• Title/Summary/Keyword: Strength evaluation method

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A Study of Axial Eccentricity Strength of High Strength Concrete Thin Walls for Internet of Things (사물인터넷 구현을 위한 고강도 콘크리트 박막벽체의 극한 편심하중 강도에 관한 연구)

  • Oh, Soontaek;Lee, Dongjun;Kim, Yeonsik
    • Journal of Korea Society of Digital Industry and Information Management
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    • v.11 no.1
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    • pp.1-8
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    • 2015
  • Recently, a high strength concrete(HSC) in excess of 80 MPa is popular to use in the domestic construction field. But there is no design standard of high strength concrete. It is reason why a study about structural behaviors of thin walls is required. In this paper, the accurate Finite Element Method as a virtual test is suggested considering material properties, which are concrete and steel, and the experimental fractural model suggested by Kupfer. It is conducted the comparison evaluation of the ultimate failure loads, lateral-displacements and crack propagation patterns between the results of experimental approach, which were carried on Saheb's test for normal strength concrete and Lee's test for high strength concrete. Therefore it is suggested to use the accurate virtual simulation test method and Ubiquitous Sensor Network(USN) by Finite Element Method for Internet of Things(IoT).

Evaluation of Concrete Cone Breakout Strength of Expansion Anchors (익스팬션 앵커의 콘크리트 콘 파괴강도 평가)

  • Kim, Sung Yong;Kim, Kyu Suk
    • Journal of Korean Society of Steel Construction
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    • v.15 no.6 s.67
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    • pp.649-660
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    • 2003
  • The paper presents an evaluation of the tensile strength of the expansion anchor that can cause failure in the concrete based on the design of the anchorage. Tests of the heavy-duty anchor and the wedge anchor that are domestically manufactured and installed in plain concrete members are conducted to probe the effects of the embedded depth, concrete strength, and anchors spacing. The design of post-installed steel anchors is presented using the Concrete Capacity Design (CCD) approach. The CCD method is applied to predict the concrete failure load of the expansion anchor in plain concrete under monotonic loading for important applications. The concrete tension capacity of the fastenings with heavy-duty anchors and wedge anchors in plain concrete predicted using the CCD method is compared with the test results. For the CCD method, a normalization coefficient of 9.94 is appropriale for the nominal concrete breakout strength of an anchor or a group of wedge anchors in tension. On the other hand, a normalization coefficient of 11.50 is appropriate for the nominal concrete breakout strength of an anchor or a group of heavy-duty anchors in tension.

Shear Capacity Determination of Steel Fiber Reinforced RC Columns (강섬유 보강 RC 기둥의 전단능력 산정)

  • 이현호;장극관
    • Proceedings of the Korea Concrete Institute Conference
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    • 2001.11a
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    • pp.891-896
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    • 2001
  • As composite materials, the addition of steel fiber in concrete significantly improves the engineering properties of structural members, notably shear strength and ductility, In this study, shear capacity evaluation method according to steel fiber contents was proposed from the literature surveys and member tests. For this, previously proposed five shear strength equation were examined and evaluated by maximum shear strength and shear capacity ratio. From the parametric study and regression analysis, following conclusion can be made; the maximum shear strength of steel fiber reinforced column will be estimated by relative shear capacity ratio.

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Strength Evaluation of Reinforced Concrete Corbels using Nonlinear Strut-Tie Model Approach (비선형 스트럿-타이 모델 방법에 의한 철근콘크리트 코벨의 강도 평가)

  • 윤영묵;신용목
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.05a
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    • pp.391-396
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    • 2003
  • The concrete corbels consist of various failure mechanisms such as the yielding of the tension reinforcement, the crushing or splitting from compression concrete struts, and localized bearing or shearing failure under the loading plate. However, predicting those failure mechanisms is very difficult. In this study, the ACI 318-02, the softened strut-tie model approach, and the nonlinear strut-tie model approach are applied to ultimate strength analysis of normal strength concrete corbels tested to failure. From the result of the analysis, an effective analysis and design method of normal strength concrete corbels is suggested.

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Strength of Insulator FRP Rod According to the Winding of Glass Fiber (전기절연용 FRP의 와인딩 각도에 따른 강도특성)

  • 박효열;강동필
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.07a
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    • pp.586-588
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    • 2001
  • Inner part of FRP specimen was made unidirectionally by pultrusion method and outer part of FRP was made by filament winding method to study the effect of fiber orientatons on the strength of FRP. The strength of bending and compression was simulated and evaluated. The results of simulated strength and evaluated strength were different greately each other. The stress which affect the feature of FRP was simulated to investigate the difference of the results between simulation and evaluation Shear stresses were investigated to the main stress to affect the fracture of FRP.

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EXPERIMENTAL STUDY ON PROBABILITY OF STRENGTH FOR EPOXY ADHESIVE-BONDED METALS

  • Seo, Do-Won;Lim, Jae-Kyoo;Jeon, Yang-Bae;Yoon, Ho-Cheol
    • Proceedings of the KWS Conference
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    • 2002.10a
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    • pp.688-693
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    • 2002
  • Adhesive bonding is becoming one of the popular joining techniques in metal industries, since it has some advantages over other techniques such as welding and diffusion bonding, e.g., any dissimilar metals are easily adhesive-bonded together. In this study, the experiments were carried out in order to provide the statistical data with strength evaluation methods: tension, shear and four-point bending tests for thermoplastic epoxy resin based adhesive-bonded metal joints. We should certificate on the probability of the adhesive strength that has the tendency of brittle fracture, the adhesive bonding strength between metals with thermoplastic adhesive has the best probability at four-point bending test. The strength testing method that has higher probability is four-point bending test, shear test and tensile test in order.

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Statistical Estimation of Specified Concrete Strength by Applying Non-Destructive Test Data (비파괴시험 자료를 적용한 콘크리트 기준강도의 통계적 추정)

  • Paik, Inyeol
    • Journal of the Korean Society of Safety
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    • v.30 no.1
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    • pp.52-59
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    • 2015
  • The aim of the paper is to introduce the statistical definition of the specified compressive strength of the concrete to be used for safety evaluation of the existing structure in domestic practice and to present the practical method to obtain the specified strength by utilizing the non-destructive test data as well as the limited number of core test data. The statistical definition of the specified compressive strength of concrete in the design codes is reviewed and the consistent formulations to statistically estimate the specified strength for assessment are described. In order to prevent estimating an unrealistically small value of the specified strength due to limited number of data, it is proposed that the information from the non-destructive test data is combined to that of the minimum core test data. The the sample mean, standard deviation and total number of concrete test are obtained from combined test data. The proposed procedures are applied to an example test data composed of the artificial numerical values and the actual evaluation data collected from the bridge assessment reports. The calculation results show that the proposed statistical estimation procedures yield reasonable values of the specified strength for assessment by applying the non-destructive test data in addition to the limited number of core test data.

Development of the Buckling Strength Assessment System based on Offshore Structure Design Code (해양구조물 설계코드에 기반한 좌굴강도 평가 시스템 개발)

  • Kim, Ul-Nyeon
    • Special Issue of the Society of Naval Architects of Korea
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    • 2017.10a
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    • pp.38-45
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    • 2017
  • FPSO is widely used to develop deep sea oil fields and HHI has constructed ten(10) FPSOs. During these constructions, relevant structural design criteria such as yielding, buckling, fatigue, collision and impact strength were applied to verify structural safety. To apply the buckling strength evaluation for structures, the critical buckling stresses and applied stresses of relevant panels should be calculated. The plate and stiffened panels are to be idealized, which are needed much time and efforts by designers. Therefore, program development is necessary in order to evaluate the buckling strength conveniently and accurately. In this study, the buckling strength assessment system by using offshore code, DNV-RP-C201 was developed under MSC/PATRAN, pre-post program of finite element method. Graphic user interface program is written in MSC/PATRAN PCL functions. Source program to evaluate the buckling strength is developed in FORTRAN programming languages. The developed program is verified by comparing with the results of the Nauticus Hull developed by DNV Classification Society, and applied to the marine construction project conducted by Hyundai Heavy Industries LTD.

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The Study for Development on Earlier Evaluation Instrument of Strength of Concrete -Outline of Experiment and Investigation on Suitability of Instrument- (콘크리트 강도 조기 판정기의 개발에 관한 연구 (1) 실험 계획 및 실험기기의 적합성 검토)

  • 김화중;이도헌;윤상천;박정민
    • Proceedings of the Korea Concrete Institute Conference
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    • 1994.10a
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    • pp.435-440
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    • 1994
  • It is considered to pressing problem that the develpment of the rapid and simple method and measuring instrument, can evaluate for quality of concrete at early period. Accordingly in this paper proposed to earlier evaluation method on quality of concrete using resistance method and ultra-sonic pulse velocity test. It was found to the possibility of development on test method and instrument through a series of fundmental investigation.

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The Evaluation of Tube to Tubesheet Joint Part on Nuclear S/G (원자력 증기발생기 튜브/튜브시트 확관방법별 특성평가)

  • 심상한;배강국;김인수
    • Proceedings of the KWS Conference
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    • 1996.05a
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    • pp.34-37
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    • 1996
  • The expanding method of tube to tubesheet joint part on neclear steam generators are classified into three classes of roller expanding, explosive expanding and hydraulic expanding. After the expanded Mock-Up specimen are made by the three expanding method. The general properties, microstructure/microvickers hardness, pull-out strength, hydraulic leak pressure, of tube to tubesheet joint part were inspected. and We evaluated the operation efficiency of expansion, reproduction of expanded joint about three expanding method. Through the overall evaluation of tube to tubesheet joint part, The hydraukic expanding and explosive expanding could be certificated more useful expanding method.

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