Finite Element Analysis on Flexural Performance of Reinforced Hollow High Strength Concrete Filled Steel Tube Members
Flexural properties of concrete elements with reinforced hollow steel tubes(RHHCFST)was studied to provide some reference for practical engineering.ABAQUS was used to build a finite element model of RHHCFST members,and test results were used to verify the accuracy of the model.Based on this,the whole process of loading and the influence of the yield strength of steel,compressive strength of concrete,wall thickness of steel tube,diameter of deformed bars and deformed bars number on the flexural behavior of the member are analyzed.Purely bending elements can be separated into 3 phases under load:the elastic phase,the elastoplastic phase and the strengthening phase.The specimens were all damaged by bending and showed fine ductility.Combined members can work well together under bending moments.Increasing the yield strength of the steel and the wall thickness of the steel tube has the most noticeable improvements in the load carrying capacity of the component.It is recommended to configure the number rebar roots in the range of 6 to 8 is optimal.
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