Faculty of Civil and Geodetic Engineering, Ljubljana (FGGLJ)
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Pushover-based procedure for approximate simulation of system failure modes observed due to ground motions [Elektronski vir]Brozovič, Marko ; Dolšek, MatjažRandomness of ground motions causes variability of system failure modes of a structure. Other parameters, which affect the formation of the failure modes, are the ground-motion intensity and ... sensitivity of the structure to variation of system failure mode. All these factors make it difficult to anticipate a system failure mode for a given ground motion without performing nonlinear response history analysis. Consequently, pushover-based procedures often fail to predict system failure modes. Such inability of simplified procedures causes considerable error in predicted response. In order to solve this issue, an envelope-based pushover analysis procedure has been proposed, which assumes that each seismic response parameter is controlled by a predominant system failure mode, which may vary with respect to ground motion, its intensity and engineering demand parameter at a certain location in a structure. In the procedure it is assumed that the seismic demand associated with the first-mode pushover analysis is obtained by corresponding modal-based single-degree-offreedom model, while demands for %higher% failure modes are based on so-called failure-based single-degree-of freedom models. The total seismic demand is determined simply by enveloping the results based on several pushover analyses. Such approach enables approximate simulation of predominant system failure modes as function of ground motion and its intensity. By means of two reinforced concrete frame buildings and different sets of ground motions it is shown that the envelope-based pushover analysis procedure provides seismic demand for a given ground motion with a useful degree of accuracy. However, pushover analysis for invariant horizontal force distribution may not be always appropriate for predicting the most relevant system failure modes.Source: Frontiers of Earthquake Engineering [Elektronski vir] : 2014 EERI annual meeting , NEES Quake summit 2014 (Str. 1-10)Type of material - conference contribution ; adult, seriousPublish date - 2014Language - englishCOBISS.SI-ID - 6724705
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Brozovič, Marko | 31961 |
Dolšek, Matjaž | 18793 |
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