The investigation of seismic performance of existing RC buildings with and without infill walls

Hakan Dilmac,Hakan Ulutas,Hamide Tekeli,Fuat Demir 사단법인 한국계산역학회 2018 Computers and Concrete, An International Journal Vol.22 No.5

One of the important factors is the infill walls in the change of the structural rigidity, ductility, dynamic and static characteristics of the structures. The infill walls are not generally included in numerical analysis of reinforced concrete (RC) structural system due to lack of suitable theory and the difficulty of calculating the recommended models. In seismic regions worldwide, the residential structures are generally RC buildings with infill wall. Therefore, understanding the contribution of the infill walls to seismic performance of buildings may have a vital importance. This paper investigates the effects of infill walls on seismic performance of the existing RC residential buildings by considering requirements of the Turkish Earthquake Code (TEC). Seismic performance levels of residential RC buildings with and without walls in high-hazard zones were determined according to the nonlinear procedure given in the code. Pushover curves were obtained by considering the effect of masonry infill walls on seismic performance of RC buildings. The analysis results showed that the infill walls beneficially effected to the rigidity, roof displacements and seismic performance of the building.

Application of continuous wavelet transform to detect damage in thin-walled beams coupled in bending and torsion

Hakan, Gokdag Techno-Press 2008 Structural Engineering and Mechanics, An Int'l Jou Vol.29 No.3

Robust Control of Current Controlled PWM Rectifiers Using Type-2 Fuzzy Neural Networks for Unity Power Factor Operation

Hakan Acikgoz,Resul Coteli,Mehmet Ustundag,Besir Dandil 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.2

AC-DC conversion is a necessary for the systems that require DC source. This conversion has been done via rectifiers based on controlled or uncontrolled semiconductor switches. Advances in the power electronics and microprocessor technologies allowed the use of Pulse Width Modulation (PWM) rectifiers. In this paper, dq-axis current and DC link voltage of three-phase PWM rectifier are controlled by using type-2 fuzzy neural network (T2FNN) controller. For this aim, a simulation model is built by MATLAB/Simulink software. The model is tested under three different operating conditions. The parameters of T2FNN is updated online by using back-propagation algorithm. The results obtained from both T2FNN and Proportional + Integral + Derivate (PID) controller are given for three operating conditions. The results show that three-phase PWM rectifier using T2FNN provides a superior performance under all operating conditions when compared with PID controller.

Free vibration of circular and annular membranes with varying density by the method of discrete singular convolution

Hakan Ersoy,Lutfiye Ozpolat,Omer Civalek 국제구조공학회 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.32 No.5

A numerical method is developed to investigate the effects of some geometric parameters and density variation on frequency characteristics of the circular and annular membranes with varying density. The discrete singular convolution method based on regularized Shannon’s delta kernel is applied to obtain the frequency parameter. The obtained results have been compared with the analytical and numerical results of other researchers, which showed well agreement.

Swedish Explorers, Missionaries and Collectors -The History of some Central Asian Collectors and their Collections in the National Museum of Ethnography, Stockholm

( Hakan Wahlquist ) 중앙아시아학회 2000 中央아시아硏究 Vol.5 No.-

Clairaut anti-invariant submersions from cosymplectic manifolds

Hakan Mete Tastan,Sibel Gerdan Aydin 호남수학회 2019 호남수학학술지 Vol.41 No.4

We investigate the new Clairaut conditions for anti-invariant submersions whose total manifolds are cosymplectic. In particular, we prove the fibers of a proper Clairaut Lagrangian submersion admitting horizontal Reeb vector field are one dimensional and classify such submersions. We also check the existence of the proper Clairaut anti-invariant submersions in the case of the Reeb vector field is vertical. Moreover, illustrative examples for both trivial and proper Clairaut anti-invariant submersions are given.

Differential quadrature method for frequency analysis of membranes having irregular domains using an eight-node curvilinear element

Hakan Ersoy,Lütfiye Özpolat,Ömer Civalek,Baki Öztürk 국제구조공학회 2009 Smart Structures and Systems, An International Jou Vol.5 No.5

Influence of openings of infill wall on seismic vulnerability of existing RC structures

Hakan Dilmaç 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.75 No.2

The contribution of infill wall is generally not considered in the structural analysis of reinforced concrete (RC) structures due to the lack of knowledge of the complex behavior of the infilled frame of RC structures. However, one of the significant factors affecting structural behavior and earthquake performance of RC structures is the infill wall. Considering structural and architectural features of RC structures, any infill wall may have openings with different amounts and aspect ratios. In the present study, the influence of infill walls with different opening rates on the structural behaviors and earthquake performance of existing RC structures were evaluated. Therefore, the change in the opening ratio in the infill wall has been investigated for monitoring the change in structural behavior and performance of the RC structures. The earthquake performance levels of existing RC structures with different structural properties were determined by detecting the damage levels of load-carrying components. The results of the analyzes indicate that the infill wall can completely change the distribution of column and beam damage level. It was observed that the openings in the walls had serious impact on the parameters affecting the behavior and earthquake performance of the RC structures. The infill walls have a beneficial effect on the earthquake performance of RC structures, provided they are placed regularly and there are appropriate openings rate throughout the RC structures and they do not cause structural irregularities.

The Role of Tendinitis in Fibromyalgia Syndrome

Hakan Gen?,Meryem Saraco?lu,Burcu Duyur,Hatice Rana Erdem 연세대학교의과대학 2003 Yonsei medical journal Vol.44 No.4

Fibromyalgia Syndrome (FS) is a common disease characterized by diffuse, widespread pain and multiple tender points. The syndrome has been subclassified as primary (PFS) and secondary (SFS) fibromyalgia. The aim of this study was to evaluate the role of common tendinitis (rotator cuff tendinitis, bicipital tendinitis, lateral epicondylitis, De-Quervain's tendinitis and pes anserinus tendinitis) in FS. Twenty female patients with PFS, 20 with SFS and 20 female controls, matched by age and body mass index, participated in the study. Existence of common tendinitis was evaluated with specific examination methods. Right and left rotator cuff tendinitis, pes anserinus tendinitis and left lateral epicondylitis were significantly more common in patients with PFS and SFS than in control subjects. As a result, considering the central hyperexcitability present in the fibromyalgia patients, concomitant pathologies such as tendinitis which lead to shoulder, arm, and leg pain must be evaluated. Follow up and therapy for the disease must be planned according to these factors which are not only probable symptoms of FS, but also leading causes for the occurence and continuity of the pain in this disease.

From Collective Selection to Individual Style: A Symbolic Transfer in Fashion

( Hakan Preiholt ) 한국마케팅과학회 2012 Journal of Global Fashion Marketing Vol.3 No.1

The paper aims to uncover the reasons why fashion appears in terms of collective selection in a movement towards individual style in the way people dress. Here, fashion is viewed in terms of collective fashion trends and personal style. Thus, it is the clothes, dressing habits, and garments that are observed in the research. The paper shows how the theory of symbolic interactionism can be used as an analytical tool to bring transparency to the movement from collective selection towards individual style in the fashion industry. This theoretical approach, which is connected to social interaction helps avoid the classical research trap of making statements through the study of cause and effect. The analysis is made based on examples of meanings created around the garment through an observation of the process from the initial meaning the person gives to as a symbol in social interaction, to the final stage when it becomes an individual style. There are four such phases that together create the final picture of why fashion is heading towards individual style. All these phases have different sources, and naturally provide different answers to the initial research question in this paper. Once the garment is turned into an individual style and, as customers seek more details in garments, there then occur a collapse of the "total look" towards hyper individuality. 1. The same garment may have different meanings for us depending on social interaction and symbol. When observing the same garments around the globe, they appear to have a common reality but this is not the case as these garments have different meanings. This reality is depicted in earlier studies such as Sapir (1999) that concludes that the main difficulty in understanding fashion and its apparent extravagances is the lack of exact knowledge of the unconscious symbolism of forms, colours, materials, postures and other elements that express a given culture. This difficulty is exacerbated by the fact that some expressive elements tend to have different symbolic references in different contexts. It is interesting to naote that current studies in fashion are in contradiction with such logic. 2. The same garment may have the same meaning depending on social interaction and symbol. When the same garment has the same meaning, such as a police uniform, it is straight- forward in communicating belongings, simply because the gar ment can be understood in exactly the same way by both parties. Lonnqvist (2008) is outspoken about power games in apparel communication with the assistance of garments. It is a matter of how one dresses and turns oneself out with different versions of clothing-from the warrior`s fearsome armour to the sexy and suggestive underwear. Power can be manifested in different ways, and clothing is among its more visible indicators. Clothes can radiate dominance and dignity, but also a sense of ridicule and humiliation thereby destroying their initial purpose of meaning. The question that arises then is, when can those garments become fashion if by definition the latter is a matter of a desire to keep up with times and to express the tastes that are emerging in a changing world? 3. Different garments may have different meanings depending on social interaction and symbol. A communication problem arises when different garments have different meanings in fashion. This problem highlights the structure of fashion design as well as pricing in the world. There is perhaps no other business sector like fashion, in terms of the correlation between a certain design and garments with price. The price criterion cuts across market criteria in the structural segmentation of the fashion industry. According to Saviolo and Testa, (2002) there are five price categories: couture, ready-to-wear, diffusion, bridge, and mass. A garment designed on the upper level in terms of price might differ radically from the design of a garment on the mass production level. 4. Different garments may have the same meaning depending on social interaction and symbol. When different garments have the same meaning in terms of status, income levels, gender, etc. department stores and "shops-in-shop" are frequently used together with branding to introduce these different garments with the same meaning to target groups on the market. Department stores are consequently the appropriate venues created to enable the introduction of these particular garments and deal with the particular situation they engender. Miller (1981) studied such a case in detail, focusing on Le Bon Marche in Paris. The latter refers to a large fashion department store and its place in fashion history. By allowing interactions with the society in which it is situated, and reflecting the changes that occur in that society, the department store becomes the living mirror of that society. The department store thus achieves a communicative role by using the living environment as a legitimizing justification of their very existence. As such, the department store as a display of fashion and witness of its historical change, typifies symbolic interactionism at work. This conceptual banter anchored in a symbolic interactionism framework that underlies this study has revealed four significant aspects that arise out of the movement from collective selection towards individual style in fashion: 1) When the same garment can have different meanings, it can create individualities depending on time, place and the role of the designer. 2) When the same garment has the same meaning as in the case of uniforms, then it can be used as a manifest for power. In certain circumstances these garments can move from being a symbol of power to become a symbol to communicate fashion indicating changes in the society as whole. 3) When different garments have different meanings, the price practice becomes a communication tool towards the consumers. The subsequent brand extension habits of fashion firms through stretching, collaborating, etc. confuses consumers who responsively become more individualistic in their choice of garments including mixing brands. This situation sometimes generates a hyper personalized fashion. 4) Where different garments have the same meanings to the consumers, the place or the store achieves a significant role in the marketing communication of fashion.