• Title/Summary/Keyword: structural evaluation

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Validity Evaluation of Determination Methods of Effective Concrete Strut Strength (콘크리트 스트럿 유효강도 결정방법의 적합성 평가)

  • 윤영묵
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.11a
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    • pp.595-599
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    • 2003
  • For implementation of the strut-tie model approach to the practical analysis and design of structural concrete, the effective strengths of concrete struts in a strut-tie model, which have a crucial effect on the determination of strut and tie forces and the validity verification of strut-tie model's geometric compatibility condition, have to be determined accurately. In this study, the validity of the methods for determining the effective strengths of concrete struts was evaluated by conducting the strut-tie model analyses of the three reinforced concrete deep beams tested to failure with the effective strengths of concrete struts obtained from the suggested determination methods.

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Structural Behavior of Polymer Concrete Bos Girders (폴리머콘크리트 박스 거어더의 구조적 거동)

  • 연규석;김광우;이윤수;김성순
    • Proceedings of the Korea Concrete Institute Conference
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    • 1993.10a
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    • pp.213-219
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    • 1993
  • The box girder was developed using polymer concrete, box girder were made for flexural behavior evaluation. The box girder was reinforced with reinforcing steel bars and fiber glass roving cloths. Failure loads were 13.5 tons and 16.6tons for steel reinforced girder and fiber glass reinforced girder, respectively. Especially for the fiber glass reinforced girder, the shape was not changed even after failure. It is expected that application of this idea will be useful for developing under ground box, girder, utility tunnel, small stream bridge box, etc.

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A Study on the Fatigue Crack Propagation of Partly Heat Treated Medium Carbon Alloy Steel (부분 열처리한 기계 구조용 합금강의 피로균열 전파에 관한 연구)

  • 이억섭;김선용
    • Journal of the Korean Society of Safety
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    • v.12 no.1
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    • pp.3-8
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    • 1997
  • It is well known that mechanisms of fracture and fatigue crack propagation depend upon various characteristics such as environmental condition, crack geometry, heat treatment and mechanical properties. It seems to be important for the detailed evaluation of structural components which contain flaws. In this paper, it is studied that the fatigue crack propagation of partly heat treated medium carbon alloy steel(SCM440) by high frequency heat treatment.

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Direct Evaluation of the Maximum and Limit States of Inelastic Structures Under Step Loads

  • Lee, Sang-Ho-
    • Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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    • 1992.08a
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    • pp.146-149
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    • 1992
  • The dynamic inelastic analysis is now often performed for the safe structural design against the seismic events or explosions. Several powerful methods of dynamic inelastic analysis such as direct intergration methods and modal superposition methods were developed with the development of computers during the last three decades. This type of analysis generally adopts the step-by-step time-integration procedure and gives a complete time history of the evolution of the structure.(omitted)

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A Study on the Evaluation Methods of the Load-Carrying Capacity of PSC I Type Girder Considering Material Nonlinear (재료 비선형을 고려한 PSC I형 거더교의 내하력평가 기법에 관한 고찰)

  • 심종성;김규선;문도영;주민관
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.05a
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    • pp.187-192
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    • 2003
  • Nowadays, It has adapted both Ultimate Strength Design(USD) and Allowable Stress Design(ASD) Method evaluating load-carrying capacity of PSC I Type Girder Bridge. But it has confused because the each method has brought some different results. This study shows some results of loading test of the PSC I type Girder Bridge and analyzed the structural behavior by FEM analysis considering material nonlinear. Parametric study of effective prestress of post tendon is performed and compared to results of loading test.

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City Development Strategy of Stuttgart / Germany:Analysis and Evaluation (독일쉬투트가르트시의 도시발전략과 평가 - 한국 도시발전전략에 대한 시사점 -)

  • 김한규
    • Journal of the Korean Regional Science Association
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    • v.12 no.2
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    • pp.117-127
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    • 1996
  • The purpose of this paper is to explain and to evaluate the city development strategy of Stuttgart/Germany. Otherwise this paper deals with the transformation possibility of Stuttgart model to city of Taegu. In recent times Stuttgart has invested great effort to innovate her structural problems. Important points are as follows; Planning of development strategy for future, Innovation of infrastructure and city image, Effort for environment, participation programs for citizens etc. Coooperation between Stuttgart and Taegu will bring some synergy effect in the future.

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Effect of Initial Tension on Natural Periods for a Suspension Bridge (현수교 초기장력이 고유주기 산정에 미치는 영향)

  • 김호경;이재홍
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2003.05a
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    • pp.450-454
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    • 2003
  • Natural periods are usually determined by the so-called linearized finite displacement theory even for a suspension bridge. This linearized method, with formulating structural stiffness by taking dead-load tension into consideration, calculates the natural periods of the bridge. As a result, the assumed initial tensions for each cable member may affect the accuracy of calculated natural periods and some other dynamic responses. This paper mainly demonstrates the effect of initially introduced tension accuracy on the evaluation of dynamic characteristics for a suspension bridge.

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A Study on the Quality Evaluation of Permament form (비탈형 영구거푸집의 품질평가에 관한 연구)

  • 김형남;김우재;김성식;김영희;정상진
    • Proceedings of the Korea Concrete Institute Conference
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    • 1998.10b
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    • pp.900-905
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    • 1998
  • This study is about quality test of parmament form for practical application. Nowdays domestic building market in the face of 3D, in addition to construction cost increase, materials lack problems and opening a building market to foreign countries, is trying to find out the efficient ways of overcoming these problems. So the efficiacy of form work to technical improvement will contribute a practical permanent form in field through quality test of permmament form. In this paper, we examined the total system of form erections and evaluated the structural permament of columns and beams.

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A Study on the Evaluation for In-Service Material Degradation of High Temperature Structural Components by Grain Boundary Etching Method (입계부식법에 의한 플랜트용 고온기기의 경연재질열화 평가에 관한 연구)

  • 김정기;윤재영;송기욱;이주진;정세희
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.15 no.3
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    • pp.898-906
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    • 1991
  • 본 연구에서는 입경부식법에 의한 재질열화 평가법의 표준화에 연구목적을 두 고, 고온부재의 열화에 따른 조직의 특성변화를 관찰하였다.