Abstract
The nonlinear structural analysis is considered as a basic design procedure, which is used for checking of the structural robustness in accidental design situation. It is explained by following reason: a nonlinear structural analysis based on realistic constitutive relations for basic variables (average values) makes possible a simulation of a real structural behavior. It should be pointed that, implementation of the nonlinear structural analysis in design of concrete structures requires an alternate approach to safety verification. The paper presents a new approach to safety format for nonlinear analysis of RC structures subjected to accidental loads. DOI: http://dx.doi.org/10.5755/j01.sace.22.1.20194
Highlights
Nonlinear analysis is most widely used as a main computational tool for checking of robustness of the structural systems in accidental design situations (Accidental Limit States Checking). As it was stated in Červenka (2013a), “evaluations of the nonlinear analysis are supported by rapid increase of computational power as well as new capabilities of the available tools for numerical simulations of structural performance”
The first published works dealing with nonlinear finite element analysis of concrete systems emerged in the late 1960
Schlune concluded that model uncertainties of nonlinear analysis are much higher than in standard design based on engineering formulas and are strongly dependent on modes of failure and adopted failure criteria
Summary
Is the stiffness matrix that can be established by assembling the contributions of all the concrete yers and transverse sheAasr sitifwfnaesss.shown above, nonlinear analysis take into account the nonlinear deformation properown above, nonlineartieasnaolyfsRisCt-askeecitniotonsac, cboausnet dthoennponhlyinseiacraldcefoonrmstaittiuotnivperorpeelarttiieosnosf (R“ óC-− å ” for material properties) and bpehhyasvicioalr.cIofnrsetfilteuctitvseamnreailnkatteeiogsnrasplo(r“seσsspi obnεles”ea,fowsrhimmeraeutealarliltailloopcnarolopsfeeracttiieroesn)asalinnsdttermruaacckttueasnradplothsbseeirbehlfaeovraeiosiitrm.reIufqlaurteiirofelnsects an integral response, where oach for safety verificaaltliolnoc(anol tse,etchtaiot ninspianrtteiarlascatfeatyndfacthtoerr(ePfSoFr)emitetrheoqdu(iErNes1a99n0:ad20e0q6u)awtee approach for safety verification probabilities of separ(antoe tme,atehraiatlsin, bpuatrdtioalnsoat feevtaylufaatcetothre(PfaSilFu)remperothbaobdili(tEyNon19th9e0:st2ru0c0t6ur)awl e assume a failure probabilities ereusnidstearnlicneed(Č, tehravtennoknaoli2fn0es1ae3rpbaa)n.raaIlnytesaiscmcoofarftdeerasrnicaaelvsew,riibtfhiuctaČtdieoornvenonofktgaleo(v2ba0a1llu3raebst),iesttthahenecteefraamnildugrrleeoqbpuairlroersbesaaibsstaialfinetcytyeon the structural level) It should used for “assessmentboef ustnrudceturrlainl ereds,pothnaset onnohnilginheerasrtraucntaulryalsilsevoelfftehrasn aa cvroesrsi-fisceacttiioonn”.oTfheglobal resistance and requires a ance is introduced insaČfertvyenfokram(2a0t13fobr) ignloobrdaelrrteosdisistatinngcueis(hČtehrevennewklay 2in0t1ro3dbu)c.eIdn cahcecokrodfance with Červenka (2013b), the level, as compared EN 1990 (2006). As it was shown above, the ECOV-method is based on idea that the random distribution of resistance, which is again described by the coefficient variagawelloqyhb.siaic(shl7t)rhi.esesAaivsgsataaliiuntnecwdeoeafasstnchrtrtsdeiiaehobgiogsennlwlpdooeVobnbdbnRaay,aflslrbctesrohaoeamesvonfieefsctb,tfoytaoehtenhlffelceaefoeicsswctEtftioiaeriCmrncunsOtgtcaofVtvtroeuear-qr rdmaiupRaelfastrtwiestohouiyaoonmdssdnoVtd:em-iRessm,fteiacbn)aat.aeinnscIdnebRrdienetmhsoeapiansscotncinicomddsareedacsa.taheenadt,chrceafaortwcoettmifhetfihercmiis(reSeatnainycntdkRoovRmrakmarviaaltuioenssoof freressisistatannccee(pVsRecuadnob-setaotbices of resistance (pseudo-static response of can be obtained from following equation: the structural system). The set of the test results obtained in experimental investigations of the different types of statically indeterminate structures demonstrates different failure mechanism (see Tables 2, 3) was Dimensions Size, mm Material properties
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