• Title, Summary, Keyword: Concrete panel

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The Advanced Composite Sandwich Panels for Light Weight of Road Structures (도로구조물 경량화를 위한 복합재료 샌드위치 패널에 관한 연구)

  • Han, Bong Koo
    • International Journal of Highway Engineering
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    • v.16 no.3
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    • pp.1-8
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    • 2014
  • PURPOSES : The purpose of this paper is to demonstrate to the practicing engineers, how to apply the advanced composite materials theory to the road structures. For general construction material used, there is certain theoretical limit in sizes. For super road structure construction, the reduction in panel weight is the first step to take in order to break such size limits. METHODS : For a typical road structures panel, both concrete and advanced composite sandwich panels are considered. The concrete panel is treated as a special orthotropic plate. RESULTS : All types of advanced composite sandwich panels are considered as a self-weights less than one tenth of that of concrete panel. The concrete panel is treated as a special orthotropic plate to obtain more accurate result. CONCLUSIONS : Advanced composite sandwich panels are considered as a self-weights less than one tenth (10%) of that of concrete panel, with deflections less than that of the concrete panel. This conclusion gives good guide line for design of the light weight of road structures.

The Structural Analysis of Corrugated Polyethylene-Plastic Form Panel and Concrete of Composite System (요철형 PE-PANEL과 콘크리트 합성구조물의 구조해석)

  • 김두환;박태인;박우영;한석규
    • Journal of the Korean Society of Safety
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    • v.16 no.2
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    • pp.91-96
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    • 2001
  • Theoretical definitions of mixed behavior of PE panel and connote should have preceded to cause a mixed behavior of connote and polyethylene which have different elastic module, one-line expansion coefficients, poison ratios, compressive strengths and tensile strengths. Consequently, changes are analyzed through experiment process to identify the effects on interpretation of mixed behavior on the basis of temperature change of structures, temperature rise of concrete other than PE panel due to hydration heat temperature rise of concrete other than PE panel due to drying and contraction, working of hydrostatic pressure by storage and temperature gradient From the results of interpretation of the analysis, it is concluded that PE panel have slight influences on the change of guess of structures and maintains structural stability compared with concrete structures without PE panel.

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Strength of Vertical Joints in Large Concrete Panel Structures (대형 콘크리트 패널 구조의 수직접합부 내력에 관한 고찰)

  • 이용재;서수연;이원호;이리형
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.95-98
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    • 1992
  • In large panel structures, the design of joints which interconnect panels, is important deciding the load-bearing capacity of structures. Being various factors in the design of joints, it is difficult to develop a the critical system for the structural analysis of large concrete panel structures. Therefore there is a tendency to depend on the experiment. The purpose of this paper is to investigate the strength and the mechanical behavior of vertical joints in large concrete panel structures.

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Hysteretic Behavior of Precast Concrete Large Panel Structures Subjected to Horizontal Cyclic Loading (반복 횡하중을 받는 프리캐스트 대형 콘크리트 판구조의 이력특성에 관한 실험적 연구)

  • Seo, Soo-Yeon;Yi, Waon-Ho;Lee, Li-Hyung
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.3 no.3
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    • pp.253-260
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    • 1999
  • Main objective of this study is to examine the hysteretic behaviors and to evaluate the capacity of precast concrete (PC) large panel structures simulated from the prototype of 15-story building, Two 1/2 scaled precast concrete wall specimens and one monolithic reinforced concrete specimen were designed and tested under the cyclic loading conditions. The main parameter of test specimens in PC large panel structure is the type of details for vertical continuity of vertical steel in horizontal joint. Also the behaviors of PC large panel structures are compared with that of monolithic reinforcement concrete wall structure. From the results, the stiffness and energy dissipation ratio of the precast concrete specimens are shown little bit lower than those of monolithic reinforced concrete specimen. In the PC large panel structures, the specimen connected vertically by welding (strong connection) showed higher strength than that of the specimen connected vertically by joint box. However the failure pattern of the former showed more brittle than that of the latter due to the diagonal compressive failure of wall panels.

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Structural Behavior on Horizontal Connection for Hybrid Precast Concrete Panel (복합 프리캐스트 콘크리트 패널 수평접합부의 구조적 거동)

  • Lee, Sang-Sup;Park, Keum-Sung
    • Journal of the Architectural Institute of Korea Structure & Construction
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    • v.35 no.10
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    • pp.155-162
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    • 2019
  • Hybrid precast concrete panel is a wall element that is able to quickly construct the core wall structure for moderate-rise modular buildings. Hybrid precast concrete panel has unique characteristics which is a pair of C-shaped steel beams combined at the top and bottom of a concrete wall, In this study, an improved anchorage detail for vertical rebar is proposed to ensure the lateral force resistance performance of hybrid precast concrete panel emulating monolithic concrete wall. Also, the structural performance of horizontal connection is investigated experimentally with the bolt spacing parameter. And the behavior of hybrid precast concrete panel with the improved detail is compared with the monolithic concrete wall tested in a previous study. Finally, the required thickness of C-shaped steel beam to eliminate or minimize the deformation in horizontal connection is calculated by prying action equation.

Dymamic Behavior of Large Concrete Panel Structures Subjected Seismic Loads (지진하중을 받는 대형 콘크리트 판구조의 동적거동-3층 입체구조의 진동실험결과를 중심으로)

  • 서수연;박병순;백용준;이원호;이리형
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.148-153
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    • 1993
  • The paper presents the results of shaking table test conducted on the 1/3.3 scaled large concrete panel model. The behaviors of large concrete panel structures subjected to seismic excitations are controlled by capacity of horizontal and vertical joints. To Study the seismic capacity of the large concrete panel structures, experimental researches for joints and structural assemblage are needed. Especially, since the magnitude of seismic loads are depended on the variation of time, period and accelerations, dynamic test is needed for estimating the seismic resistance of large concrete panel structures. The objective of this paper is to study the behaviors of large concrete panel structures on seismic excitations and to estimate the safety. Test results are as follows : 1) Test model was critically damaged in the first floor horizontal joint by rocking. 2) Elastic limit(0.12kg) of test model was 5times higher than that of korean seismic design code. 3) Maxium base shear of test model at the ground acceleration of 0.12g was 3.5 times higher than the result of equivalent static analysis. 4) Damping ratio of test model turned out 3.9~5.3% and the period at 0.12g was 0.065sec.

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The Properties of Flexural Strength and Density of Extrusion Molding Concrete Panel Using Sepiolite (세피올라이트를 이용한 압출성형 콘크리트 패널의 휨강도 및 밀도 특성)

  • Jung, Eun-Hye;Kang, Cheol;Kim, Jae-Won;Lee, Jung-Koo;Choi, Hun-Gug;Kim, Jin-Man
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.49-52
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    • 2006
  • Extrusion concrete panel is made by extrusion of high viscosity paste. The high viscosity paste is made by mix of cement, silica, reinforced fiber and thickening agent in the dry mixer and wet mixer subsequently, extrusion in the extruder, and curing in the normal steam curer and high pressure steam curer subsequently. To increase a flexural strength of the panel, it is used inorganic fiber as like asbestos. But it was known that the asbestos was harmful to human being lately, in the domestic area it is restricted usage in the construction materials. So, it is demanded the alternative material for asbestos in the extrusion concrete panel. This study is to investigate that the sepiolite is possible to be the alternative of asbestos. The 3 types of sepiolite is applied to the extrusion concrete panel. To investigate the properties of the panel with sepiolite, it is compared the control with asbestos in the flexural strength, the specific density and the spot compressive strength. From the test results, it was found that the panel with sepiolite B is higher than the control with asbestos in the flexural strength and in the density.

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Development of Short-span Precast Concrete Panels for Railway Bridge (철도교용 단지간 프리캐스트 콘크리트패널의 개발)

  • Seol, Dae-Ho;Lee, Kyoung-Chan;Kim, Ki-Hyun;Youn, Seok-Goo
    • Journal of the Korea Concrete Institute
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    • v.28 no.5
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    • pp.545-553
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    • 2016
  • This paper presents experimental static test results of the precast concrete panels developed for short-span concrete bridge deck form. Different from LB-DECK, concrete rib attached to the bottom surface of concrete panel, and Top-bar is not used at the top surface of concrete panel. Number of concrete ribs and cross-section details of concrete rib are determined from the analytical results of parametric study considering the span length and the thickness of concrete bridge decks. Shear rebars are installed at the top surface of concrete panel for composite action between precast concrete panel and cast-in-place concrete. In order to evaluate the safety and the serviceability of the developed short-span concrete panel subjected to design load, static load test is conducted. Three test panels with span length of 1.6m are fabricated, and during the load test displacements, strains and cracks of test panels are measured and final failure modes are investigated. Serviceability of the test panels is evaluated based on the results of displacements, cracking load, and crack width at the design load level. Safety is also evaluated based on the comparison of the ultimate strength and the factored design load of test panels. Based on the test results, it is confirmed the short-span precast concrete panel satisfies the serviceability and safety regulated in design codes. In addition, the range of span length of concrete bridge decks for the short-span concrete panel is discussed.

Flexural Test on Composite Deck Slab Produced with Extruded ECC Panel (압출성형 ECC 패널을 이용하여 제작된 복합바닥슬래브의 휨 거동)

  • Cho, Chang-Geun;Han, Byung-Chan;Lee, Jong-Han;Kim, Yun-Yong
    • Journal of the Korea Concrete Institute
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    • v.22 no.5
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    • pp.695-702
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    • 2010
  • This paper presents a reinforced concrete composite deck slab system newly developed using a high ductile ECC extrusion panel. In the construction practice, the cracking of reinforced concrete slab often becomes a problem especially in parking garages, underground structures, and buildings. The ECC panel manufactured by extrusion process as a precast product has not only a high-quality in control of cracking but also a merit in applying the construction of concrete slab because the use of ECC panel can realize a formless or half-precast construction with cast-in-place concrete. In the newly developed deck slab system, the ECC extrusion panel is located in the bottom of slab with the thickness of 10 mm, reinforcements are assembled and located on the ECC panel, and finally the topping concrete is placed in the field. In order to evaluate the newly developed slab system, experimental works by four point bending test are conducted to compare with the conventional reinforced concrete slab system. From experiment, the developed deck slab system using a ECC panel gives many improved performances both in control of bending cracking and in load-carrying capacities of slabs.

Analysis on the Shear Behavior of Existing Reinforced Concrete Frame Structures Infilled with L-Type Precast Wall Panel (L형 프리캐스트 콘크리트 벽패널로 채운 기존 철근 콘크리트 골조 구조물의 전단 거동 분석)

  • Yu, Sung-Yong;Ju, Ho-Seong;Ha, Soo-Kyoung
    • Journal of the Korean Society for Advanced Composite Structures
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    • v.6 no.2
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    • pp.105-117
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    • 2015
  • The purpose of this study is to develop a new seismic resistant method by using precast concrete wall panels for existing low-rise, reinforced concrete beam-column buildings such as school buildings. Three quasi-static hysteresis loading tests were experimentally performed on one unreinforced beam-column specimen and two reinforced specimens with L-type precast wall panels. The results were analyzed to find that the specimen with anchored connection experienced shear failure, while the other specimen with steel plate connection principally manifested flexural failure. The ultimate strength of the specimens was determined to be the weaker of the shear strength of top connection and flexural strength at the critical section of precast panel. In this setup of L-type panel specimens, if a push loading is applied to the reinforced concrete column on one side and push the precast concrete panel, a pull loading from upper shear connection is to be applied to the other side of the top shear connection of precast panel. Since the composite flexural behavior of the two members govern the total behavior during the push loading process, the ultimate horizontal resistance of this specimen was not directly influenced by shear strength at the top connection of precast panel. However, the RC column and PC wall panel member mainly exhibited non-composite behavior during the pull loading process. The ultimate horizontal resistance was directly influenced by the shear strength of top connection because the pull loading from the beam applied directly to the upper shear connection. The analytical result for the internal shear resistance at the connection pursuant to the anchor shear design of ACI 318M-11 Appendix-D except for the equation to predict the concrete breakout failure strength at the concrete side, principally agreed with the experimental result based on the elastic analysis of Midas-Zen by using the largest loading from experiment.