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Optimal vector-valued intensity measure for seismic collapse assessment of structures

Earthquake Engineering and Engineering Vibration 2015年第1期14卷 37-54页

作者： Masood Yakhchalian ahmad nicknam Gholamreza Ghodrati Amiri School of Civil Engineering Iran University of Science & Technology Center of Excellence for Fundamental Studies in Structural Engineering School of Civil Engineering Iran University of Science & Technology

The present study is aimed to investigate the ability of different intensity measures （IMs）, including response spectral acceleration at the fundamental period of the structure, Sa（T1）, as a common scalar IM and twelve vector-valued IMs for seismic collapse assessment of structures. The vector-valued IMs consist of two components, with S（T1） as the first component and different parameters that are ratios of scalar IMs, as well as the spectral shape proxies εSa and N, as the second component. After investigating the properties of an optimal IM, a new vector-valued IM that includes the ratio of Sa（T1） to the displacement spectrum intensity （DSI） as the second component is proposed. The new IM is more efficient than other IMs for predicting the collapse capacity of structures. It is also sufficient with respect to magnitude, source-to-site distance, and scale factor for collapse capacity prediction of structures. To satisfy the predictability criterion, a ground motion prediction equation （GMPE） is determined for Sa（T1）/DSI by using the existing GMPEs. Furthermore, an empirical equation is proposed for obtaining the correlation between the components of the proposed IM. The results of this study show that using the new vector-valued IM leads to a more reliable seismic collapse assessment of structures.

关键词： intensity measure efficiency sufficiency displacement spectrum intensity collapse capacity fragility surface

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Reproducing fling-step and forward directivity at near source site using of multi-objective particle swarm optimization and multi taper

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Earthquake Engineering and Engineering Vibration 2013年第4期12卷 529-540页

作者： A.nicknam A.Hosseini H.Hamidi Jamnani M.A.Barkhordari School of Civil Engineering Iran University of Science & Technology

This paper presents a technique to reproduce compatible seismogran3s involving permanent displacen3ent effects at sites close to the fault source. A multi-objective evolutionary algorithm is used to minimize the differences between the response spectra and multi-tapered power spectral delsilies corresponding to the recorded and simulated wavelbrms. The multi-taper method is used to reduce the spectral leakage that is inherent in the Fourier rams formed form ofwavelbrms, ieading to a reduction of variance in power spectral amplitudes, thus permitting the calibration of the two sets of data. The technique is implemented using the 1998-Fandoqa （lran） earthquake data and the results are compared with the actual observed data. Additionally, a comparison is made with a SAR interfcrometry study leading to fair agreement with the reported dislocation along the main fault. The simulation procedure and results are discussed and assessed concluding that, although the technique may be associated with uncertainties, it can still be used to reproduce wavelbnns at near source sites that include permanent dislocation, and can be used for seismic pertbrmance evaluation of structures in the region under study.

关键词： near-fault simulation fling step directivity multi-taper multi-objective algorithm MO-PSO

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维普期刊数据库

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