• Title, Summary, Keyword: Push-out test

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Analysis of a Load Carrying Behavior of Shear Connection at the Interface of the Steel-Concrete Composite Beam (합성보 전단연결부의 구조거동에 대한 비교 분석)

  • Shin, Hyun Seop
    • Journal of Korean Society of Steel Construction
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    • v.17 no.6
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    • pp.737-747
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    • 2005
  • The connection of the slab with the steel beam and thus, the transmission of shear force at the interface of the steel-concrete composite beams is achieved with shear connectors, in general, with shear studs. The composite action through these shear studs has a significant influence on the load carrying behavior of the composite beams. The load carrying capacity of studs is determined through push-out tests. At present, the transferability of this load carrying capacity of studs to composite beams, especially in cases of partial interaction, is being questioned by experimental and theoretical investigations. In this study, a finite element model for the simulation of the behavior of the standard push-out specimen and the composite beams without the implementation of the load-slip curve of the stud connectors from the push-out test is developed. The load carrying behavior of the studs in the composite beams is estimated and compared with the results of the push-out test. The reason for the difference in the load carrying behavior of the studs in the push-out test specimen and in the composite beams is found.

Mechanical Behaviors of Studs and High-Tensile Bolts by Push-Out Test (Push-Out Test에 의한 스터드와 고장력 볼트의 역학적 거동)

  • Kim, Yong-Hee;Lee, Myung-Dong;Moon, Tae-Gyeong
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.3 no.2
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    • pp.169-175
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    • 1999
  • Shear connectors are completely important to composite each other in steel concrete composite structures. Therefore a strength of shear connectors and relation of a load-slip have been carried out experimentally and analytically by the Push-Out test for this study. In this paper, eleven specimens were tested and the behavior of shear connectors in steel concrete composite structures are investigated.

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Bond Strength between Concrete and Steel and Shear Behavior of Shear Connectors of H-shaped Steel Encased Composite Columns (H형강 매입형 합성기둥의 부착강도 및 전단연결재의 전단거동)

  • Wang, Ning;Lee, Hye Lim;Lee, Myung Jae
    • Journal of Korean Society of Steel Construction
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    • v.29 no.5
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    • pp.377-387
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    • 2017
  • The objective of this study is to investigate the influence that how does contact surface between concrete and steel influence the steel encased composite column by push-out test. Also nominal bond stress indicated by design standard such as Eurocode 4 is underestimated in small scale steel encased composite column. The other objective of this study is to investigate how does the number and space of shear connector influence the H-shaped steel encased composite column. The shear behavior of shear connectors is investigated by push-out test.

Push-out Test on Welded Angle Shear Connectors used in Composite Beams (합성보에 적용된 앵글 전단연결재의 Push-out 실험)

  • Kim, Young Ju;Bae, Jae Hoon;Ahn, Tae Sang;Jang, Dong Woon
    • Journal of Korean Society of Steel Construction
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    • v.26 no.3
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    • pp.155-167
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    • 2014
  • Steel-concrete composite beam has been used for a considerable time in building construction. An essential component of a composite beam is the shear connection between the steel section and the concrete slabs, which is provided by mechanical shear connectors. A variety of shapes and devices have been in use as shear connectors. This study summarizes the results of an experimental investigation involving the testing of push-out specimens with angle shear connectors. All of 22 push-out specimens were designed to study the effect of a number of parameters on the shear capacity of angle shear connectors such as the height of the angle connector, the length of welding, and the pitch of angles. Based on the test results, a design equation was developed for predicting the shear strength of angle shear connectors.

Fatigue experiment of stud welded on steel plate for a new bridge deck system

  • Ahn, Jin-Hee;Kim, Sang-Hyo;Jeong, Youn-Ju
    • Steel and Composite Structures
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    • v.7 no.5
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    • pp.391-404
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    • 2007
  • This paper presents push-out tests of stud shear connectors to examine their fatigue behavior for developing a new composite bridge deck system. The fifteen push-out specimens of D16 mm stud welded on 9 mm steel plate were fabricated according to Eurocode-4, and a series of fatigue endurance test and residual strength test were performed. Additionally, the stiffness and strength variations by cyclic loading were compared. The push-out test, when the stiffness reduction ratio of the specimens was 0.95 under cyclic load, resulted in the failure of the studs. The stiffness variation of the push-out specimens additionally showed that the application of cyclic loads reduced the residual strength. The fatigue strength of the shear connectors were compared with the design values specified in the Eurocode-4, ASSHTO LRFD and JSSC codes. The comparison result showed that the fatigue endurance of the specimens satisfies the design values of these codes.

The push-out bond strength of BIOfactor mineral trioxide aggregate, a novel root repair material

  • Akbulut, Makbule Bilge;Bozkurt, Durmus Alperen;Terlemez, Arslan;Akman, Melek
    • Restorative Dentistry and Endodontics
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    • v.44 no.1
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    • pp.5.1-5.9
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    • 2019
  • Objectives: The aim of this in vitro study was to evaluate the push-out bond strength of a novel calcium silicate-based root repair material-BIOfactor MTA to root canal dentin in comparison with white MTA-Angelus (Angelus) and Biodentine (Septodont). Materials and Methods: The coronal parts of 12 central incisors were removed and the roots were embedded in acrylic resin blocks. Midroot dentin of each sample was horizontally sectioned into 1.1 mm slices and 3 slices were obtained from each root. Three canal-like standardized holes having 1 mm in diameter were created parallel to the root canal on each dentin slice with a diamond bur. The holes were filled with MTA-Angelus, Biodentine, or BIOfactor MTA. Wet gauze was placed over the specimens and samples were stored in an incubator at $37^{\circ}C$ for 7 days to allow complete setting. Then samples were subjected to the push-out test method using a universal test machine with the loading speed of 1 mm/min. Data was statistically analyzed using Friedman test and post hoc Wilcoxon signed rank test with Bonferroni correction. Results: There were no significant differences among the push-out bond strength values of MTA-Angelus, Biodentine, and BIOfactor MTA (p > 0.017). Most of the specimens exhibited cohesive failure in all groups, with the highest rate found in Biodentine group. Conclusions: Based on the results of this study, MTA-Angelus, Biodentine, and BIOfactor MTA showed similar resistances to the push-out testing.

Numerical simulation of Y-type perfobond rib shear connectors using finite element analysis

  • Kim, Kun-Soo;Han, Oneil;Gombosuren, Munkhtulga;Kim, Sang-Hyo
    • Steel and Composite Structures
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    • v.31 no.1
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    • pp.53-67
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    • 2019
  • This study presents finite element analysis (FEA) on a Y-type perfobond rib shear connection using Abaqus software. The performance of a shear connection is evaluated by conducting a push-out test. However, in practice, it is inefficient to verify the performance by conducting a push-out test with regard to all design variables pertaining to a shear connector. To overcome this problem, FEA is conducted on various shear connectors to accurately estimate the shear strength of the Y-type perfobond rib shear connection. Previous push-out test results for 14 typical push-out test specimens and those obtained through FEA are compared to analyze the shear behavior including consideration of the design variables. The results show that the developed finite element model successfully reflects the effects of changes in the design variables. In addition, using the developed FEA model, the shear resistance of a stubby Y-type perfobond rib shear connector is evaluated based on the concrete strength and transverse rebar size variables. Then, the existing shear resistance formula is upgraded based on the FEA results.

COMPARISON OF BOND STRENGTH OF A FIBER POST CEMENTED WITH VARIOUS RESIN CEMENTS (다양한 레진시멘트로 합착한 섬유포스트의 결합강도 비교)

  • Lee, Hyun-A;Cho, Young-Gon
    • Restorative Dentistry and Endodontics
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    • v.33 no.6
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    • pp.499-506
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    • 2008
  • The purpose of this study was to compare the push-out strength of a fiber post cemented with various resin cements. Newly extracted 36 human mandibular premolars which had single root canal were selected and their crown portions were removed. The root canal was instrumented using $PROTAPER^{TM}$ system and obturated using continuous wave technique. In each root, a 9-mm deep post space was prepared. #2 translucent fiber post (DT Light post, Bisco Inc., Schaumburg, IL, U.S.A.) was cemented using injection technique with Uni-dose needle tip (Bisco) and six different resin cements. The tested resin cements were Duo-Link (Bisco Inc., Schaumburg, IL, U.S.A.), Variolink II (Ivoclar-Vivadent AG, Schann, Liechtenstein), Panavia F (Kuraray Medical Inc., Okayama, Japan), Multilink Automix (Ivoclar-Vivadent AG, Schann, Liechtenstein), RelyX Unicem (3M ESPE Dental Products, St. Paul, MN, U.S.A.), and Maxcem (Kerr Co., CA, U.S.A.). After storage in distilled water for 24 hours, each root was transversally sectioned into approximately 1-mm thick sections. This procedure resulted in 6 serial sections per root. Push-out test wasperformed using a universal testing machine (EZ Test, Shimadzu Co.) with a crosshead speed of 1 mm/min. The data were analyzed with one-way ANOVA and Tukey HSD (p=0.05). The push-out strength of the groups which cemented fiber post with Panavia F and Multilink Automix were lower than those of the other groups. But, there were no statistically significant difference among groups at a probability level of 0.05.

A Study on the Slip Test of Shear Connector in Fire (전단 연결재의 고온 성능 평가에 관한 연구)

  • Han, Sang-Hoon;Park, Won-Sup;Lee, Choul-Ho
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • pp.48-51
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    • 2008
  • Shear connector is the element which resist in the horizontal shear force between steel and concrete of composite members and the stud bolt is often used because of its constructional convenience and serviceability. Although the push-out test is the most common method to evaluate shear slip behaviour, it is suitable for only room temperature conditions. In this study, we investigated about shear force, temperature distribution and slip displacement of shear connector in high temperature through the modified push-out test with electronic furnace invented for steel part heating.

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Shear resistance characteristic and ductility of Y-type perfobond rib shear connector

  • Kim, Sang-Hyo;Park, Se-Jun;Heo, Won-Ho;Jung, Chi-Young
    • Steel and Composite Structures
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    • v.18 no.2
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    • pp.497-517
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    • 2015
  • This study evaluates behavior of the Y-type perfobond rib shear connector proposed by Kim et al. (2013). In addition, an empirical shear resistance formula is developed based on push-out tests. Various types of the proposed Y-type perfobond rib shear connectors are examined to evaluate the effects of design variables such as concrete strength, number of transverse rebars, and thickness of rib. It is verified that higher concrete strength increases shear resistance but decreases ductility. Placing transverse rebars significantly increases both the shear resistance and ductility. As the thickness of the ribs increases, the shear resistance increases but the ductility decreases. The experimental results indicate that a Y-type perfobond rib shear connector has higher shear resistance and ductility than the conventional stud shear connector. The effects of the end bearing resistance, resistance by transverse rebars, concrete dowel resistance by holes, and concrete dowel resistance by Y-shape ribs on the shear resistance are estimated empirically based on the push-out test results and the additional push-out test results by Kim et al. (2013). An empirical shear resistance formula is suggested to estimate the shear resistance of a Y-type perfobond shear connector for design purposes. The newly developed shear resistance formula is in reasonable agreement with the experimental results because the average ratio of measured shear resistance to estimated shear resistance is 1.024.