• Title/Summary/Keyword: concrete object

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A Study on the Effects of Curing Temperature for Compressive Strength of High Performance Concrete (양생온도 변화가 고성능 콘크리트의 압축강도에 미치는 영향에 관한 연구)

  • Ro, In-Cheul
    • Journal of the Korea Institute of Building Construction
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    • v.2 no.4
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    • pp.163-168
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    • 2002
  • The object of this study is to define the characteristics of high performance concrete with varing compressive strength of concrete and curing temperature. The major test variables are 1) high strength concrete(500kg/$cm^2$) and ordinary strength concrete(240kg/$cm^2$) compressive strength, 2) curing temperature and condition, 3) concrete curing age, 4) three types of cement. From the test results were shown that curing temperature and curing conditions were also very effective for high strength concrete and ordinary strength concrete, and concrete were largely effected by cement type and temperature during the hydration reaction process. This paper describes the effect of curing temperature for strength and characteristics of high performance concrete.

Dynamic Analysis of Plate Girder Bridge Using Object-Oriented Technique (객체지향기법을 이용한 플레이트 거더교의 동해석)

  • Cho, Jeong-Rae;Kwark, Jong-Won;Chin, Won-Jong;Choi, Eun-Suk;Kang, Jae-Yoon;Lee, Jung-Woo
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.05a
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    • pp.486-489
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    • 2006
  • This paper presents a newly proposed object-oriented finite element framework and its applications on dynamic analysis of plate girder bridge. The developed framework supports various types of finite elements, materials, constraints, loads, and solution methods. One major feature different from other object-oriented finite element programs is that static model and dynamic state can be easily read from or written to a file. In addition, the framework supports efficient DOF pattern handling for a node connecting elements with different DOF patterns, new multi-point constraint handling, and various scripting languages for easy use of the library. In order to show the applicability to dynamic analysis, dynamic moving load analysis on plate girder bridge is performed.

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A Study on the Effect of Corrosion Inhibitors for Concrete Permeability (방식재료가 콘크리트의 투수성에 미치는 영향에 관한 연구)

  • 이상엽;한만엽;이차돈;엄주용
    • Proceedings of the Korea Concrete Institute Conference
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    • 1997.04a
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    • pp.241-247
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    • 1997
  • Reinforced concrete is in general known as high durability construction material under normal enviroments due to strong alkalinity of cement. Marine and harbour concrete as well as concrete mixed with seasand for fine aggregate are exposed to detrimental saltwater wich cause to accel-eate corrosion of reinforcing steel in concrete. If corrosion resistance of concrete gets to weaken due to carbonation and crack in cover concrete, concrete durability rapidly decrease by corrosion of reinforcement steel embedded in concrete. This research is to investigate basic physical properties of various corrosion inhibitors and to evaluate their corrosion resistance in concrete mixed with seasand. The object of this study is develop appropriate corrosion protection systems so as to enhance the durability of concrete.

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A Study on the Object-Oriented Methodology on the Basis of Design Patterns (설계패턴을 이용한 객체지향 방법론에 관한 연구)

  • Kim, Chi-Su;Im, Gyeong-Mi;Gwon, Min-Ju
    • The Transactions of the Korea Information Processing Society
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    • v.6 no.6
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    • pp.1556-1562
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    • 1999
  • The various kinds of object-oriented methodology were provided for the development of flexible software. However, they do not automatically make the reusable and robust Object-Oriented software systems. The Object-Oriented mechanism is simply used as the means to obtain the aim. We have heard many complaints from the developers that methods did not give concrete design guidance. Methodologists' effort and make reusable information in the design phase. The relation between the Object-Oriented methods and the design patterns is mutually complementary, and they play a role as a valuable design guidance in the development of the Object-Oriented system. This paper show the interaction between OMT which is most well-known in the Object-Oriented Methodology and Facade, Mediator and Observer designed by Gamma. We suggest the clear solution for concrete design knowledge and reusability of them by applying design patterns to Object-Oriented Methodology.

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Computer Aided Design of RC Structures

  • Islam, S.M. Shahidul;Khennane, A.
    • International Journal of Concrete Structures and Materials
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    • v.7 no.2
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    • pp.127-133
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    • 2013
  • After reviewing the background and motivations for using modern computational methods for the design of reinforced concrete structures, an algorithm making use of the object oriented programming language Python and professionally developed finite element software is presented for the sizing and placement of the reinforcement in RC structures. The developed method is then used to design the reinforcement of a deep beam. To validate the design, two identical deep beam specimens were manufactured with the obtained steel, and then tested in the laboratory. It was found that the experimental results corroborated those predicted with the finite element design method.

Study on the Relationships of Bending Moment-Corvature Based on Bond Property (부착특성을 고려한 휨모멘트-곡률 관계에 관한 연구)

  • 장일영
    • Proceedings of the Korea Concrete Institute Conference
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    • 1991.04a
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    • pp.81-85
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    • 1991
  • The object of this study is to propose the bending moment-curvature relationships based on the bond properties between concrete and steel for noncraking zone, and evaluate the flexural displacement of reinforced concrete members. The bond-slip relationship and the strain hardening effect of steel were taken into account in order to evaluate the spacing of the cracks and the curvature distribution. Calculated curvature distribution along the longitudinal axis was transformed into equivalent curvature distribution. The flexural displacement was calculated by means of double intergral of the equivalent curvature. Calculated values are in good agreement with the experimental data.

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A Study on the Material Properties and Durabilities of Epoxy-Type Repairing Materials (에폭시계 보수재료의 재료특성 및 내구성능 분석)

  • 김도겸;이장화;박승범
    • Proceedings of the Korea Concrete Institute Conference
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    • 1997.10a
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    • pp.659-664
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    • 1997
  • RC structures can deteriorate for many defective factors. In the repair and retrofit works of concrete, epoxy resins are widely used as repair materials. The object of this study is to investigate the material properties and durabilities of epoxy resins which are commonly used in repairing concrete. The material properties such as line-expansion modulus, viscosity, microstructure and physical parameter as well as the durabilities such as gravity change, tensile strength, elongation change were carried out.

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Evaluation of Durability on the Repair Materials of Concrete Structures (철근이 부식된 콘크리트구조물용 보수재료의 내구성능 평가)

  • 문한영;이창수;김성수;김홍삼;곽도연
    • Proceedings of the Korea Concrete Institute Conference
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    • 1998.10b
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    • pp.857-860
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    • 1998
  • Reinforced concrete structure is deteriorated, as time goes on. So many repair materials are developed for the repair. But repair materials have not been adequately applied so far. Because the datum which evaluated the repair materials are not sufficient. The object of this study is estimation f repair materials that is in general use and establish method of application. To acquire the result, we have made experiments on chemical attack, carbonation and chloride permeability test. The carbonation and chloride permeability are very different. Some repair materials are poorer than portland cement mortar.

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A Case Study on Retarded Hardening of concrete Used Imported Cement (외국산시멘트 사용 콘크리트의 경화불량 원인에 대한 사례연구)

  • 이양수;김남호;김원기;정재동
    • Proceedings of the Korea Concrete Institute Conference
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    • 1992.04a
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    • pp.23-28
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    • 1992
  • In recent years, due to the construction boom the demand of cement is increasing suddenly and the use of imported cement is inevitable. But, because the quality of imported cement varies quite a lot, many problems have been encountered in construction fields. These problems include hardening retardation, lower early strength and crack of concrete. The object of this study is to explain causes for hardening retardation from a construction field case and propose a solution

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The Estimation of Surface Temperature of Concrete Frame Caused by Fire (구체콘크리트면에 받는 열온도의 시뮬레이션 실험)

  • Nakagawa. Muneo;Kei. Yanagi
    • Proceedings of the Korea Concrete Institute Conference
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    • 1997.04a
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    • pp.272-277
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    • 1997
  • The object of this paper is to analyze the surface temperature of RC structures caused by fire. The experimental analysis is undertaken by using following two methods. 1) Simulation to analyze the relationship between the temperature and the condition change for glass wool caused by fire. 2) Temperature-analysis (TG/DTA tests) of RC structures. From the results of the two experimental analysis, it was possible to estimate the temperature of RC concrete structures caused by fire.

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