矩形钢管混凝土构件受弯和压弯承载力统一公式  

Unified flexural and compression-flexural bearing capacity formula for concrete-filled rectangular steel tubular members

作　　者：许强 廖志浩 盛于洲 孟协华 XU Qiang;LIAO Zhihao;SHENG Yuzhou;MENG Xiehua(Zhejiang Jiecheng Construction Co.,Ltd.,Hangzhou 311200,China;Tongxiang Housing and Urban-Rural Development Bureau,Jiaxing 314500,China)

机构地区：[1]浙江杰城建设有限公司,杭州311200 [2]桐乡市住房和城乡建设局,嘉兴314500

出　　处：《建筑结构》2024年第23期70-78,共9页Building Structure

摘　　要：目前针对方形和矩形钢管混凝土构件受弯和压弯承载力的理论和试验研究很多,承载力计算公式多种多样,但可比性不强。通过引入一个综合钢与混凝土强度比、截面板件宽厚比的新特征参数γ,基于塑性极限理论,推导出矩形钢管混凝土受弯和压弯构件通用的塑性极限承载力公式,同时对γ的物理意义做了阐述。基于所推导的新理论公式,重新绘制了钢管混凝土压弯构件的N-M相关曲线,给出了曲线上各关键点的准确坐标,并与现有规范公式规定的N-M相关曲线做对比,对上述规范公式的合理性、准确性、适用范围做了适当讨论。所推导的新理论公式适用于各种钢混强度组合、截面高宽比的矩形钢管混凝土截面(包括钢管壁厚不等的情况),且形式简洁、概念明确。At present,there are many theoretical and experimental researches on the flexural and compression-flexural bearing capacity of concrete-filled square steel tubular(CFST)members and concrete-filled rectangular steel tubular(CFST)members,the bearing capacity formulas are various,but the comparability is not strong.By introducing a new characteristic parameterγ,which synthesizes the strength ratio of steel to concrete and the width to thickness ratio of section plate,and based on the plastic limit theory,the general formula of plastic limit bearing capacity of flexural and compression-flexural CFST members was derived.At the same time,the physical meaning ofγwas expounded.Based on the derived new theoretical formula,the N-M correlation curve of CFST members was redrawn,the accurate coordinates of each key point on the curve were given,compared with the N-M correlation curve stipulated by the existing specification formula,the rationality,accuracy and scope of application of the above specification formula were properly discussed.The new theoretical formula is suitable for CFST sections with various steel-concrete strength combinations and section aspect ratios(including the case of unequal wall thickness of steel tubes),and the form is simple and the concept is clear.

关 键 词：矩形钢管混凝土 压弯构件 受弯承载力 压弯承载力 N-M相关曲线 特征参数 

分 类 号：TU398[建筑科学—结构工程]