【作者】 翟喜梅； 查晓雄； 王战； 万城勇；

【Author】 Zhai Ximei;Zha Xiaoxiong;Wang Zhan;Wan Chengyong;Shenzhen Graduate School,Harbin Institute of Technology;State Grid Shandong Economics Research Institute;

【机构】 哈尔滨工业大学深圳研究生院； 国网山东省电力公司经济技术研究院；

【摘要】 薄壁圆钢管混凝土具有焊接方便、安装快速、节省材料及成本等优势,但现有钢管混凝土规范为保证局部稳定的要求,限定了圆钢管混凝土径厚比在135×(235/f_y)以内,套箍指标范围为0.5~2.0,当薄壁圆钢管混凝土的径厚比大于135×(235/f_y)或套箍指标在0.5以内,没有相关的规范提供参考。为对薄壁圆钢管混凝土径厚比或套箍指标超出规范要求的情况提供计算参考,本文结合圆钢管混凝土的特点,通过理论推导及试验验证的方法分析了最大径厚比达到331×(235/f_y)的承载力及判别局部屈曲的问题,并通过有限元软件ABAQUS模拟的方法,分析套箍指标小于0.5的情况,并进行相关公式的推导。结果表明:在径厚比331×(235/f_y)以内的钢管混凝土不会发生局部屈曲,同时在套箍系数0.5以内承载力是套箍系数一次线性关系。最终得出了薄壁圆钢管混凝土径厚比限值可放宽至331×(235/f_y),套箍系数0.5以内的承载力计算公式可以为套箍系数一次函数的结论,为对钢管混凝土规范中薄壁圆钢管混凝土的径厚比和套箍系数的范围作出补充,也为实际工程情况提供了参考依据。更多还原

【Abstract】 Concrete-filled thin-walled circular steel tube has its unique advantages such as convenient to weld, fsat to install, saving materials and fewer cost, but the existing codes of concrete-filled steel tube to avoid local buckling limit the radius-thickness ratio within 135×(235/f_y) and the confining factor range within 0.5~2.0. There is no relevant design specification to reference for the concrete-filled thin-walled circular steel tube whose radius-thickness ratio is larger than 135×(235/f_y), or confining coefficient is smaller than 0.5, which restricts the development of concrete-filled thin-walled circular steel tube. In order to provide a reference for above-mentioned situation, combining the characteristics of the concrete-filled thin-walled circular steel tube, the bearing capacity and local buckling problem has been verified of the maximum radius-thickness ratio with through theoretical derivation and experimental analysis. And analyze the situation of the confining factor range smaller than 0.5 by means of finite element soft called ABAQUS and formula derivation. The results show that the column does not have local buckling in the radius-thickness ratio of 331×(235/f_y), and the expression equation of the bearing capacity is the first linear relationship of the confining coefficient. Thus, the limit value of radius-thickness ratio of the column can be extended to 331×(235/f_y), and the formula for calculating the bearing capacity can be set as the first linear relationship of confining coefficient. The conclusion supplements the codes about radius-thickness ratio and confining coefficient, and provides a reference for engineering practice.更多还原