RESEARCH ON STATIC PERFORMANCE OF CABLE-BRACED FRAME FOR PRESTRESSED MULTIPLE AND HIGH-RISE STEEL STRUCTURES

A new type of prestressed cable-braced energy-dissipation frame structure was proposed by adding prestressed cable brace to a high-rise building． This structure could improve lateral resistance and ductility of steel frame effectively，thus resulting in smaller calculation length of columns and less steel-consumption． By using finite element method，the static behavior of cable-braced rigid frame，cable-braced semi-rigid frame and steel frame was analyzed，and the influence law of axial compression ratio on their elastioplasticity behavior，ultimate bearing capacity，failure mechanism，lateral stiffness and ductility etc was studied． The results showed that cable brace could improve the lateral stiffness and bearing capacity of steel frame，more importantly，could also improve its lateral ductility，change failure model，and produce the self-centering function by tensioning frame back to the original location entirely or partly when the load was removed． In addition，with the increase of axial compression ratio， bearing capacities of the three type frames were all decreased，and the ductility of steel frame was also reduced． However，the ductility of cable-braced steel frame was not influenced by the axial compression ratio．