Bending Steel Components Under Cyclic Loading Nonlinear Bending And Torsion Related Buckling

Steel Structures are widely used in the construction especially the high-riseand Super high-rise buildings due to its excellent anti seismic behavior.However local damage (even collapse)to the steel structure will be found whenit is struck by strong earthquake. Owing to a lack of the knowledge of damagemechanism of the steel structure under seismic loading. the current designcriterion and technical measures are not efficient enough to protect thestructures from being damaged by earthquake. So the analyses of responses ofdamage mechanism of steel structures under low cyclic loading are not only oftheoretical significance but also of practical impohance.Consdering the requirement of a large sum of money and the hard-to-getuniversal laws due to the limited amount of samples, the numericai modelmethod for calculations and analyses are efficiently used by the researchers andscholars in the world. The numerical model method includes a precise numeric-al model and the constitutive relations for materials. Based on the basic theoryof non linear finite element, the author of the paper set up the double non linearfinite element equation based on the updated Lagrange (U.L)for mutations forthe 8-node degenerate shell element and considering the nonlinear of geometryand the nonlinear of materials. And establish the nonlinear finite elementanalysis program based on the mixed strengthened constitutive relations and totest the correctness or the calculation method and the program by utilizing theachievements described in the related documents published both at home andabroad.Calculations are mad in the mper eq to analpo the liysteresisboteristics of the eccentric cmpsstOn to memere of the HseCtio.ACCorfor tD the calculaon results, tha ~ Of the witwckneS ratiOS,the heglItWs ratiOs, the aha cOInPreSSion and the hapelendemeSSratiOs of the ShatUr membo Unfor cyclic foeq on the OUeqlanebe charateristics of the eccentri comPmesion tu memers areanH secOnmp daty Of the twt law of lOadin&defOnntw bySwtccurv, Wtws ratios, Ws ratios, ahal cMsion ratiosand 1engthlendems ratio8 of the StrUtUre meInbers unde cyclic foadin onfiewtwt W behavfor are for ds calculatons onfleXndwt buckling behavior of HSectin comPrssfon Sharmembe unde cyclic lOadin are made SySWly.The fleedwiOnai bUdeing struture rnembe to keeP stead enthelyUnde cyclic loading and the lied vaiues of widthdsthess ratios,hepes ratiOs, ndal cOInPrssion and length-slendemss ratioi of thetheture memers to meet the -- Of duchIity and ~' of POstbuckling at differen earthpe intwes are SUggsted..Stuar conlusion arenot in the mp bo tha it is avatbole tortwe fOr the revisions on anti-e-- contents in the currnt regUlations.ffe PaPer i8 helPAn tO the deien eds on botriionai bucklingchacteritic8 of the bUckling steel strUctUre meboers unfor cyclic lOadin.