Seismic safety of low ductility structures used in Spain.

J. C. VIELMA; A. BARBAT; S. OLLER

BULLETIN OF EARTHQUAKE ENGINEERING

SPRINGER

Lugar: Berlin; Año: 2010 vol. 8 p. 135 - 155

1570-761X

The most important aspects of the design, seismic damage evaluation and safety assessment of structures with low ductility like waffle slabs buildings or flat beams framed buildings are examined in this work. These reinforced concrete structural typologies are the most used in Spain for new buildings but many seismic codes do not recommend them in seismic areas. Their expected seismic performance and safety are evaluated herein by means of incremental non linear structural analysis (pushover analysis) and incremental dynamic analysis which provides capacity curves allowing evaluating their seismic behavior. The seismic hazard is described by means of the reduced 5% damped elastic response spectrum of the Spanish seismic design code. The most important results of the study are the fragilitycurves calculated for the mentioned building types, which allow obtaining the probability ofdifferent damage states of the structures as well as damage probability matrices. The results,which show high vulnerability of the studied low ductility building classes, are comparedwith those corresponding to ductile framed structures.