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| Avtorstvo: |
Vojko KILAR // 1.01 Izvirni znanstveni članek
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| Leto: |
1999 |
| Citat: |
KILAR, Vojko. Nonlinear dynamic and static analysis
and seismic behaviour of asymmetric buildings. Stroj. vestn., Poseb.
izd., 1999, str. 150-157, graf. prikazi. |
| Povzetek: |
V zadnjih letih se vse več
raziskovalcev ukvarja s preučevanjem obnašanja nesimetričnih konstrukcij (glede
na tlorisno razporeditev nosilnih elementov) pri močni potresni obtežbi. V
članku so predstavljeni rezultati dveh najpogostejših - in v osnovi zelo
različnih - računskih pristopov: nelinearne dinamične analize in nelinearne
statične analize. Kot testni primer je bila izbrana štiri-etažna
armiranobetonska okvirna stavba, ki je bila dimenzionirana po Evropskem
standardu Eurocode 8. Obravnavani sta bili simetrična in nesimetrična iste
stavbe. Uporabljenih je bilo pet akcelerogramov in dve različni normiranji.
Pomik na vrhu konstrukcije za nelinearno statično analizo je bil v vseh primerih
določen z nelinearno dinamično analizo (merjeno v centru mas). Primejališča
horizontalnih sil za nelinearno statično analizo so bila vzeta po predlogu, ki
ga vsebuje Eurocode 8 za poenostavljeno elastično analizo konstrukcij. V članku
so prikazani pomiki, prečne sile, torzijske rotacije, etažni premiki in faktorji
duktilnosti za robne okvire. Rezultati dobljeni na oba načina se dobro ujemajo,
kar potrjuje primernost uporabe nelinearne statične analize in upoštevanih
ekscentričnosti za potrebe simulacije odziva nesimetričnih konstrukcij pri
potresni obtežbi
Inelastic behaviour of plan asymmetric building
structures during strong ground motions have become a popular research topic in
the past few years. The paper quantitatively compares the results of two most
popular, however contradictory approaches: nonlinear dynamic analysis and
nonlinear static (usually called push-over) analysis. As a test example a
four-storey r/c frame building designed according to the European seismic code
provisions (Eurocode 8) was selected. The non-linear dynamic analysis results
for five different earthquake records (two scalings) for symetric and asymmetric
variant of the structure are presented and then compared with the push-over
analysis results. In all cases the push-over analyses were performed up to
themaximum top displacement obtained by the nonlinear dynamic analyses (measured
in center of masses). In order to match the edge displacements of the building,
the points of load application for pushover analysis were shifted according to
eccentricities that are proposed in Eurocode 8 for simplified analysis and
elastyic design of structures. The comparison of displacements, base shears,
deflection profiles, floor torsional rotations and storey drifts, as well as
ductility factors for X and Y direction frames, shows a very good correlation of
results and indicates that the push-over analysis and used eccentricities might
be appropriate for simulation of response of asymmetric structures [COBISS.SI-ID
757857]
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| Tipologija: |
1.01 Izvirni znanstveni članek |
| COBISS ID |
757857 Polni zapis iz sistema COBISS |
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Vpisal 2009/06/10 11:56
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