Naslov
Envelope principle in multi-mode pushover procedure for RC buildings

Autori
Mihanović, Ante ; Balić, Ivan ; Trogrlić, Boris

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the 4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2013) & the 3rd South-East European Conference on Computational Mechanics (III SEECCM) / Papadrakakis, M. ; Papadopoulos, V. ; Plevris, V. - Kos : European Community on Computational Methods in Applied Sciences (ECCOMAS), 2013, 3162-3178

Skup
4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2013) & 3rd South-East European Conference on Computational Mechanics (III SEECCM)

Mjesto i datum
Kos, Grčka, 12.06.2013. - 14.06.2013

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Multi-mode pushover ; Target acceleration ; Envelope ; RC frames

Sažetak
Pushover method is a practical procedure for comprehensive nonlinear analysis of structures subjected to seismic action. Application of this method, in accordance with the Eurocode 8 rules and due to engineering simplicity, favours application utilizing the first mode. Aim of research presented in this paper was to find the influence of multimodal combinations in assessing the bearing capacity of reinforced concrete (RC) frames and walls. This paper presents a procedure in which the most extreme state is defined by the lowest ground acceler- ation caused by a predetermined shape of an elastic spectrum. Extreme bearing value is ob- tained by the envelope principle. Mode shapes and period sizes are determined on a linear elastic model while the limit state of the load bearing system is evaluated in a nonlinear state of structures. Results of the analysis show that influences of higher modes are significantly bigger and that the safety/reliability, indicated by criteria for the target displacement, in ac-cordance with Eurocode 8 (Annex B), is not achieved. Inclusion of higher modes, in some presented examples, decreases the limit ground acceleration by more than two times, which is significantly less favourable than the target displacement criteria.

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo

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