دانلود رایگان مقاله لاتین بهینه سازی بدنه کولیدی از سایت الزویر
عنوان فارسی مقاله:
روش جدید برای تعدیل حرکات زمین با استفاده از تبدیل موجک و بهینه سازی بدن کولیدی پیشرفته
عنوان انگلیسی مقاله:
A new method for modification of ground motions using wavelet transform and enhanced colliding bodies optimization
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Recent aseismic code regulations recommend the use of linear or non-linear dynamic time history analyses for design of irregular, high rise and important structures due to the increased capabilities of the commercial software to account the potential inelastic behavior of structural systems under seismic time histories. These acceleration time histories can be achieved either by using a set of real recorded earthquake accelerograms associated with historical seismic events, or utilizing an ensemble of numerically simulated earthquake signals. In the latter approach, one can make pure artifi- cial records and filter them according to the site characteristics or to reconstruct the real record so that its spectrum fits the target standard [1,2]. Obviously finding suitable methods for reconstructing or modifying realistic ground motions become important challenging problems. The main objective of the reconstruction/modification of ground motions is to modify a given recorded ground motions such that these response spectrums become compatible with a specified design spectrum. For this purpose, various time or frequencydomain methods are used. The time-domain methods manipulate only the amplitude of the recorded ground motions, while the frequency-domain approaches operate the frequency contents and phasing of actual ground motions in order to match with the design spectrum. During the last two decades a number of researches are performed on this problem employing the frequency-domain methods. Gupta and Joshi [3] and Shrikhande and Gupta [4] used the phase characteristics of recorded accelerograms. Conte and Peng [5] directly modeled the evolutionary power spectral density function of the ground motion process. Recently, many researchers have focused on modifying the recorded ground motions using wavelet [6–10]. For example, Hancock et al. [6] utilized wavelet and Mukherjee and Gupta [7] developed an iterative wavelet-based method for spectral matching. Cecini and Palmeri [8] proposed an iterative procedure based on the harmonic wavelet transform to match the target spectrum through deterministic corrections to a recorded accelerogram. As will be mentioned in the coming sections, these works achieved iterative approaches to obtain the sought spectrum-compatible accelerograms. These methods do not necessarily fulfill the requirements of the code regulations. In this paper an approach is utilized to modify the real ground motions such that these response spectrums become compatible with the European Code (CEN. Eurocode-8 [11]) for elastic spectrum regulations. For this purpose, the wavelet transform is used to decompose the ground motions to several levels and each level covering a special range of frequency, and each level is multiplied by a variable. Subsequently, an optimization algorithm is employed to calculate the variables to minimize the error between response and target spectrums, while the requirements of the code regulation are considered as constrains of the optimization process.
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کلمات کلیدی:
A new method for modification of ground motions using wavelet ... https://www.semanticscholar.org/...motions.../7885ef0f83e685aee0fd239c497e36d2ebd... Semantic Scholar extracted view of "A new method for modification of ground motions using wavelet transform and enhanced colliding bodies optimization" by A. Applications of Metaheuristic Optimization Algorithms in Civil ... https://books.google.com/books?isbn=331948012X A. Kaveh - 2016 - Mathematics 22. 23. 24. Kaveh A, Mahdavi VR (2016) A new method for modification of ground motions using wavelet transform and enhanced colliding bodies optimization. A new method for modification of ground motions using wavelet ... - خانه zoodyab.ir/.../114928-a-new-method-for-modification-of-ground-... Translate this page ... motions using wavelet transform and enhanced colliding bodies optimization ... proposed method is illustrated through modifying 12 sets of ground motions. Advances in Interdisciplinary Mathematical Research: Applications to ... https://books.google.com/books?isbn=1461463459 Bourama Toni - 2014 - Mathematics ... and the mechanism of their formation enhance one's appreciation of same: scattering by ... In the end, using the universal attraction to the beauty and “mystery” of ... the Dynamics of Collision and Near-Collision Motion in the N-Body Problem”, ... (ECOC) and attention detection using dual-tree complex wavelet transform. optimal ground motion scaling using enhanced swarm intelligence for ... civil.iust.ac.ir/ijoce/xmlgen.php?indx=hbis&mag_id=16 Enhanced colliding bodies optimization (ECBO) uses memory to save some best ... Identification using Wavelet Transform Optimized by Genetic Algorithm With ...
