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Intensity measures for the seismic response prediction of base-isolated buildings

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Abstract

Base isolation has become a widely applied technique for protecting buildings located in highly seismic areas. Due to the strongly non-linear constitutive behaviour typical of many isolation devices, the seismic response of base-isolated buildings is usually evaluated through non-linear dynamic analysis. In this type of analysis a suitable set of ground motions is needed for representing the earthquake loads and for exciting the structural model. Many methods can be found in the literature for defining the ground motions. When natural accelerograms are used, the methods mainly differ from each other based on the intensity measures used for scaling the records to the defined earthquake intensity level. Investigations have been carried out for evaluating the predictive capability of the intensity measures used in these methods: while many studies focused on ordinary buildings, only a few focused on base-isolated ones. The objective of this paper is to evaluate the most commonly used intensity measures, which are currently available in the literature, with respect to their capability to predict the seismic response of base-isolated buildings. Selected for the investigation are two frame structures characterized by a different number of storeys and base-isolated with systems having different properties. Two sets of accelerograms, consisting of ordinary and pulse-like near-fault records, are used in the analyses and in the evaluation of the intensity measures. Modified versions of existing intensity measures are also proposed, with the intent of improving the correlations between the considered intensity measures and response quantities.

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Abbreviations

IM:

Intensity measure

EDP:

Engineering demand parameter

PGA:

Peak ground acceleration

AI:

Arias intensity

CAV:

Cumulative absolute velocity

\(\text{ I}_{\mathrm{a}}\) :

Compound acc.-related IM

\(\text{ I}_{\mathrm{c}}\) :

Characteristic intensity

PGV:

Peak ground velocity

FI:

Fajfar intensity

\(\text{ I}_{\mathrm{v}}\) :

Compound vel.-related IM

CAD:

Cumulative absolute displacement

IV:

Incremental velocity

SED:

Specific energy density

PGD:

Peak ground displacement

\(\text{ I}_{\mathrm{d}}\) :

Compound disp.-related IM

ID:

Incremental displacement

\(\text{ S}_{\mathrm{a}}\) :

Spectral acceleration at isolation period

\(\text{ E}_{\mathrm{Ir}}\) :

Relative input energy at isolation period

\(\text{ E}_{\mathrm{Ia}}\) :

Absolute input energy at isolation period

ASI:

Acceleration spectrum intensity

VSI:

Velocity spectrum intensity

\(\text{ I}_{\mathrm{H}}\) :

Housner intensity

\(\text{ V}_{\mathrm{EIr}}\)SI:

Relative input equivalent velocity spectrum intensity

\(\text{ V}_{\mathrm{EIa}}\)SI:

Absolute input equivalent velocity spectrum intensity

MASI:

Modified ASI

MVSI:

Modified VSI

\(\text{ MI}_{\mathrm{H}}\) :

Modified \(\text{ I}_{\mathrm{H}}\)

\(\text{ MV}_{\mathrm{EIr}}\)SI:

Modified \(\text{ V}_{\mathrm{EIr}}{\mathrm{SI}}\)

\(\text{ MV}_{\mathrm{EIa}}\)SI:

Modified \(\text{ V}_{\mathrm{EIa}}{\mathrm{SI}}\)

MIDR:

Maximum inter-story drift ratio

MRDR:

Maximum roof drift ratio

MFA:

Maximum floor acceleration

MBD:

Maximum bearing displacement

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Acknowledgments

The financial support of both the Italian Ministry of the Instruction, University and Research (MIUR) and the Italian Network of University Laboratories of Seismic Engineering (ReLUIS) is gratefully acknowledged

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Authors and Affiliations

  1. Department of Structural and Geotechnical Engineering, Sapienza University of Rome, Via Gramsci 53, Rome, Italy

    Fabrizio Mollaioli, Andrea Lucchini, Yin Cheng & Giorgio Monti

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  1. Fabrizio Mollaioli
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  2. Andrea Lucchini
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  3. Yin Cheng
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  4. Giorgio Monti
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Correspondence to Andrea Lucchini.

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Mollaioli, F., Lucchini, A., Cheng, Y. et al. Intensity measures for the seismic response prediction of base-isolated buildings. Bull Earthquake Eng 11, 1841–1866 (2013). https://doi.org/10.1007/s10518-013-9431-x

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