不锈钢筋-圆不锈钢管海砂混凝土构件受弯性能研究OA

In this paper,a finite element(FE)analysis model was developed to investigate the flexural behavior of stainless steel bars-sea sand concrete filled circular stainless steel tubular specimen.Based on the FE model,the stress mechanism under pure bending was investigated.The influences of concrete strength,steel tubular yield strength,yield strength of the longitudinal bars,steel ratio of the steel tube,and longitudinal bar ratio on the bending performance of the composite member were investigated.The results highlight the significant enhancement in flexural bearing capacity due to embedded longitudinal bars.Additionally,the flexural bearing capacity of the composite column increased with higher concrete strength,steel tubular yield strength,yield strength of the longitudinal bars,steel ratio of the steel tube,and longitudinal bar ratio.Moreover,the composite bending stiffness increased with higher concrete strength,steel ratio of the steel tube,and longitudinal bar ratio,while decreased with higher yield strength of the steel tube or longitudinal bars.The study also identified that current calculation methods overestimated the flexural stiffness but underestimated the flexural resistance of such members.Through 60 FE examples,simplified models for estimating the bending resistance and composite bending stiffness of such members were regressed.The simplified calculation results show good agreement with the FE predictions.