• Title/Summary/Keyword: bending test of beam

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Experimental Study on Shear Behavior of HPFRCC Beam (HPFRCC Beam 부재의 전단거동에 관한 실험적 연구)

  • Song, Tae-Hwa;Lee, Seong-Cheol;Shin, Kyung-Joon;Chang, Sung-Pil
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.11a
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    • pp.289-292
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    • 2006
  • In this research, bending shear test of HPFRCC beams is conducted to obtain the shear strength of HPFRCC beams. Parameters are ratio of volume percentage of fibers. Also, the uniaxial tensile test of HPFRCC is conducted to obtain the tensile cracking stress of each parameters. From the uniaxial tensile test result, the shear strength of HPFRCC beams can be calculated by using the preexisting shear analysis model. Then, the shear strengths of bending shear test result and analysis result are compared.

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Bending Performance Evaluation of Hybrid Forming Composite Beam with High Depth (춤이 큰 고성능 하이브리드 합성보의 휨성능 평가)

  • Kim, Sung Bae;Cho, Seong Hyun;Lee, Jae Yeong;Kim, Sang Seup
    • Journal of Korean Society of Steel Construction
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    • v.28 no.6
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    • pp.403-414
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    • 2016
  • Recently according to the decreasing of steel price and increasing of labor cost the various studies of steel structure and composite structure are proceeding. This study developed the new shape of high depth hybid forming composite beam and performed the bending test to evaluate the bending performance by creating 10 specimens. Bending test result showed that capacity of the beam was increased stably. The ratio of the nominal load to the maximum load($P_u/P_n$) is 1.19 and the deformation capacity(${\delta}_{0.8P_u}/{\delta}_y$) is 3.9~4.5. Also, it is possible to apply the existing evaluation equation(KBC 2009) of composite beam.

Finite Element Analysis of Cellular Material According to Aspect Ratio of Cell (셀의 형상비에 따른 미세기공 재료의 유한요소해석)

  • 윤성원;이정우;강충길
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.890-893
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    • 2002
  • This study is focused to predict the behavior of Al foam with closed-cell structure during the 3 point bending test and the upsetting test according to aspect ratio. We calculated characters of aluminum foams with closed-cell structure and took the simulation. The effects on the aspect ratio of the cell was investigated parametrically. The analysis was carried out on two models, First, the bending test in elasticity of the rectangular beam, and Second, the upsetting test in plasticity of the circular cylinder. In the analysis, the deformation of the beam and the cylinder was influenced by the aspect ratio of the cell. Further, We assumed that the geometry of feared aluminum cell change the stress and strain in the test.

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Shear behavior and shear capacity prediction of precast concrete-encased steel beams

  • Yu, Yunlong;Yang, Yong;Xue, Yicong;Liu, Yaping
    • Steel and Composite Structures
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    • v.36 no.3
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    • pp.261-272
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    • 2020
  • A novel precast concrete-encased steel composite beam, which can be abbreviated as PCES beam, is introduced in this paper. In order to investigate the shear behavior of this PCES beam, a test of eight full-scale PCES beam specimens was carried out, in which the specimens were subjected to positive bending moment or negative bending moment, respectively. The factors which affected the shear behavior, such as the shear span-to-depth aspect ratio and the existence of concrete flange, were taken into account. During the test, the load-deflection curves of the test specimens were recorded, while the crack propagation patterns together with the failure patterns were observed as well. From the test results, it could be concluded that the tested PCES beams could all exhibit ductile shear behavior, and the innovative shear connectors between the precast concrete and cast-in-place concrete, namely the precast concrete transverse diaphragms, were verified to be effective. Then, based on the shear deformation compatibility, a theoretical model for predicting the shear capacity of the proposed PCES beams was put forward and verified to be valid with the good agreement of the shear capacities calculated using the proposed method and those from the experiments. Finally, in order to facilitate the preliminary design in practical applications, a simplified calculation method for predicting the shear capacity of the proposed PCES beams was also put forward and validated using available test results.

Bending Analysis of Reinforced Tube Beams (굽힘하중을 받는 보강 사각관 보의 좌굴변형거동 해석)

  • Choi, Nak-Sam;Lee, Sung-Hyuk
    • Proceedings of the KSME Conference
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    • 2007.05a
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    • pp.60-65
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    • 2007
  • Local buckling behaviors of aluminum square tube beams reinforced by aluminum plates under three point bending loads have been analyzed using experimental tests combined with theoretical and finite element analyses. For this analysis true stresses were determined from applied loads and cross-sectional area records of a tensile specimen with a rectangular cross-section by real-time photographing. True strains were also obtained from in-situ local elongation measurements of the specimen gage portion by the multi-point scanning laser extensometer. Six kinds of aluminum tube beam specimens reinforced by aluminum plates were employed for the bending test. The bending deformation behaviors up to the maximum load analyzed by the numerical simulation agreed well with experimental ones. After passing the maximum load, reinforcing plate hindering the local buckling of the tube beam was debonded from the aluminum tube beam. An aluminum tube beam strengthened by aluminum plate on the upper web showed the most excellent bending capacity, which could be explained on the basis of the neutral axis shift and the local buckling deformation range.

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Investigation on the flexural behavior of an innovative U-shaped steel-concrete composite beam

  • Turetta, Maxime;Odenbreit, Christoph;Khelil, Abdelouahab;Martin, Pierre-Olivier
    • Steel and Composite Structures
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    • v.34 no.3
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    • pp.441-452
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    • 2020
  • Within the French CIFRE research project COMINO, an innovative type of composite beam was developed for buildings that need fire resistance with no additional supports in construction stage. The developed solution is composed of a steel U-shaped beam acting as a formwork in construction stage for a reinforced concrete part that provides the fire resistance. In the exploitation stage, the steel and the reinforced concrete are acting together as a composite beam. This paper presents the investigation made on the load bearing capacity of this new developed steel-concrete composite section. A full-scale test has been carried out at the Laboratory of Structural Engineering of the University of Luxembourg. The paper presents the configuration of the specimen, the fabrication process and the obtained test results. The beam behaved compositely and exhibited high ductility and bending resistance. The shear connection in the tension zone was effective. The beam failed by a separation between the slab and the beam at high deformations, excessive shear forces conducted to a failure of the stirrups in this zone. The test results are then compared with good agreement to analytical methods of design based on EN 1994 and design guidelines are given.

Study on the Optimization Design and Impact Experiment of Side Door for Impact Beam in the Vehicle Side Door (차량 측면도어 임팩트 빔의 최적설계 및 측면도어 충돌실험에 관한 연구)

  • Kim, Jae Yeol;Choi, Soon Ho
    • Tribology and Lubricants
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    • v.31 no.1
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    • pp.13-20
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    • 2015
  • The impact beam, a beam-shaped reinforcement installed horizontally between the inside and outside panels of car doors, is gaining importance as a solution to meet the regulations on side collision of vehicles. In order to minimize pelvis injury which is the biggest injury happening to the driver and passengers when a vehicle is subject to side collision, energy absorption at the door impact beam should be maximized. For the inner panel, the thrust into the inside of the vehicle must be minimized. The impact beam should be as light as possible so that the extent of pelvis injury to the driver and passenger during side collision of the vehicle is minimal. To achieve this, the weight of the impact beam, has to be optimized. In this study, we perform a design analysis with a goal to reduce the weight of the current impact design by 30% while ensuring stability, reliability, and comparison data of the impact beam for mass production. We conduct three-point bending stress experiments on conventional impact beams and analyze the results. In addition, we use a side-door collision test apparatus to test the performance of beams made of three (different materials: steel, aluminum, and composite beams).

Design Improvement of Composite Door Section Impact Beam by Three-Point Bending Analysis (3점 굽힘 하중 해석을 통한 복합재 도어 임팩트 빔 단면형상 설계개선)

  • Ha, Jung-Chan;Oh, Sung Ha;Baek, In-Seok;Lee, Seok-Soon
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.19 no.6
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    • pp.80-87
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    • 2020
  • The currently observed trend in car manufacturing is to increase energy-efficiency by producing lighter cars. This study examines the replacement of particular parts, specifically around the impact beam, with material composites 30% lighter than conventional steel currently used. The shape of the impact beam was determined as the trapezoidal cross-sectional area with central reinforcement, using three-point bending analysis. A prototype was fabricated based on the findings of our study and its performance was evaluated by the three-point bending analysis; 2 ply of aramid applied for its displacement. The performance of the final prototype for the door assembly was evaluated using a side-door strength test, which resulted to measured initial strength of 10.5 KN and intermediate strength of 15.6 KN. This research provides a promising solution for better impact beam manufacturing.

Bending Properties of ZnO Nanorod using Nano-Manipulator (나노조작기를 이용한 ZnO 나노막대 굽힘 물성 평가)

  • Jeon, Sang-Gu;Jang, Hoon-Sik;Kwon, Oh-Heon;Nahm, Seung-Hoon
    • Proceedings of the KSME Conference
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    • 2008.11a
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    • pp.260-263
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    • 2008
  • The bending test of an individual ZnO nanorod was performed with a nano-manipulator and a force sensor inside the scanning electron microscope (SEM), and the bending properties of ZnO nanorod were also discussed. The ZnO nanorod used in this experiment was fabricated by means of solution base process. The force sensor used for bending test of ZnO nanorod was typed with cantilever. The force sensor was mounted on the nano-manipulator. The nano-manipulator was controlled and manipulated by a personal computer. The each end of an individual ZnO nanorod was attached on the rigid support and the tip of the force sensor with an electron beam exposure, and then the bending test was carried out by controlling of the nano-manipulator. The bending modulus of a ZnO nanorod was calculated at 69.35GPa after the bending test.

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Measurement of Springback Ratio Using Winding Bend Rig (감아굽힘 실험장치를 이용한 스프링백 비의 측정)

  • 김용우
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2000.04a
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    • pp.88-94
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    • 2000
  • A winding bend rig for measurement of springback ratio is made. It measures the bending angles before and after release of bending load which bends specimens with keeping a constant curvature. Thus the springback ratio can be obtained by using this bend rig. Analytical explanations for the spring back are tried by employing simple beam theory. For the analytical calculations with the theory, Young's modulus, fracture strain and stress-strain curve are necessary and these data are obtained from a tensile test. Using both of the beam theory and the results of tensile test, the springback ratio is also calculated. Comparisons of the two springback ratios, one is obtained from bending test and the other from tensile test, show a good agreement.

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