• Journal of Korean Association for Spatial Structures
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• v.12 no.2
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• pp.109-118
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• 2012

Few paper deal with the dynamic bucking under the load with periodic characteristics, and the behavior under periodic excitation is expected the different behavior against STEP excitation. A space frame structure has high stiffness with a structure resisting external forces in steric conformation. According to many structural conditions, structural stability problems in the space frame are determined and considered very important. This study seeks to understand the space frame collapse mechanism using the 2-free nodes truss model in order to examine static structural instability characteristics of the latticed dome. According to geometrical shape, the star dome, parallel lamella dome and three way grid dome were selected as models. The models were examined for characteristics of instability behavior according to rise-span ratio(${\mu}$) and shape imperfection.

• Journal of Korean Association for Spatial Structures
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• v.8 no.2
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• pp.73-84
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• 2008

The various systems as the seismic resistance systems are used to reduce the seismic response of structure. And the seismic isolation system among them is the system that reduces the seismic vibration to be transmitted from foundation to upper structure. The purpose of isolation system is to lengthen the period of structure and make its period shift from the dominant period of earthquake. In this study, the seismic behavior of arch structure with lead rubber bearing(LRB) and friction pendulum system(FPS) is analyzed. The arch structure is the simplest structure and has the basic dynamic characteristics among large spatial structures. Also, Large spatial structures have large vertical response by horizontal seismic vibration, unlike seismic behavior of normal rahmen structures. When horizontal seismic load is applied to the large spatial structure with isolation systems, the horizontal acceleration response of the large spatial structure is reduced and the vertical seismic response is remarkably reduced.

• Journal of the Korea institute for structural maintenance and inspection
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• v.21 no.4
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• pp.116-123
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• 2017

This study has been investigated the applicability of auxetic mesh for the reinforcement of structural members. Typical materials including concrete behaves with positive poisson's ratio when external force is applied. In this study, it has been theoretically verified that metallic auxetic mesh restrains as such mechanical behaviors of concrete resulting in the stiffness increase. Also, regarding the applicability to construction field, a type of auxetic mesh has been suggested and the mechanical characteristics were numerically analyzed.

• Tunnel and Underground Space
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• v.22 no.6
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• pp.393-402
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• 2012

A behavior of ridge-cut rock slope had been monitored by installing inclinometers and regional slope movement toward rear side of cut face was detected. To delineate the governing factors of slope behavior, especially backward slip of ridge-cut slope, petrographic characteristics of rock cores obtained from four drilled boreholes had been examined. BIPS images inside boreholes had been acquired and structural characteristics of slope rock had been studied. Mechanical properties of discontinuity planes distributed in the drilled core had been measured and the shear strength of coal seam imbedded-discontinuity planes also had been obtained by performing the direct shear test. Monitoring results of slope behavior had been analyzed by comprehensibly considering both the mechanical and structural characteristics of slope rock and coal seam-imbedded discontinuity planes, and the potential governance of coal seam and clay minerals embedded in the joint plane on the regional slope behavior has been also identified.

• Proceedings of the Korea Concrete Institute Conference
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• 2009.05a
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• pp.73-74
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• 2009

Current buildings have complex shaped walls where the wing wall system is a popular option. When the wing wall is attached to a column, or a short span is produced due to the wing wall system, the system affects the behaviour of the column such as by increasing the strength and decreasing the ductility of the members. Calculations for internal shear force and internal bending moment of the vertical members are considered an important matter in design, but currently Korea does not have studies on the effects of the wing wall on the columns.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.26 no.2A
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• pp.273-284
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• 2006

In this study, After considering the general characteristic of Near Fault Ground Motion, the inelastic response spectrum is made to evaluate using the change of ductility and yield stiffness coefficient according to the inelastic behavior of structures which couldn't be examined through the elastic response spectrum. It is conducted to the elastic and inelastic time history analysis about the long period structure which could reflect the characteristic of Near Fault Ground Motion with the best and it is also examined the aspect of response distribution about the input data. Moreover, the response characteristic of structure is analyzed by investigating the plastic hinge for the purpose of grasp about the inelastic behavior of structure.

• Journal of the Korea institute for structural maintenance and inspection
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• v.7 no.3
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• pp.125-131
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• 2003

This paper presents the characteristics of flexural behavior of RC beam strengthened with CFRP(Carbon Fiber Reinforced Polymer Plate). Experimental variables included the strengthening length, width, reinforcement ratio, end anchorage and preloading corresponding to 75 percent of ultimate capacity and the effects according to each experimental variables were analyzed. To study, a total 21 RC beams were constructed, tested and the response of the beams in terms of ultimate load, deflection, strain of CFRP, failure mode were examined.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.19 no.2 s.72
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• pp.187-194
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• 2006

Generally, earthquake-resistant structural systems have to ensure the sufficient stiffness and ductility for stability In this paper, the spatial structures are applied an isolation system to boundary parts between roof systems and sub-structures. So, it is necessary to examine the characteristics of dynamic behaviors of spatial structures governed by higher modes rather than lower modes different from the cases of high-rise buildings. The objectives of this paper are to develop the equivalent lumped mass model to simplify an analytical processes and to investigate the dynamic behaviors of roof systems according to the mass and stiffness of sub-structures as a fundamental study of performance design for the spatial structures.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2011.04a
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• pp.61-62
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• 2011

비닐하우스는 매우 세장한 강관부재들을 교차 결합하여 조립한 철골 구조물의 한 종류이다. 현행 설계기준으로 단동 비닐하우스의 최대 구조성능은 풍하중 40m/s, 설하중 50cm에 달한다. 그러나 설계 단계에서는 부재들의 교차결합 특성 및 부재가 직접 지반에 삽입되는 기초의 특성이 적합하게 반영되지 않는 문제점이 있다. 따라서 가력시험을 통하여 반강접 특성을 갖는 부재 교차부 및 지반삽입기초 조건이 구조물의 거동에 미치는 영향을 분석하였다. 부재 교차부가 강접 조건일 경우와 비교하여 교차부가 반강접일 경우에는 재하지점의 수평강성이 최대 54% 작게 나타났으나 주변 교차절점들에서의 에너지 흡수로 인하여 재하지점과 수평으로 3m 떨어진 지점에서는 반대로 최대 39% 큰 값을 보였다. 지반삽입기초의 경우에는 고정조건과 비교하여 재하지점의 수평강성이 최대 32% 작게 나타났으며, 지점부에서는 기초 조건의 영향으로 최대 26%의 휨강성 증가 효과를 보였다. 부재 교차부와 기초 조건이 구조물의 정적거동에 미치는 영향을 확인하였으나 최대내력과 강성 산정을 통한 구조성능 평가 방법의 개발이 필요할 것으로 판단된다.

• Korean Journal of Materials Research
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• v.5 no.4
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• pp.483-489
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• 1995

Nd-(Fe, Co)-B합금에 Ni, Al, Ti등을 복합치환하여 그에 따른 산화거동과 자기적 성질의 변화를 조사하였다. 이들 리본의 산호거동은 parabolic한 거동을 나타내고 있으며, Ni 첨가시 매우 낮은 산화량을 나타내었다. 또한 산화된 리본은 Nd-rich상의 우선적 산화에 의해 표면에 요철이 관찰되었으며 Ni 첨가시 그러한 요철은 많이 줄어들었다. 표면의 산화층은 Nd산화물이었고, 이는 입계에 있는 Nd-rich상이 산화되고 이것이 확산 통로로 작용하였다고 생각된다. 산화가 진행됨에 따라 입계상에 의한 domain wall pinning이 약해져 자기특성이 저하하였다. 그러나 Ni 첨가시 이러한 산화거동이 크게 억제되었으며 Ni의 첨가는 Nd-rich상의 산화저항성을 증가시킴으로써 리본의 산화를 억제해 자기특성의 저하를 억제하였다.