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Ymittos Athens, Greece

Chrysostomou C.Z.,Cyprus University of Technology | Asteris P.G.,Computational Mechanics Laboratory
Engineering Structures | Year: 2012

The important contribution of infill walls in the resistance of earthquake loads is documented along with a presentation of the behavior modes of the infill and the bounding frame. Equations for quantifying the in-plane stiffness, strength and deformation capacity of infills are given as well as simplified methods for predicting the in-plane failure mode of mainly solid panels. A parametric study is performed to compare these methods and check them against experimental results whenever this was possible. Based on the above material, recommendations are made for the in-plane material properties, failure modes, strength and stiffness as well as deformation characteristics of infilled frames. © 2012 Elsevier Ltd. Source


Asteris P.G.,Computational Mechanics Laboratory | Cotsovos D.M.,Heriot - Watt University | Chrysostomou C.Z.,Cyprus University of Technology | Mohebkhah A.,University of Malayer | Al-Chaar G.K.,Research and Development Center
Engineering Structures | Year: 2013

The in-plane contribution of infill walls on the structural response of infilled frame structures is an important problem and many research initiatives, via experimental and numerical methods, have been conducted in order to investigate it thoroughly. As a result, the need to consider these research findings on the structural performance has been acknowledged in the latest generation of structural design codes. However, due to the uncertainties concerning the behavior of masonry at the material and structural level, these elements are usually ignored during practical structural analysis and design. They are overtly considered only when there is suspicion that their influence is detrimental to the overall structural response or to the behavior of individual load bearing elements or when it is necessary to justify an improvement in the overall load-carrying capacity or structural performance in general. In this paper, a thorough overview of the different micromodels proposed for the analysis of infilled frames is presented, and the advantages and disadvantages of each micromodel are pointed out (this paper follows our recent review paper on the state-of-the-art of the mathematical macromodeling of infilled frames, thus completing the overview of both macro- and micro- models in the field). Practical recommendations for the implementation of the different models are also presented. © 2013 Elsevier Ltd. Source


Asteris P.G.,Computational Mechanics Laboratory | Kakaletsis D.J.,Technological Educational Institute of Athens | Chrysostomou C.Z.,Cyprus University of Technology | Smyrou E.E.,National Technical University of Athens
Electronic Journal of Structural Engineering | Year: 2011

The main objective of this paper is to present a general classification scheme of the failure modes of in-filled frames, both with and without openings. For the former, the existing classification is summarized based on a literature review. For the latter, recent experimental results on frames in-filled with unreinforced masonry walls with openings and subjected to slowly applied cyclic lateral loads are used, and a number of different failure modes (crack patterns) of masonry in-filled frames are identified and classified into distinct categories. Such a classification of failure modes improves substantially the understanding of the earthquake resistant behaviour of in-filled frames and leads to better methodological approaches regarding their modelling, analysis and design. Source


Asteris P.G.,Computational Mechanics Laboratory | Antoniou S.T.,SeismoSoft Software Solutions for Earthquake Engineering | Sophianopoulos D.S.,University of Thessaly | Chrysostomou C.Z.,Cyprus University of Technology
Journal of Structural Engineering | Year: 2011

The primary objective of this paper is to present a general review of the different macromodels used for the analysis of infilled frames. A number of distinct approaches in the field of analysis of infilled frames since the mid-1950s have yielded several analytical models. These studies stressed that the numerical simulation of infilled frames is difficult and generally unreliable because of the very large number of parameters to be taken into account and the magnitude of the uncertainties associated with most of them. In this paper, the advantages and disadvantages of each macromodel are pointed out, and practical recommendations for the implementation of the different models are indicated. © 2011 American Society of Civil Engineers. Source


Raveendran T.,Indian Institute of Science | Roy D.,Computational Mechanics Laboratory | Vasu R.M.,Indian Institute of Science
Journal of the Franklin Institute | Year: 2014

We propose a novel form of nonlinear stochastic filtering based on an iterative evaluation of a Kalman-like gain matrix computed within a Monte Carlo scheme as suggested by the form of the parent equation of nonlinear filtering (Kushner-Stratonovich equation) and retains the simplicity of implementation of an ensemble Kalman filter (EnKF). The numerical results, presently obtained via EnKF-like simulations with or without a reduced-rank unscented transformation, clearly indicate remarkably superior filter convergence and accuracy vis-à-vis most available filtering schemes and eminent applicability of the methods to higher dimensional dynamic system identification problems of engineering interest. © 2013 The Franklin Institute. Source

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