• Title/Summary/Keyword: 하이브리드 합성보

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Seismic Performance of HyFo Beam with High Depth-to-SRC Column Connections (춤이 큰 하이브리드 합성보와 SRC기둥 접합부의 내진성능에 관한 연구)

  • Kim, Sung Bae;Jeon, Yong Han;Cho, Seong Hyun;Choi, Young Han;Kim, Sang Seup
    • Journal of Korean Society of Steel Construction
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    • v.29 no.2
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    • pp.135-145
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    • 2017
  • This study is a secondary study that is a cyclic seismic test of High depth hybrid composite beam and column connection after the primary bending strength test of a high depth Hybrid composite beam. Total of 3 seismic test specimens were prepared to cyclic test. The bracket and beam web spliced by high strength bolt and the bracket and beam upper flange was spliced by welding. Test results showed that the seismic strength was higher than the plastic moment($M_p$) in the positive negative moment section, the requirement of composite intermediate moment frame wes satisfied. Therefore, the requirement of intermediate moment frame can be secured by applying the details of connection of this study results.

Bending Performance Evaluation of Hybrid Composite Beam with Low Depth and New Shape (춤이 작은 신형상 고성능 하이브리드 합성보의 휨성능 평가)

  • Kim, Sung Bae;Cho, Seong Hyun;Oh, Kwang Soo;Jeon, Yong Han;Choi, Young Han;Kim, Sang Seup
    • Journal of Korean Society of Steel Construction
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    • v.28 no.3
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    • pp.151-162
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    • 2016
  • This study developed the shape of low depth new shape high performance hybrid composite beam which is taken strengths and compensated the defect of composite beam and hybrid beam. Also, this study performed the monotonic test to evaluate the bending performance of Low depth shape by creating 12 bending specimens. Bending performance test result showed that capacity of the beam was increased stably. Also, it is possible to apply the existing evaluation equation(KBC 2009) of composite beam. Mechanical properties and structural performance of materials are considered when high-strength steel ($F_y=650MPa$) is applied to the bottom plate.

Fire Resistance of U-shape Hybrid Composite Beam (신형상 U형 하이브리드 합성보의 내화성능에 관한 연구)

  • Kim, Sung Bae;Kim, Sang Seup;Ryu, Deog Su;Choi, Seng Kwan
    • Journal of Korean Society of Steel Construction
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    • v.25 no.4
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    • pp.379-388
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    • 2013
  • This paper aims to experimentally investigate the fire resistance of U-shaped hybrid composite beams protected by spay and paint insulations. Subjected to two and three hours of the Standard ISO fire, the flexural performance of 4.4m beams with/without imposed loadings was examined with respect to failure criteria such as deflection and deflection rate of the mid-span and temperatures measured in the steel section. The results demonstrated that the proposed configuration of the composite beam is able to achieve a very competitive 3-hour fire resistance rating in economical aspects.

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.

Flexural Behavior and Design of Concrete-filled U-shape Hybrid Composite Beams Fabricated from 570MPa High-strength Steel (570MPa급 고강도강을 적용한 콘크리트 채움 U형 하이브리드 합성보의 휨거동 및 설계)

  • Lee, Cheol Ho;So, Hyun Joon;Park, Chang Hee;Lee, Chang Nam;Lee, Seung Hwan;Oh, Ha Nool
    • Journal of Korean Society of Steel Construction
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    • v.28 no.2
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    • pp.109-120
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    • 2016
  • Flexural tests of full-scale concrete-filled U-shape hybrid composite beams were conducted. Ordinary (SS400) and high-strength (SM570) steel plates were used in the web and in the bottom flange of U-shape steel section respectively. The primary objectives were to develop the hybrid section configuration with maximized flexural capacity and to investigate its flexural strength and deformation capacity. All the hybrid test specimens in this study exhibited the plastic moment capacity and resonable deformability. It is shown that the plastic stress distribution can be assumed in calculating the flexural strength of the proposed hybrid composite beams if the plastic neural axis is located within 15% of the total beam depth from the top of the composite slab. The procedure for computing the effective flexural stiffness of hybrid composite beams is also recommended based on test results.

Flexural Testing of Asymmetric Hybrid Composite Beams Fabricated from High-strength Steels (고강도강재를 적용한 비대칭 하이브리드 합성보의 휨거동 실험)

  • Jun, Su Chan;Han, Kyu Hong;Lee, Cheol Ho;Kim, Jin Won
    • Journal of Korean Society of Steel Construction
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    • v.29 no.3
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    • pp.217-228
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    • 2017
  • Full-scale flexural testing of asymmetric H-shape hybrid composite beams was conducted in this study. In fabricating hybrid H-shape sections, high strength steels were utilized for the bottom flange while ordinary strength steels were used for the top flange and web. With adding a fully composite floor slab, a total of 8 hybrid composite beam specimens were tested. The primary objective was to develop the asymmetric hybrid H-shape composite beams with maximized flexural efficiency and investigate their flexural behavior. Not all the hybrid composite specimens tested in this study exhibited the plastic moment and reasonable deformability. In the specimens with high-strength bottom flange, the longitudinal shear crack of the slab along the beam axis often preceded the development of beam plastic moment, although the slab was designed as fully composite. The mechanical reason for this unexpected behavior is discussed. It is emphasized that the longitudinal shear strength of composite slab should be checked in designing hybrid composite beams utilizing high strength steels like in this study.

Study on the Flexible Strength of U-shape Hybrid Composite Beam (신형상 U형 하이브리드 합성보의 휨성능에 대한 연구)

  • Kim, Sung-Bae;Kim, Sang-Seup;Lee, Won-Rok;Kim, Jung-Yeon;Lee, Seung-Bae;Ryu, Deog-Su;Kim, Dae-Hoi
    • Journal of Korean Society of Steel Construction
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    • v.24 no.5
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    • pp.521-534
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    • 2012
  • In this research, we carry this study into effect on the basis of utilizing character of composite beam and developing applicable section to some of high strength steel. We evaluated flexural capacity of composite beam that is a unit member through experiments. The existing nominal strength formula of Composite Beam which is a previous method was reviewed and the experiment had been progressive by using each composite members as main variables though the result. Capacity evaluation of U-shape Hybrid Forming Beam(HyFo Beam) which is a new shape show as follow from the result. First, it is resonable to resist demand moment by couple moments which are occurred in concrete compressive-strength and steel tensile-strength. Second, the capacity was stably increased in proportion to the depth of beams and the thickness of steel plates. The last, HyFo Beam was showed as ductile behavior.

Study on the Cyclic Seismic Testing of U-shape Hybrid Composite Beam-to-Composite Column Connections (신형상 U형 하이브리드 합성보와 기둥 접합부의 내진성능에 관한 연구)

  • Kim, Sung Bae;Kim, Sang Seup;Ryu, Deog Su
    • Journal of Korean Society of Steel Construction
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    • v.25 no.1
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    • pp.47-59
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    • 2013
  • This study that is a successive secondary study right after the primary bending strength test of a new form of U-shape hybrid composite beam is a cyclic seismic test of U-shape hybrid composite beam and column conncetion. Three specimens are built for the variables which are kinds of columns, depth of beam, continuity or discontinuity of upper plate of beam, and a number of steel bars of end-beam. Kinds of columns are a reinforcement concrete column and a ACT column of CFT shape, and beam depth are 300, and 500 mm. Detail of connection is bolt connection with using a short bracket that is commonly use. As the result, deformability of 2~4% is ensured the floor displacement angle. If it is the negative moment, the maximum moment shows that its capacity is above the nominal moment.

Flexural capacity evaluation of hybrid composite beam using high strength steel (고강도강재를 적용한 하이브리드 합성보의 휨성능 평가)

  • Kim, Dae-Hee;Lee, Kyung-Koo;Kim, Young-Gi;Min, Kyung-Cheol;Byeon, Tae-Woo;Joo, Eun-Hee
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2022.04a
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    • pp.146-147
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    • 2022
  • Exposed composite beams composed of H-beams and concrete slabs are generally used in building structures because of their excellent economics and flexural strength. However, deep beams used under large load often make difficulties in construction. In this study, an exposed composite beam with high strength steel (SM460) used in the bottom flange of built-up H-shaped beam, so-called S-Beam, was proposed in order to reduce beam depth. And its positive and negative flexural strengths were experimentally evaluated. The test results showed that S-Beam has excellent flexural strength and ductility.

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The influence of PEO addition on the anatase phase formation and photocatalytic characteristics of hot-water treated titania (Hot-water treat된 타이태니아의 anatase상 형성과 광촉매특성에 미치는 PEO첨가의 영향)

  • 이용지;이진경;성윤모
    • Proceedings of the Materials Research Society of Korea Conference
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    • 2003.11a
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    • pp.32-32
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    • 2003
  • 최근 환경오염에 대한 문제가 심각해지면서 인체에 유해한 유기물질의 분해에 대한 관심이 높아지고 있으며 따라서 뛰어난 광촉매 특성을 보이는 타이태니아(TiO$_2$)에 대한 많은 연구가 수행되고있다. 타이태니아가 보이는 결정상 중에는 brookite, anatse, rutile이 있는데 이 중에서 anatse 상이 가장 우수한 광촉매 특성을 나타내는 것으로 알려져 있다. 그러나 anatse 상을 얻기 위해서는 $600^{\circ}C$ 이상의 온도로 열처리를 해야 한다는 문제점이 있으며 광촉매 특성을 향상시키기 위해서는 anantase 나노결정을 제조하여 표면적을 극대화시 키는 것이 요구되고 있다. 본 연구에서는 이러 한 두 가지 문제점을 해결하기 위하여 Polyethylen oxide(PEO)-TiO$_2$ 나노하이브리드를 Sol-Gel공정을 이용하여 합성하였으며 이들에 대한 hot-water treatment를 통하여 10$0^{\circ}C$ 이하의 저온에서 anatase 나노결정상의 분말을 합성하는데 성공하였다. 이는 SiO$_2$-TiO$_2$계 하이브리드에서만 hot-water treatment를 통하여 anatase로 결정화가 가능하다는 기존의 연구결과와 상반되는 결과로서 무기질 성분으로서 TiO$_2$만 존재하는 하이브리드에 대한 hoi-water treatment를 통하여 anatase결정상이 형성될 수 있었다.

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