• Title/Summary/Keyword: precast-concrete construction

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Study on Safety Evaluation of the Half-Depth Precast Deck with RC Rib Pannel for the Flexural Behavior (리브 형상을 갖는 반단면 프리캐스트 판넬의 휨 안전성 평가 연구)

  • Hwang, Hoon Hee
    • Journal of the Korean Society of Safety
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    • v.34 no.4
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    • pp.76-84
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    • 2019
  • The precast pannels are used as formwork in Half-depth precast deck systems. Therefore, it has many advantages, including safe and convenient construction and reduced construction period compared to cast-in-place construction method. In half-depth precast deck systems, the bonding of precast pannels to cast-in place concrete is very important. To enhance the performance of half-depth precast deck system, it is necessary to improve the composite efficiency of the interface or increase the stiffness of the precast pannel to reduce deformation or stress on the interface. In this study, a flexural test of half-depth precast deck system was performed, in which the shear connecting reinforcement was applied to increase the bonding performance at the interface, and the rib shape precast panels were applied to improve stiffness. In addition, the safety and serviceability of these systems were evaluated. Test results show that all of specimens have the required flexural strength under the ultimate strength limit design. It was also evaluated to have sufficient safety for the serviceability of deflection and crack under the serviceability limit design.

Derivation of the Construction Process for Precast Concrete System based on Off-Site Construction (OSC(Off-Site Construction)기반 PC공법의 시공 프로세스 도출)

  • Jun, Young-Hun;Bae, Byung-Yun;Yun, Won-Gun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2021.05a
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    • pp.289-290
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    • 2021
  • The PC system has advantages in terms of project management, such as shortening the construction period and reducing costs. However, it is difficult to activate the technology due to insufficient application of the technology. Therefore, there is a need for a strategy to expand and activate the PC system. This study is a basic research for PC construction project management, and its purpose is to derive the entire construction process from factory production of PC components to on-site construction. In this study, the construction process of the PC system was derived through literature review, and the main matters for the construction process management of PC system were confirmed in the analysis process. In the future, the results of this study are expected to be used as basic data for research for PC project management, such as deriving construction classification and calculating construction periods.

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Structural Performance of Artificial Reef Using Space Frames (스페이스 프레임을 사용한 인공어초의 구조성능)

  • Ko, Hune-Bum
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.05a
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    • pp.12-13
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    • 2018
  • The purpose of this study is to propose a prototype of an artificial reef primarily composed of space frames and precast concrete members, and also to investigate the structural performance of the reef. The results described in this research confirm that the proposed artificial reef has a structural capacity to withstand 300 kN.

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Construction of the longest open toped steel box girder composite bridge in the country (국내 최장 개구제형 합성형교 시공)

  • Oh, Hyun-Chul;Ma, Hyang-Wook;Kim, In-Gyu;Kim, Young-Jin;Jang, Seung-Kyoon
    • Proceedings of the Korea Concrete Institute Conference
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    • 2009.05a
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    • pp.165-166
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    • 2009
  • This paper is to research for construction of the longest open toped steel box girder composite bridge using precast concrete deck in the country. This type bridge can bring down the construction costs by reducing the steel's weight used it's girders. And, it also can reduce working hours for construction over 6months by applying the precast deck system. I will introduce the process of construction the longest this type bridge within the country named Seochon Bridge

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Construction Cost Analysis of HPC Method by PC Construction Project Cases (사례분석에 의한 HPC공법의 공사비 분석)

  • Noh, ju-seong;Kim, Jae-yeob
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.05a
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    • pp.101-102
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    • 2017
  • This study was carried out as basic study to apply to construction site the HPC method which is being developed. The construction cost of HPC method was analyzed in comparison with conventional method (half slab method). With regard to research method, it was decided that data on construction work carried out by half slab method was analyzed. According to the results of study, in case of being applied to the construction work using a divided column, the number of columns was decreased. So, it was shown that member production cost, and transport and assemblage cost reduced. In case of being applied to construction work using an undivided column, the analysis showed that there was little difference in construction cost. Therefore, the analysis showed that, if HPC construction method was applied to large structure using a large column, the construction cost was reduced to some extent in comparison with conventional half slab method.

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Structural Behaviors of Precast Concrete Box Structures Using Recycled Aggregate (순환골재 콘크리트 박스 구조의 거동)

  • Byun, Keun-Joo;Song, Ha-Won;Kim, Ho-Jin;Nam, Jin-Won;Kim, Ki-Hwan
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.2 no.1
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    • pp.93-102
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    • 2006
  • In order to use a recycled aggregate concrete for precast concrete box structures, the structural behaviors should be analytically and experimentally evaluated. In this study, full-scale precast concrete box structures are manufactured using the recycled aggregate (30% replacement) and natural aggregate. Then, the flexural failure test and shear failure test as well as water leakage lest for the structures arc carried out. First of all, test results of compressive strength show that recycled aggregate concrete is only 4% lower than normal concrete. In the flexural and shear failure test, the structural performances of precast box using the recycled aggregate concrete are 95% of the capacities of normal precast concrete box or more. Especially, the water leakage test shows that leakage pressure of recycled concrete box is more than the critical value, 60kPa, as well as 9% higher than normal precast concrete box. These test results are analyzed and compared with results of finite clement analysis. The comparison shows that test results are more excellent than analytical results. Also, the comparison confirms the applicability of recycled aggregate concrete for the use as practical precast concrete box structure.

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Comparion of Korea-Japan Quality Standards for Grout Materials about PC Member assembly (PC부재 조립용 그라우트 재료 품질 기준의 한일 비교)

  • Kim, Yeon-Ho;Lee, Bum-Sik;Kim, Min-Jun;Kim, Ki-Ho;Jun, Myoung-Hoon
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.11a
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    • pp.127-128
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    • 2023
  • Recently, OSC (off-site construction) construction has been revitalized as a response to the decline in building quality and productivity due to lack of skilled manpower at construction sites, and PC (precast concrete) construction, a representative OSC construction, is insufficiently applied to public housing.This is the situation.In addition, in the case of general contents appearing in standard specifications, the construction standards for quality assurance remain in the 1990s and do not correspond to the current construction environment.In order to improve the quality of PC member joints, we compared and analyzed Korean and Japanese specifications to establish appropriate standards for PC construction quality control, focusing on the quality of grout used in joints.

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Seismic performance assessment of the precast concrete buildings using FEMA P-695 methodology

  • Adibi, Mahdi;Talebkhah, Roozbeh
    • Structural Engineering and Mechanics
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    • v.82 no.1
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    • pp.55-67
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    • 2022
  • The precast reinforced concrete frame system is a method for industrialization of construction. However, the seismic performance factor of this structural system is not explicitly clarified in some existing building codes. In this paper, the seismic performance factor for the existing precast concrete building frame systems with cast-in-situ reinforced shear walls were evaluated. Nonlinear behavior of the precast beam-column joints and cast-in-situ reinforced shear walls were considered in the modeling of the structures. The ATC-19's coefficient method was used for calculating the seismic performance factor and the FEMA P-695's approach was adopted for evaluating the accuracy of the computed seismic performance factor. The results showed that the over-strength factor varies from 2 to 2.63 and the seismic performance factor (R factor) varies from 5.1 to 8.95 concerning the height of the structure. Also, it was proved that all of the examined buildings have adequate safety against the collapse at the MCE level of earthquake, so the validity of R factors was confirmed. The obtained incremental dynamic analysis (IDA) results indicated that the minimum adjusted collapse margin ratio (ACMR) of the precast buildings representing the seismic vulnerability of the structures approximately equaled to 2.7, and pass the requirements of FEMA P-695.

Behavior of grouped stud shear connectors between precast high-strength concrete slabs and steel beams

  • Fang, Zhuangcheng;Jiang, Haibo;Chen, Gongfa;Dong, Xiaotong;Shao, Tengfei
    • Steel and Composite Structures
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    • v.34 no.6
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    • pp.837-851
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    • 2020
  • This study aims to examine the interface shear behavior between precast high-strength concrete slabs with pockets and steel beam to achieve accelerated bridge construction (ABC). Twenty-six push-out specimens, with different stud height, stud diameter, stud arrangement, deck thickness, the infilling concrete strength in shear pocket (different types of concrete), steel fiber volume of the infilling concrete in shear pocket concrete and casting method, were tested in this investigation. Based on the experimental results, this study suggests that the larger stud diameter and higher strength concrete promoted the shear capacity and stiffness but with the losing of ductility. The addition of steel fiber in pocket concrete would promote the ductility effectively, but without apparent improvement of bearing capacity or even declining the initial stiffness of specimens. It can also be confirmed that the precast steel-concrete composite structure can be adopted in practice engineering, with an acceptable ductility (6.74 mm) and minor decline of stiffness (4.93%) and shear capacity (0.98%). Due to the inapplicability of current design provision, a more accurate model was proposed, which can be used for predicting the interface shear capacity well for specimens with wide ranges of the stud diameters (from13 mm to 30 mm) and the concrete strength (from 26 MPa to 200 MPa).

Performance Assessment of Hollow Precast Segmental PSC Bridge Columns (중공 프리캐스트 세그먼트 PSC 교각의 성능평가)

  • Kim, Tae-Hoon;Park, Young-Ky;Kim, Young-Jin;Shin, Hyun-Mock
    • Journal of the Earthquake Engineering Society of Korea
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    • v.14 no.1
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    • pp.51-62
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    • 2010
  • The purpose of this study was to investigate the performance of hollow precast segmental PSC bridge columns. The proposed system can reduce work at a construction site and makes construction periods shorter. Shortened construction times, in turn, lead to important safety and economic advantages when traffic disruption or rerouting is necessary. Two hollow precast segmental PSC bridge columns were tested under a constant axial load and a quasistatic, cyclically reversed horizontal load. A computer program, RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), for the analysis of reinforced concrete structures, was used. The proposed numerical method gives a realistic prediction of performance throughout the loading cycles for several test specimens investigated.