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Faramarz Khoshnudian,Danoush Motamedi 대한토목학회 2013 KSCE JOURNAL OF CIVIL ENGINEERING Vol.17 No.6
The concept of isolated structure is to separate the structure from harmful effects of earthquakes by introducing bearing. Regarding earthquakes such as the Bam and Kobe records with relatively high vertical component amplitude, it is necessary to investigate the behavior of the base-isolated structures considering vertical component of the ground motions. For this purpose, a four-story building with different eccentricities supported on elastomeric isolators with different vibration periods and damping ratios as well as three different records is used to study the effects of vertical component of earthquakes on the seismic behavior of asymmetric steel isolated structures. A rubber isolator element is used to idealize the nonlinear behavior of the isolators and a linear elastic behavior is assumed for the superstructure. The results demonstrate the significant effect of the vertical component of earthquake on the responses of structure such as axial forces, local uplift of the columns, and overturning moment of the structure and shear force of beams. For the studied cases including vertical component of earthquakes increases the compressive axial force (more than 100%) in corner columns. In addition the vertical component of earthquake causes significantly augmentation of tensile axial force and therefore, it results local uplift phenomena in isolators. Ignoring the vertical component of earthquake with high vertical amplitude will result unacceptable estimation in beam shear force and for some cases this error reaches 100%. This error is more important while the eccentricity of structure is significant (30%). Overturning safety factor is reduced when the vertical component of earthquake was included and this effect is more significant under earthquakes with higher ratio of vertical to horizontal component of earthquake.
Feedback Control of Linear-Quadratic-Integration Including Time-Delay System
Faramarz Asharif,Shiro Tamaki,Tsutomu Nagado,Tomokazu Nagata,Mohd Rashid,Mohammadreza Asharif 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
The aim of our research in this paper is to modify the system which includes Time-delay elements including closed loop system (feedback system). Time-delay will be happened during the long distance communication. Therefore, when we have a control object in a long distance, the transmitted reference signal will be delayed certainly. For this reason even though we assume the control object system is a stable system, but it will be an unstable system by time-delay elements. So, here we consider about the LQI (Linear Quadratic Integration) method including time-delay elements and finally, we analysis LQI results and its output behaviors.
Faramarz Moodi,Aliakbar Ramezanianpour,Ehsan Jahangiri 사단법인 한국계산역학회 2014 Computers and Concrete, An International Journal Vol.13 No.1
Chloride ion ingress is one of the major problems that affect the durability of concrete structures such as bridge decks, concrete pavements, and other structures exposed to harsh saline environments. Therefore, durability based design of concrete structures in severe condition has gained great significance in recent decades and various mathematical models for estimating the service life of rein-forced concrete have been proposed. In spite of comprehensive researches on the corrosion of rein-forced concrete, there are still various controversial concepts in quantitation of durability parameters such as chloride diffusion coefficient and surface chloride content. Effect of environment conditions on the durability of concrete structures is one of the most important issues. Hence, regional investigations are necessary for durability based design and evaluation of the models. Persian Gulf is one of the most aggressive regions of the world because of elevated temperature and humidity as well as high content of chloride ions in seawater. The aim of this study is evaluation of some parameters of durability of RC structures in marine environment from viewpoint of corrosion initiation. For this purpose, some experiments were carried out on the real RC structures and in laboratory. The result showed that various uncertainties in parameters of durability were existed.
Faramarz Fereshteh-Saniee,S. Hassan Nourbakhsh,S. Mahmoud Pezeshki 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.1
This paper is concerned with application of artificial neural network (ANN) to the ring compression test for simultaneous determination of the flow curve of the material and the friction factor. The developed ANN model was trained using data from 700 finiteelement (FE) simulations of the ring test. The load curve of this test and the final internal diameter of the sample are the inputs for this ANN model and the outputs are the strength coefficient, strain hardening exponent and the friction factor. It was found that the outputs of the developed ANN model were in good agreement with the experimental results.
Faramarz Hossein-Babaei,Won-Kyu Park 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.1
The configuration of the main components and the physical structure of the Taguchi sensor, the first ceramic gas sensor mass produced, has remained virtually unaltered since its appearance 40 years ago. This device owns an excellent combination of the quality factors but is non-selective. The research efforts carried out to enhance the selectivity in this resistive gas sensor are briefly reviewed. A novel design, capillary-attached gas sensor (CGS), is introduced, which employs the same ceramic components used for the fabrication of a classical Taguchi sensor but in altered geometries. CGS presents remarkable advantages from the view point of selectivity over the original design. While the steady state response of a CGS has the same significance as that of the Taguchi sensor, its transient response presents valuable diagnostic information. Fabrication and test of a prototype CGS is reported.
Faramarz Moodi 사단법인 한국계산역학회 2010 Computers and Concrete, An International Journal Vol.7 No.3
Managing and reusing knowledge in engineering and construction sectors can lead to greater competitive advantage, improved designs, and more effective management of constructed facilities. The use of Information Technology (IT) in design and construction can exploit strategic opportunities for new ways of integration, sharing and facilitating information and knowledge in any field of engineering. The integrating of separate areas of IT can be used to bring a group of experts and specialists in any field of engineering closer together by allowing them to communicate and exchange information and expertise that facilitate knowledge capture, sharing, and reuse. A lack of an advisory management system and a need to marshal all available data in a common format has indicated the need for an integrated engineering computing environment to investigate concrete repair problems. The research described in this paper is based upon an evaluation management system (EMS) which comprising a database management system (REPCON) alongside visualisation technologies and evaluation system (ECON) is developed to produce an innovative platform which will facilitate and encourage the development of knowledge in educational,evolution and evaluation modes of concrete repair. This allows us to create assessment procedures that will allow the current condition of the concrete structure and its components to be expressed numerically using a confidence level (CL) so as to take the best course of action in the repair and maintenance management. The explained rating system, which is related to structural integrity and serviceability of the structure, allows the confidence level to be determined by visual inspection and the descriptive information and pictures taken from an available REPair of CONcrete (REPCON) database.
FINITE TIME BLOW-UP SOLUTION FOR A CLASS OF NONLINEAR HYPERBOLIC EQUATIONS
Faramarz Tahamtani,Somayyeh Mohammadi 한국전산응용수학회 2010 Journal of applied mathematics & informatics Vol.28 No.1
In this work, We consider an initial boundary value problem for a class of nonlinear hyperbolic equations. We establish a blow-up result for certain solutions with a dissipative term.
FINITE TIME BLOW-UP SOLUTION FOR A CLASS OF NONLINEAR HYPERBOLIC EQUATIONS
Tahamtani, Faramarz,Mohammadi, Somayyeh The Korean Society for Computational and Applied M 2010 Journal of applied mathematics & informatics Vol.28 No.1
In this work, We consider an initial boundary value problem for a class of nonlinear hyperbolic equations. We establish a blow-up result for certain solutions with a dissipative term.