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