方钢管螺旋箍筋混凝土轴压短柱极限承载力分析  

ULTIMATE BEARING CAPACITY ANALYSIS OF SQUARE CONCRETE-FILLED STEEL TUBULAR WITH SPIRAL STIRRUPS UNDER AXIAL COMPRESSION

作　　者：赵均海[1] 韩庚阳 张常光[1] 

机构地区：[1]长安大学建筑工程学院,西安710061

出　　处：《钢结构》2017年第4期33-37,43,共6页Steel Construction

基　　金：国家自然科学基金项目(41202191;51508028);陕西省社会发展科技攻关项目(2015SF272);陕西省自然科学基金项目(2014JQ7290)

摘　　要：根据约束力构成不同将混凝土截面分成4部分,综合考虑方钢管和螺旋箍筋对核心混凝土的约束差异。利用面积等效将方钢管转化为圆钢管,在统一强度理论厚壁圆筒塑性极限荷载统一解的基础上,推导方钢管螺旋箍筋混凝土轴压短柱的极限承载力计算式。利用已有文献数据对承载力计算式进行验证,分析材料拉压比、中间主应力系数、箍筋间距、箍筋强度等参数对承载力的影响。对极限承载力计算式进行退化处理,得到适用于方钢管混凝土柱、圆钢管混凝土柱、圆钢管螺旋箍筋混凝土柱的轴压极限承载力计算式。The area of concrete was divided into 4 parts according to composition of restriction.The restriction from both spiral stirrups and steel tubular had been taken into consideration.The square steel tubular was considered as circular one that had the same areas of steel.A formula was deduced on the basis of the unified solution of limit strength of thick wall cylinder using the unified strength theory.After comparison,the bearing capacity obtained by the formula agreed well with the test results in reference.Parameter analysis on bearing capacity had been done with unified strength theory parameters,such as the tension-compression strength ratio,the strength of spirals and the space between them.At last,the calculation formula was introduced to stub columns under axial compression with cross sections such as square,circular and circular with spirals.

关 键 词：统一强度理论 螺旋箍筋 方钢管混凝土 轴压短柱 极限承载力 

分 类 号：TU398.9[建筑科学—结构工程]