE, 2004(2): 180-188.
