Study on flexural behavior of seawater sea-sand concrete filled plastic-lined steel tube composite members
A total of 12 seawater sea-sand concrete filled plastic-lined steel tube(SSC-PLST)specimens were tested by flexural loading and finite element modeling.The bending properties of the composite members and the influence of the plastic lining layer on the bending capacity of the composite members were studied.The effect of plastic lining on the load-carrying capacity of SSC-PLST members was investigated.The results show that,the failure pattern of SSC-PLST specimens is similar to that of conventional concrete filled steel tube(CFST)members,namely,the tension zone of steel tube yields and the concrete produces fine and dense flexural cracks,and the compression zone of steel tube buckles and the concrete at the corresponding position is crushed.The bending moment-deflection curve of SSC-PLST members is characterized by three stages,showing good load-carrying and deformation capacities.The contact stress between different components of SSC-PLST member is relatively small and unevenly distributed.The influence of plastic lining on the flexural capacity of SSC-PLST member is mainly related to the thickness of plastic layer,but is less affected by the strength of steel or concrete.Finally,a simplified calculation formula of load-carrying capacity for SSC-PLST flexural members is proposed,which can provide reference for the engineering application of this structural member.
seawater sea-sand concreteplastic-lined steel tubeflexural behaviorfinite element analysis
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