| Because of its special advantage , concrete filled steel tube (CFT) structure has been used more and more widely in civil engineering . The study of CFT has been proceeded to improve the basic theory and principle in practise . So far , the study of CFT includes static performance , seismic performance and so on . In theory study and experimental research , the relation between steel tube and internal concrete is assumed to be complete bond and sometimes the action brought by bond-slippage is neglected .The experiment of square CFT short column is proceeded to study the action of bond state on axial capacity of square CFT short column . The result indicates that the bond state has little influence on the axial capacity and rigidity of square CFT short column . The broken state and stress of internal concrete of the columns in different bond state is similar .Using finite element software ANSYS , the model of square CFT short column considering bond state is established . Compared with the experimental result , the model is proved reasonable . Using this model , the study of shear performance of square CFT column is proceeded and the result indicates that the bond state has some influence on the shear performance of square CFT column . Using the method , two models of the frame made up of square CFT column and steel beam considering bond state are established and the result indicates that the bond state has little influence on static lateral performance of the frame . |
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