000020106 001__ 20106
000020106 005__ 20170118182355.0
000020106 04107 $$aeng
000020106 046__ $$k2017-01-09
000020106 100__ $$aRamí­rez, Carlos
000020106 24500 $$aEffects of Successive Earthquakes on Seismic Response of Reinforced Concrete Buildings in El Salvador

000020106 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000020106 260__ $$b
000020106 506__ $$arestricted
000020106 520__ $$2eng$$aThe effects of successive earthquakes in the response of RC moment-resisting frame systems for low ductility (intermediate moment frames) and high ductility (special moment frames) levels commonly designed in El Salvador is assessed in the present document. The outcome of the research may have great impact on the Response Modification Factor (R), Displacement Amplification Factor (Cd) and Allowable Drift (Δa), currently defined on the current national building code for seismic design in El Salvador, which still considers a single event as basis for the design of new structures. Three strong ground motion records from El Salvador are used, one near-fault source and two far-field source; with such input 15 sequences of one, two and three successive earthquakes are generated. Two sets of building are studied: a low ductility (1, 2, 3 and 4 stories) group and a high ductility (3, 6, 9 and 12 stories) group, 1353 analysis have been performed in total. The methodology comprised both nonlinear static analysis (static pushover) and incremental nonlinear dynamic analysis (dynamic pushover) for each model and earthquake sequence. Performance criteria at elements (local failure) and global failures are evaluated in all models. No damage evaluation in elements and torsion effects are considered. The results indicate that the Response Modification Factor “R” decreases as the number of records in the sequences of events increases, highlighting the importance of considering more than one event in its definition; additionally, for short periods (<0.43 sec.) the Response Modification Factor “R” is closely related to the elastic period of the buildings. The Displacement Amplification Factor “Cd” does not show significant variation by increasing the number of records in the sequence; however, it is observed this factor is linked to the elastic period of the building, which is opposed to the recommendations established on the current national building code of El Salvador. In addition, it has been found that low ductility buildings are being designed for greater forces than required, while high ductility buildings are being designed for lower forces than the ones recommended on the current national building code. Finally, results suggest the Displacement Amplification Factor found on the current Code is not conservative for buildings with periods longer than 1.0 sec whilst the Allowable Drift is considered conservative in all cases.

000020106 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000020106 653__ $$asuccessive earthquakes; response modification factor; incremental nonlinear dynamic analysis, allowable drift

000020106 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000020106 720__ $$aRamí­rez, Carlos$$iLópez, Manuel$$iPaz, Jaime Hernández De
000020106 8560_ $$ffischerc@itam.cas.cz
000020106 8564_ $$s1537968$$uhttps://invenio.itam.cas.cz/record/20106/files/572.pdf$$yOriginal version of the author's contribution as presented on USB, paper 572.
000020106 962__ $$r16048
000020106 980__ $$aPAPER