Study On Stressful And Torsional Behavior Of Concrete Filled Circular CFRP-steed Tube

Concrete filled steel tube structure is a kind of structure form that is composed of steel filled with concrete,which has some advantages such as high bearing capacity,good plastic and ductility performance,simple construction technology and high fire resistance.Concrete filled CFRP-steel tube is a new improvement based on Concrete filled steel tube structure which not only overcomes the defect that Concrete filled steel tube is easy to be corroded,but also plays the CFRP tube's advantages such as lighteness,tensile strength.The aims of this paper is to study on torsional behavior of concrete filled circular CFRP-steel tube subject to Stressful and torsion.The meaning of this study are as follows:In terms of research status,the study on Stressful and torsional behavior of concrete filled circular CFRP-steel tube is not complete.At present.This research is a perfection of this research structure;The research will be better able to guide engineering practice.The research takes advantage of the combination of test and simulation.The research contents of this paper are as follows:First make a primary research on Stressful and torsional behavior by the test of 8 concrete filled circular CFRP-steel tublar members;Second establish calculation model by using ABAQUS software and make whole process analysis and do parameter analysis;Last give this member's bearing capacity index of Stressful and torsion,then make a comparison between calculated results and test results to be sure that the calculation is resilable.results are as follows:1.Design a comparatively perfect test device,which has some advantages and do structiveness test by loading on Concrete filled CFRP-steel tube subject to pure twisting.Give out T-? curves,T-? curves by test measurement,then calculate T-? curves,and do analysis of specimen's failure model with different parameters,and verify the teamwork between steel tube and CFRP tube.2.Establish calculation mode and do analysis of the whole process for a typical example.Talk about stress analysis at a particular time,such as max principal stress and shear stress of concrete,Mises stress and shear stress of steel,the stress of CFRP.3.Change parameter,and then make a research on the influence on T-?curves with the changing of concrete strength,steel yield strength,steel ratio,the number of piles of the longitudinal CFRP and the transverse CFRP.4.After finite element analysis and MATLAB fitting,put forward bearing capacity index of concrete filled circular CFRP-steel tublar members.The calculated results agree well with the experimental results.the formula can be applied to engineering practice.