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
许强 1廖志浩 2盛于洲 1孟协华1
作者信息
- 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
- 折叠
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.
Abstract
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 parameter γ,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 of γ was 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Key words
concrete-filled rectangular steel tubular/compression-flexural member/flexural bearing capacity/compression-flexural bearing capacity/N-M correlation curve/characteristic parameter引用本文复制引用
出版年
2024
NETL
NSTL
万方数据