Evaluation of seismic performance measures for MDOF RC structures subjected to simulated and real ground motions

Shaghayegh Karimzadeh,Aysegul Askan,Ahmet Yakut,G.L Golewski

doi:10.1051/matecconf/202032302003

Shaghayegh Karimzadeh, Aysegul Askan + Show 2 more

Open Access

https://doi.org/10.1051/matecconf/202032302003

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Abstract

Nonlinear time history analyses of structures require full time series of ground motion records. For regions with sparse seismic networks or potential large earthquakes, ground motion simulation has gained more attention in recent years. Simulated records are required to be generated using regional input dataset and then verified against existing recorded ground motions of past events. To use simulated ground motions in engineering applications, estimation of reliable seismic demand parameters is essential. In this study, the real and simulated records of the 2009 L’Aquila, Italy earthquake with (Mw=6.3) are investigated for their use in engineering practice. In the first step, misfits are evaluated for alternative seismological measures (peak values, duration and frequency as well as energy content of the time histories). Next, varying multi-degree-of-freedom reinforced concrete structures with different number of stories are selected. Numerical models of the structures are performed in the OpenSees platform. Seismic performance measures in terms of inter-story drift ratio for the selected structures are assessed through nonlinear time history analyses for both the real and simulated ground motions. Then, the misfits are estimated in terms of structural demand parameters. Results reveal a good fit between the seismological and engineering demand misfits for the selected ground motion simulation approaches.

Highlights

Seismic behavior of different types of structures is generally affected by alternative characteristics of ground motion records including amplitudes, durations, energy, and their frequency content
The simulated ground motions based on the Hybrid Integral Composite (HIC) and Stochastic Finite-Fault (SFF) approaches have been respectively validated by the studies of Ameri et al [16] and Ugurhan et al [17] against the real time histories of the 2009 L’Aquila earthquake
The investigated seismic performance measure is taken as the maximum inter-story drift ratio

Summary

Introduction

Seismic behavior of different types of structures is generally affected by alternative characteristics of ground motion records including amplitudes, durations, energy, and their frequency content. Recent studies reveal that the characteristics of input ground motions can affect engineering demand parameters Before their use in earthquake engineering, it seems necessary to examine the closeness of the seismological misfits to the ones obtained based on engineering demand parameters for the simulated and real ground motion datasets. As an initial trial in this study, the real and simulated records of the 2009 L’Aquila, Italy earthquake with a moment magnitude of 6.3 are evaluated through the definition of logarithmic misfit. For this purpose, the simulated records of two alternative simulation approaches (i.e.: Stochastic and Hybrid) are considered [13]. Structural logarithmic misfits are calculated in terms of the selected structural parameter (maximum inter-story drift ratio)

Input ground motion records

Selected MDOF frame structures

Simulation results in terms of logarithmic misfits

Conclusions