• Title/Summary/Keyword: 콘크리트 구조물의 내진 보강

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Seismic Retrofit of RC Exterior Beam-Column Joints Strengthened with CFRP (CFRP를 이용한 비내진 철근콘크리트 외부 보-기둥 접합부의 내진 보강)

  • Kim, Min;Lee, Ki-Hak;Lee, Jae-Hong;Woo, Sung-Woo;Lee, Jung-Weon
    • Journal of the Korea Concrete Institute
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    • v.18 no.6 s.96
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    • pp.729-736
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    • 2006
  • It has been shown that many Reinforced Concrete(RC) structures designed without seismic details have experienced brittle shear failures in the beam-column joint area and resulted in large permanent deformations and structural collapse. In this study, experimental investigations into the performance of exterior reinforced concrete beam-column joints strengthened with the carbon fiber-reinforced polymer(CFRP) under cyclic loading were presented. The CFRP has been applied by choosing different combinations and locations to determine the effective way to improve structural performances of joints. Eight beam-column joints were tested to investigate behaviors of each specimen under cyclic load and to compare performances of seismic retrofit. According to the experimental study, the retrofit strengthened with the CFRP provides significant improvements of flexural capacity and ductility of beam-column joints originally built without seismic details.

Seismic Performance Evaluation of Reinforced Concrete Frames Reinforced with Chevron Bracing System (역V형 가새로 보강된 RC 골조의 내진성능평가)

  • Ha, Heonjun;Oh, Keunyeong;Lee, Kangmin
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.22 no.1
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    • pp.13-22
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    • 2018
  • In this study, seismic performance of existing RC frames reinforced with steel chevron bracing systems was experimentally evaluated. For this purpose, the unreinforced base specimen and seismically reinforced specimens with steel chevron bracing systems were fabricated and tested. Both strength and stiffness of the reinforced specimens were targeted about 2-3 times larger than the base specimen. Test results showed that the stiffness, strength, and ductility of the reinforced specimens considerably improved than those of unreinforced base specimen. Therefore, the results from this study could offer the basic information on the developing design guideline for the seismic reinforcement of RC frames.

Seismic Retrofit of Old Reinforced Concrete Buildings (노후 RC 건물의 내진 보강)

  • Huynh, Chanh Trung;Park, Jong-Yeol;Kim, Jin-Koo
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2010.04a
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    • pp.150-153
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    • 2010
  • 본 논문에서는 비내진 설계된 철근콘크리트 골조로 이루어진 저층의 노후공동주택의 내진성능을 향상시키기 위한 구조물의 보강방법에 대해 연구하였다. 이를 위하여 비선형 정적 해석과 시간 이력 해석을 수행하여 추가되는 철골 모멘트골조와 가새의 내진보강 효과를 검증하였다. 해석결과에 따르면 $H150{\times}150{\times}6{\times}8$로 구성된 철골 모멘트골조는 탄성구간에서는 하중의 약 1%, 구조물이 항복한 이후, 최대 3.5%까지 하중을 부담하여 자체적으로 지진하중에 대한 저항 성능은 크지 않았다. 그러나 철골 모멘트골조와 가새를 동시에 사용함으로써 접합부의 조기 파괴를 방지하고 구조물의 내진성능을 큰 폭으로 증진시킬 수 있는 것으로 나타났다.

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A Development of Seismic Rehabilitation Method of RC Buildings Strengthened with X-Bracing Using Carbon Fiber Composite Cable (X-가새형 탄소섬유케이블을 이용한 중·저층 철근콘크리트 건물의 내진보강법 개발)

  • Lee, Kang-Seok
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.18 no.3
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    • pp.1-9
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    • 2014
  • Improving the earthquake resistance of buildings through seismic retrofitting using steel braces can result in brittle failure at the connection between the brace and the building, as well as buckling failure of the braces. In this study, a non-compression cross-bracing system using the Carbon Fiber Composite Cable (CFCC), which consists of CFCC bracing and bolt connection was proposed to replace the conventional steel bracing. This paper presented the seismic resistance of a reinforced concrete frame strengthened using CFCC X-bracing. Cyclic loading tests were carried out, and the maximum load carrying capacity and ductility were investigated, together with hysteresis of the lateral load-drift relations. Test results revealed that the CFCC X-bracing system installed RC frames enhanced markedly the strength capacity and no buckling failure of the bracing was observed.

New Technique on the Improvement of Earthquake-Resistant Performance for the Retrofitting of Existing Reinforced Concrete Beam-Column Joints (철근콘크리트 보-기둥 접합부의 내진성능 개선 보강 신기술)

  • 하기주
    • Journal of the Earthquake Engineering Society of Korea
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    • v.8 no.2
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    • pp.73-81
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    • 2004
  • In this study, experimental research was carried out to improve earthquake-resistant performance for the retrofitting of reinforced concrete beam-column joints using carbon fiber materials in existing reinforced concrete building. Six reinforced concrete beam-column joints were constructed and tested to evaluate the retrofitting effect of test variables, such as the retrofitting materials and retrofitting region(plastic hinge, beam-column joint) under load reversals. Test results show that retrofitting specimen(RPC-CP2, RPC-CR, RJC-CP, RJC-CR), using new materials(carbon fiber plate, carbon fiber rod and carbon fiber sheet), designed by the improvement of earthquake-resistant performance and ductility, attained more load-carrying capacity and stable hysteretic behavior.

Economic Analysis of a 5-Story RC OMRF Retrofitted with Modified Epoxy Mortar for Improving Seismic Performance (변성에폭시 모르터로 내진보강한 5층 철근콘크리트 보통모멘트골조의 경제성 분석)

  • Kang, Suk-Bong;Kwak, Jongman;Shin, Dongwoo;Son, Kiyoung
    • Journal of the Korea Institute of Building Construction
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    • v.14 no.3
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    • pp.207-215
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    • 2014
  • As a reinforcement material for RC members, the modified epoxy mortar has been reported one of the superior materials since the material can improve the load capacity and the seismic performance of the RC members. However, there were few experimental studies and analytical research for improving seismic performance with the material. This study is to propose an effective reinforcement plan for RC Ordinary Moment Resisting Frame (OMRF) with the evaluation of seismic performance and economic analysis. For the objective, first, the load-deflection curve of a simple beam specimen was compared with the analytical results. Second, a 5-story RC OMRF structure was designed only for gravity load and the alternatives for seismic reinforcement were suggested. Third, pushover analysis was executed for evaluation of design coefficients and seismic performance of the structures. Finally, an effective reinforcement plan was suggested based on the results of quantity take-off and economic analysis. The findings of this study can be utilized as the basic data when the modified epoxy mortar is applied to practice for improving the seismic performance of RC members.

An Performance Evaluation of Seismic Retrofitted Column Using FRP Composite Reinforcement for Rapid Retrofitting (긴급시공이 가능한 FRP 복합재료 보강재로 보강된 기둥의 내진성능평가)

  • Kim, Jin-Sup;Seo, Hyun-Su;Lim, Jeong-Hee;Kwon, Min-Ho
    • Journal of the Korea Concrete Institute
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    • v.26 no.1
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    • pp.47-55
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    • 2014
  • As increasing number of large-size earthquake around Korean peninsula, many interests have been focused to the earthquake strengthening of existing structures. The brittle fracture of Non-seismic designed columns lead to full collapse of the building. In the past, cross-sectional extension method, a steel plate reinforcing method and fiver-reinforced method are applied to Seismic Rehabilitation Technique mainly. However, the reinforcement methods have drawbacks that induce physical damage to structures, large space, long duration time. So, in this study, performance evaluation of previously developed FRP seismic reinforcement which do not induce physical damage and short duration time was enforced. The specimens were constructed with 80% downscale. FRP seismic reinforcement are manufactured of glass fiber or aluminum plate with holes and glass fiber. From the experiment results, seismic performance of specimens which reinforced with FRP seismic reinforcement were increased.

Development of Performance-Based Seismic Design of RC Column Using FRP Jacket by Displacement Coefficient Method (FRP 보강 철근콘크리트기둥의 변위계수법에 의한 내진성능설계기법 개발)

  • Cho, Chang-Geun;Ha, Gee-Joo;Bae, Su-Ho
    • Journal of the Korea Concrete Institute
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    • v.19 no.4
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    • pp.491-497
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    • 2007
  • In the current research, the scheme of displacement-based seismic design for seismic retrofit of concrete structures using FRP composite materials has been proposed. An algorithm of the nonlinear flexural analysis of FRP composite concrete members has been presented under multiaxial constitutive laws of concrete and composite materials. An algorithm for performance-based seismic retrofit design of reinforced concrete columns with FRP jacket has been newly introduced to modify the displacement coefficient method used in reinforced concrete structures. From applications of retrofit design, the method are easy to apply in the practice of retrofit design and give practical prediction of nonlinear seismic performance evaluation of retrofitted structures.

Seismic Performance Evaluation of Medium-and Low-rise R/C Buildings Strengthened with RCSF External Connection Method by Pseudo Dynamic Test (유사동적실험에 의한 RCSF 외부접합공법으로 내진보강 된 중·저층 철근콘크리트 건물의 내진성능 평가)

  • Lee, Kang-Seok
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.19 no.1
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    • pp.13-22
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    • 2015
  • In this study, a new RCSF (Reinforced Concrete Steel Frame) external connection method is proposed for seismic strengthening of medium-and low-rise reinforced concrete buildings. The RCSF method, proposed in this study, is capable of carrying out the seismic retrofitting construction while residents can live inside structures. The method is one of the strength design approach by retrofit which can easily increase the ultimate lateral load capacity of concrete buildings controlled by shear. The pseudo-dynamic test, designed using a existing school building in Korea, was carried out in order to verify the seismic strengthening effects of the proposed method in terms of the maximum load carrying capacity and ductility. Test results revealed that the proposed RCSF strengthening method installed in RC frame enhanced conspicuously the strength and displacement capacities, and the method can resist markedly under the large scaled earthquake intensity level.

An Experimental Study on Seismic Performance Evaluation of Retrofitted Column of FRP Seismic Reinforcement that can be Emergency Construction (긴급시공이 가능한 FRP 내진보강재로 보강된 기둥의 내진성능평가 실험)

  • Kim, Jin-Sup;Kwon, Min-Ho;Seo, Hyun-Su;Lim, Jeong-Hee;Kim, Dong-Young
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.17 no.6
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    • pp.21-30
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    • 2013
  • As increasing number of large-size earthquake, the social interest of seismic retrofitting of RC structure is growing. Especially, the RC columns that are not reflected seismic design can not resist lateral loads by the earthquake. The brittle fracture of Non-seismic designed columns lead to full collapse of the building. Thus, the emergency columns reinforcement method is needed. That have a fast construction time, do not cause damage to the column. In the past, cross-sectional expansion method, a steel plate reinforcing method is applied mainly, but in recent years, carbon fiber sheet taking advantage of FRP (Fiber Reinforced Polymer) is widely used. In this study, retrofitting effect of seismic performance of FRP seismic reinforcement, which is possible to emergency construction, was examined. Reinforced concrete specimens were constructed to experimental study. The seismic performence of specimes retrifitted with FRP seismic reinforcement were evaluated. As a result, the seismic performance of specimen reinforced with FRP seismic reinforcement has been improved.