• Title, Summary, Keyword: reinforced concrete structure

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Consideration on the Risk of Corrosion Assessment in Reinforced Concrete Structure by Corrosion Potential Criterion (부식전위 기준에 의한 철근콘크리트 구조물의 부식진단의 위험성에 관한 고찰)

  • Jeong, Jin-A
    • Corrosion Science and Technology
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    • v.14 no.3
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    • pp.147-152
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    • 2015
  • Corrosion of steel reinforcement is a major factor in the deterioration of harbour and bridge structure. Steel corrosion in concrete must be checked for assessing the condition of a reinforced concrete structure. There are several ways how to measure the corrosion condition of reinforced concrete, but the corrosion potential measurement is a very simple, rapid, cost-effective and non-destructive technique to evaluate the severity of corrosion in reinforced concrete structure, therefore commonly used by engineers. However some particular situations may not relate to the reinforcement corrosion probability and a simple comparison of the corrosion potential data with the ASTM C876 Standard on steel reinforcement corrosion probability could be meaningless and not give reliable informations because of environment factors as oxygen concentration, chloride content, concrete resistance. Therefore this paper explains the risk of corrosion assessment in reinforced concrete structure and how many factors can affect the reliability of the corrosion potential data.

An Experimental Study on Steel Bar Corrosion of Reinforced Concrete Structure (철근콘크리트 구조물의 철근부식에 관한 실험 연구)

  • Chae, Young-Suk;Choi, Il-Yoon;Min, In-Ki
    • Journal of the Korean Society of Safety
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    • v.28 no.6
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    • pp.29-35
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    • 2013
  • The purpose of this study is to investigate the steel bar corrosion and degree of reinforced concrete bridge, and analyze the cause of corrosion occurrence. Therefore they could ensure the durability and stability as to suggest the corrosion prevention of reinforced concrete structure. To study the corrosion state reinforced concrete structure, We investigate the cover of concrete, the compressive strength by schmidt hammer, the neutralization test of site, the compressive strength of core and the measurement of neutralized depth. As the results of test, the corrosion-grade of reinforced concrete structure which the degree of corrosion is 3, 4 degree get to 18% in the used time of 40 years and the time elapsed of 25 years. Therefore the corrosion of steel bar give rise to public discussion. The degree of corrosion is serious, and the neutralization come to the cover of concrete.

An Experimental Study on the Strength Characteristics of Fiber-Reinforced Concrete Beam (섬유보강 철근콘크리트 보의 강도특성에 관한 실험적 연구)

  • Kim, Jeong-Sup;Park, Young-Bae
    • Journal of the Korea Institute of Building Construction
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    • v.3 no.1
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    • pp.85-91
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    • 2003
  • This study aims to provide basic data that can be applied to construct real structures. For this, an experimental structure was manufactured to identify durability according to age of fiber-reinforced concrete which contains fiber reinforcement materials (polypropylene fiber, steel fiber, cellulose fiber) and structural property about flexural behavior and destruction of reinforced concrete beam, and a relation between load and deflection, crack and destruction according to increase of load and ductility capacity was examined. Fiber-reinforced concrete materials and other constructional materials were experimented and the result is presented as follows: The results obtained through material test of concrete and static experiment of members usings 1. The experiment shows that compressive strength of fiber-reinforced concrete was lower than that of non-reinforced concrete. 2. As a result of strength experiment according to different kinds of fiber, compressive strength of an experimented structure that contains cellulose fiber was the highest when age was 28. 3. When deflection of reinforced concrete beam was examined, it was reported that ductility capacity of the experimented structure that contains fiber-reinforced concrete was raise than that of non-reinforced concrete.

Literature Study on the Durability Design Method of Reinforced Concrete Structure (철근콘크리트 구조물의 내구성 설계수법에 관한 문헌적 연구)

  • 신성우;이한승
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.421-426
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    • 1999
  • The purpose of this study is to investigate the durability design method of reinforced concrete structure in order to establish a rationally combined design system of structural and durability design, that is to say performance-based design. In literature study, the integrated design of concrete structure studied JCI committe is very intensive durability design method for reinforced concrete structure. Specially, B root durability design method for selection of verification level is very effective method in the view of modeling of materials and structural properties to analyze safety and serviceability of RC structures.

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Evaluation of Bond Strength of a Fire-Damaged Reinforced Concrete Structure (화재로 인해 손상 받은 철근콘크리트 구조물의 콘크리트 부착강도 평가)

  • 심종성;문도영;이정환
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.211-213
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    • 2003
  • Evaluation of bond strength of a fire-damaged reinforced concrete structure for determining whether to reuse, reinforced, or abandon the structure is very important. Recently, calculating method for changes in bond strength of rebars is proposed by C. Chiang. The equation is relating the ratio of residual bond strength, R, to temperature, T, and exposure time, t. This study presented and verified a general process for evaluating damage to bond strength of RC structure arising from high temperature.

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Numerical study of progressive collapse in reinforced concrete frames with FRP under column removal

  • Esfandiari, J.;Latifi, M.K.
    • Advances in concrete construction
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    • v.8 no.3
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    • pp.165-172
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    • 2019
  • Progressive collapse is one of the factors which if not predicted at the time of structure plan; its occurrence will lead to catastrophic damages. Through having a glance over important structures chronicles in the world, we will notice that the reason of their collapse is a minor damage in structure caused by an accident like a terrorist attack, smashing a vehicle, fire, gas explosion, construction flaws and its expanding. Progressive collapse includes expanding rudimentary rupture from one part to another which leads to total collapse of a structure or a major part it. This study examines the progressive collapse of a 5-story concrete building with three column eliminating scenarios, including the removal of the corner, side and middle columns with the ABAQUS software. Then the beams and the bottom of the concrete slab were reinforced by (reinforcement of carbon fiber reinforced polymer) FRP and then the structure was re-analyzed. The results of the analysis show that the reinforcement of carbon fiber reinforced polymer sheets is one of the effective ways to rehabilitate and reduce the progressive collapse in concrete structures.

Experimental and numerical analysis of RC structure with two leaf cavity wall subjected to shake table

  • Onat, Onur;Lourenco, Paulo B.;Kocak, Ali
    • Structural Engineering and Mechanics
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    • v.55 no.5
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    • pp.1037-1053
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    • 2015
  • This paper presents finite element (FE) based pushover analysis of a reinforced concrete structure with a two-leaf cavity wall (TLCW) to estimate the performance level of this structure. In addition to this, an unreinforced masonry (URM) model was selected for comparison. Simulations and analyses of these structures were performed using the DIANA FE program. The mentioned structures were selected as two storeys and two bays. The dimensions of the structures were scaled 1:1.5 according to the Cauchy Froude similitude law. A shake table experiment was implemented on the reinforced concrete structure with the two-leaf cavity wall (TLCW) at the National Civil Engineering Laboratory (LNEC) in Lisbon, Portugal. The model that simulates URM was not experimentally studied. This structure was modelled in the same manner as the TLCW. The purpose of this virtual model is to compare the respective performances. Two nonlinear analyses were performed and compared with the experimental test results. These analyses were carried out in two phases. The research addresses first the analysis of a structure with only reinforced concrete elements, and secondly the analysis of the same structure with reinforced concrete elements and infill walls. Both researches consider static loading and pushover analysis. The experimental pushover curve was plotted by the envelope of the experimental curve obtained on the basis of the shake table records. Crack patterns, failure modes and performance curves were plotted for both models. Finally, results were evaluated on the basis of the current regulation ASCE/SEI 41-06.

Repair and Strengthening of R/C Structure Using Glass Fiber Reinforced Plastic Thin Panels (유리섬유보강 박판패널에 의한 철근콘크리트 구조물의 보수.보강공법)

  • 천의균;진형장;박석암;김행준
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.866-873
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    • 2000
  • Reinforced concrete structure can be strengthened by glass fiber reinforced plastic thin panels. The GFRP-Thin Panels are manufactured by pressing form and their application technique are similar to steel plates. The use of FGRP-Thin Panels presents several advantages. The advantages of this structural system are the case of application, the elimination of joint and corrosion at the epoxy-panel interface. This paper introduces the method of manufacturing about GFRP-Thin Panels, mechanical properties and the application of reinforced concrete structures.

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Structural Behavior of Composite Slab toNuclear Power Structure under Reversed Cyclic Loads (반복하중을 받는 원자력 구조물 합성 바닥판의 구조적 거동)

  • 김정혁;김강식;김우범;정하선;이광수;신성우
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.629-634
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    • 2000
  • Comparing with single structure constructed with reinforced concrete or steel, composite structures have a great advantage. However, in case of nuclear power structure, the application of a conventional single structure (reinforced concrete or steel structure) inflicts a heavy loss on a economical and constructive efficiency. But, the application of composite slab to nuclear power structure could compensate these deficiency. Therefore, in this study, the structural behavior of composite slab in nuclear power structure is observed to assure economical and constructive efficiency.

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Service-Life Prediction of Reinforced Concrete Structures under Corrosive Environment

  • Shimomura, Takumi
    • Corrosion Science and Technology
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    • v.4 no.5
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    • pp.171-177
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    • 2005
  • A comprehensive framework for numerical simulation of time-dependent performance change of reinforced concrete (RC) structures subjected to chloride attack is presented in this paper. The system is composed of simplified computational models for transport of moisture and chloride ions in concrete pore structure and crack, corrosion of reinforcement in concrete and mechanical behavior of RC member with reinforcement corrosion. Service-life of RC structures under various conditions is calculated.