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http://dx.doi.org/10.12989/eas.2018.14.2.155

Evaluation of N2 method for damage estimation of MDOF systems  

Yaghmaei-Sabegh, Saman (Department of Civil Engineering, University of Tabriz)
Zafarvand, Sadaf (Department of Civil Engineering, University of Tabriz)
Makaremi, Sahar (Department of Civil Engineering, University of Tabriz)
Publication Information
Earthquakes and Structures / v.14, no.2, 2018 , pp. 155-165 More about this Journal
Abstract
Methods based on nonlinear static analysis as simple tools could be used for the seismic analysis and assessment of structures. In the present study, capability of the N2 method as a well-known nonlinear analysis procedure examines for the estimation of the damage index of multi-storey reinforced concrete frames. In the implemented framework, equivalent single-degree-of-freedom (SDOF) models are utilized for the global damage estimation of multi-degree-of-freedom (MDOF) systems. This method does not require high computational analysis and subsequently decreases the required time of seismic design and assessment process. To develop the methodology, RC frames with period range from 0.4 to 2.0 s under 40 records are studied. The effectiveness of proposed technique is evaluated through numerical study under near- and far-field earthquake ground motions. Finally, the results of developed models are compared with two other simplified schemes along with nonlinear time history analysis results of multi-storey frames. To improve the accuracy of damage estimation, a modified relation is presented based on the N2 method results for near- and far-field earthquakes.
Keywords
damage index; equivalent SDOF system; MDOF system; N2 method; near and far-field records;
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