Based on the hypothesis of plane cross-section of average strain and numerical iterative method,the author compile the computer program .with this program,we can gain N-M and M _x — M _y interlated curves,and the program is proved right by some erperimentalresults,furthemore the program is fit for T, L, å cross-section. Through the program,the author compare ultimate strength of different loading plot, different steel shape , different limb-breadth rations, different limb-length rations, different concrete strength rate and different stress ration,and find these factors difference to ervery one.The autor summarize these influent rule of factors througth theoretical results.Finally the auther expound practical computer method to S.R.C special-shaped columns . |