New insights into the relationship between seismic intensity measures and nonlinear structural response

Abstract This paper focuses on the probabilistic analysis of Intensity Measures ( IM s) and Engineering Demand Parameters EDP in context earthquake-induced ground motions. Several statistical properties, which are desirable s when they used to predict s, have been analysed. Specifically, efficiency, sufficiency steadfastness quantified for a set with respect two s: maximum inter-storey drift ratio, MIDR , floor acceleration, MFA . Steadfastness is new property proposed this article, related ability forecast large building suites. In other words, means that efficiency does not significantly vary different types buildings simultanously considered analyses. allows reducing number calculations performing seismic risk estimations at urban level since, instance, variety fragility curves, representing specific typologies, can be grouped together within more generic one. The main sources uncertainty involved calculation analysis. To do so, nonlinear dynamic responses multi-degree-of-freedom models, subjected data motion records, calculated. These models generated simulate behavior reinforced concrete whose stories from 3 13. 18 spectrum-, energy- direct-accelerogram-based herein. Then, clouds - points, quantified. For results show based spectral velocity efficient steadfast than ones acceleration; averaged range periods, AvSv has shown most an adequate steadfastness. acceleration-based- velocity-based ones. A comparison also presented use linear vs quadratic regression their implications derivation functions. Concerning sufficiency, analysed property. Nonetheless, multi-regression employed address lack allowing obtain so-called ‘ideal’