• Title, Summary, Keyword: structural characteristics

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Structural Analysis and Vibration Characteristics of Scaffolding Structures (비계 구조물의 구조해석 및 진동 특성)

  • Ryu, B.J.;Lee, C.R.;Kim, H.S.
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.19 no.5
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    • pp.491-498
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    • 2009
  • This paper deals with structural analysis and vibration characteristics of scaffolding structures with a hoist according to payloads. In order to analyze the vibrational and structural characteristics for 20-step scaffolding structure, structural and vibrational characteristics for 2-step scaffolding structure were compared with some experimental results. The numerical results for natural frequencies of scaffolding structures have a good agreement with experimental ones. Through the numerical analysis, firstly, it is shown that the maximum stress of scaffolding structures is lower than von-mises yield criteria when four persons with total weight of 280 kgf are working at the top of the scaffolding structures. Secondly, vibration characteristics including natural frequencies and modes for scaffolding structures are shown in case of various kinds of moving masses.

DB for the Structural Characteristics, Images and Sensibilities of Fabrics -Effects of the Structural Characteristics On the Texture Images of Woolen Fabrics- (의류소재의 물성이 소재의 이미지 및 감각 특성에 미치는 영향에 관한 DB구축(제1보) -방모 직물의 구조 특성에 따른 질감 이미지 분석-)

  • 고수경;유신정;김은애
    • Journal of the Korean Society of Clothing and Textiles
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    • v.27 no.5
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    • pp.533-544
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    • 2003
  • The purpose of this study was to provide practical information to design woolen fabrics in terms of structural and surface characteristics, which produce texture images of fabrics. The relationship among structural, surface characteristics and texture images, and preference and purchase intention were analyzed. To evaluate the texture images of the fabrics subjectively, 7 rank's semantic differential scale questionnaires were developed with thirty adjective pairs. Blind and non-blind test were performed with 320 female subjects who were in their 20-30's. Commercially available 48 woolen fabrics were used as specimens. Results showed that five factors were obtained: classic, elegance, warmth, natural and casual. These factors were closely related to fiber type, weave type, fabric counts, and finishes.

Structural Characteristics Analysis of Stone Contact Surface according to Surface Roughness and Filling Material of Stone Pagoda Structure (석탑구조물의 표면거칠기 및 충전재에 따른 석재접촉면의 구조특성 분석)

  • Kim, Ho-Soo;Kim, Dong-Kwan;Lee, Seung-Hee;Kim, Derk-Moon;Jo, Sang-Sun
    • Journal of the Architectural Institute of Korea Structure & Construction
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    • v.34 no.6
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    • pp.19-27
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    • 2018
  • The stone pagoda structure is treated as a discontinuous masonry structure, and the contact surface characteristics between stones is a very important factor in the discontinuum behavior analysis. So, it is necessary to find out material and structural characteristics of stone contact surface to perform the structural analysis for safety evaluation. Accordingly, it is important to analyze the material properties of stone surface and secure the structural characteristics through various contact surface states. Therefore, in this study, various test specimens applying the filler between the surface roughness and the stone in the contact surface treatment technique of the stone pagoda were manufactured, and compression test and shear test were carried out. Also, we analyzed the material and structural characteristics of the stone contact surface through the comparison of experimental results.

The Evaluation of Texture Image and Preference according to the Structural Characteristics of Silk Fabric (견직물의 구조적 특성에 따른 질감이미지와 선호도 평가)

  • Kim, Hee-Sook;Na, Mi-Hee
    • Korean Journal of Human Ecology
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    • v.18 no.1
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    • pp.137-143
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    • 2009
  • The purpose of this study is to examine the evaluation of texture image and preference according to the structural characteristics of silk fabric, and to analyze the effects of texture image and sensibility on the preference. 53 female subjects evaluated fabric image and sensibility of 17 specimens of white silk fabrics sold on the market with semantic differential scale. The data were analyzed through factor analysis, Pearson correlational coefficient and t-test using SPSS win 13.0. For the evaluation, structural characteristics such as fiber contents, weave type, weight and thickness were analyzed. Factor analysis showed that sensibilities were classified into 3 categories; 'surface property', 'weight', 'flexibility'. Fabric images were classified into 2 categories; 'elegance' and 'naturalness'. Statistically significant differences of structural characteristics on the texture image were observed. Weave type affected 'surface property' and fiber contents affected' flexibility'. Weight and weave type affected' elegance', too. The significant factors affecting preference were fabric image of 'elegance' and structural characteristics of 'weave type'. The results of this study showed that the most preferred silk fabric is smooth and soft satin weaved fabric with texture image of 'elegance'.

Determination of Non-ideal Structural Boundary Conditions by Using Spectral Element Method (스펙트럴요소법을 이용한 구조물의 비이상적인 경계조건 결정에 관한 연구)

  • 전덕규;김주홍;이우식
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.160-165
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    • 1997
  • Structural boundary condition is very important as a part of a structural system because it determines the dynamic characteristics of the structure. It is often to experience that experimental measurements of structural dynamic characteristics are somewhat different from the analytical predictions in which idealized boundary conditions are usually assumed. However, real structural boundary conditions are not so ideal; not perfectly clamped, for instance. Thus this paper introduces a new method to determine the non-ideal structural boundary conditions in the frequency domain. In this method, structural boundary conditions are modeled by both extensional (vertical) and torsional elastic springs. The effective springs are then determined from experimental FRFs (frequency response functions) by using the spectral element method (SEM). For a cantilevered beam experiments are conducted to determine the real boundary conditions in terms of effective springs. Dynamic characteristics (analytically predicted) based on identified boundary conditions are found to be much closer to experimental measurements when compared with those based on ideal boundary conditions.

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A Study on The Structural Systems of Modern Architecture and Architectural Characteristics (근대건축의 구조시스템과 건축적 특성에 관한 연구)

  • Cho, Sung-Hyun
    • Journal of The Korean Digital Architecture Interior Association
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    • v.10 no.1
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    • pp.49-56
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    • 2010
  • The purpose of this study is to examine the relationship between the structural system used in modern architecture and the form and spatial composition of the buildings. The principle in stabilization of structures is closely related to the architectural form. That is, in order to stabilize a building, a special type of structural system is required and consequently shows up with consistent characteristics in the architectural form. Modern architecture can be classified into skeleton structure, trusses structure, and space structure according to the structural characteristics. Skeleton structure is then divided into a perpendicular form and tapered form. Trusses structure is categorized as dome-shaped structure and slab-shaped structure, and space structure can be divided into compressible space structure and tensile space structure. When classifies the modern building with the aspect of architectural effect, there is a possibility of trying to divide with effect of production, and its expression. Effect of production mean structural system and effect of expression mean space and plan.

Measurements on the Characteristics of Dynamic and Vertical Vibration Transfer according to floors of Building Structures using Accelerometer and Dynamic signal analyzer (가속도계와 동적신호분석기를 이용한 건축물 바닥슬래브 동특성 및 수직진동 전달특성 측정)

  • Chun Ho-Min
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.29-34
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    • 2006
  • In general, the vertical vibration problems for .strength of members and serviceability of building structures are not considered in structural design process, but the prediction of the vertical vibration is very important and essential to structural design process. This study aims to investigate the characteristics of vertical vibration in terms of the transfer of horizontal directions on the rahmen building structures. In order to examine the characteristics of vertical vibration, the modal test and the impact (heel-drop and hammer) excitation experiments were conducted several times on three building structures. The results from the experiments are analyzed and compared. with the results. The results of this study suggest that the characteristics of vertical vibration transfer in horizontal way are effected from the fundamental frequency of the slabs and excitation forces.

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Structural Characteristic Analysis of a Centerless Grinding Machine with Concrete Bed (콘크리트 베드를 이용한 무심연삭기의 구조특성 해석)

  • 김석일;성하경
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.32-36
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    • 2002
  • This paper presents the structural characteristic analysis of a centerless grinding machine with concrete bed. The centerless grinding machine is composed of grinding wheel head, regulating wheel head, concrete bed, wheel dresser and so on. Especially, the concrete bed is introduced to improve the static, dynamic and thermal characteristics of the centerless grinding machine. The structural analysis model of centerless grinding machine is constructed by the finite element method, and the structural characteristics in the design stage are estimated based on the structural deformation and harmonic response under the various testing conditions related to gravity force and directional farces

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A Study on the Structural Behavior of Cable Domes (케이블 돔의 구조적 거동 특성에 관한 연구)

  • 한상을;윤종현;이승훈;진영상;황보석
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.151-158
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    • 2000
  • Cable dome that consists of three component such as cable, strut and fabric membrane has complex structural characteristics. Main structural system of cable dome is cable-strut tensegric system and fabric membrane element is conceived as cladding roof material. One of the important problem of cable dome is to investigate the structural response from external load effect such as snow and wind. When cable dome is subjected to load each structural component has various special structural characteristics. One is that geometrical nonlinearity should be considered because large deformation is occurred from their flexible characteristic. The other is that wrinkling occurs occasionally because cable and membrane elements can not transmit compressive forces. So this paper researches the physical structural response of cable dome structure and the structural behavior when failure occurred at a part of structure.

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Seismic performance and its favorable structural system of three-tower suspension bridge

  • Zhang, Xin-Jun;Fu, Guo-Ning
    • Structural Engineering and Mechanics
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    • v.50 no.2
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    • pp.215-229
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    • 2014
  • Due to the lack of effective longitudinal constraint for center tower, structural stiffness of three-tower suspension bridge becomes less than that of two-tower suspension bridge, and therefore it becomes more susceptible to the seismic action. By taking a three-tower suspension bridge-the Taizhou Highway Bridge over the Yangtze River with two main spans of 1080 m as example, structural dynamic characteristics and seismic performance of the bridge is investigated, and the effects of cable's sag to span ratio, structural stiffness of the center tower, and longitudinal constraint of the girder on seismic response of the bridge are also investigated, and the favorable structural system is discussed with respect to seismic performance. The results show that structural response under lateral seismic action is more remarkable, especially for the side towers, and therefore more attentions should be paid to the lateral seismic performance and also the side towers. Large cable's sag, flexible center tower and the longitudinal elastic cable between the center tower and the girder are favorable to improve structural seismic performance of long-span three-tower suspension bridges.