• Title, Summary, Keyword: SRC column

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A Study on the Prediction of Shortening for Steel-Reinforced Concrete(SRC) Column in the High-Rise Buildings (초고층 건물에서 철골철근콘크리트(SRC) 기둥의 축소량 예측에 관한 연구)

  • Jeong Eun-Ho;Kim Jeom-Han
    • Journal of the Korea Concrete Institute
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    • v.16 no.1
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    • pp.36-42
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    • 2004
  • Although steel-reinforced concrete(SRC) is widely used in a high-rise building, a methods used to predict the column shortening of SRC structural members has many problems in applying a theoretical equation which considers only the material characteristics of reinforced concrete. In this study, the degree of accuracy of the existing method calculating the column shortening of a high-rise building is examined. For this, first, the actual measurement data are chosen about the column shortening of a high-rise building established with SRC structural members. Then the column shortening of a SRC structural member is calculated through computer program. Finally, the comparison between the measurement data and the analytical ones is executed. According to this study, it can be concluded that there is little difference between the former and the latter. Therefore, the existing method can be used to evaluate the column shortening of a high-rise building using a SRC structural members.

Seismic Performance Evaluation of SRC Composite Column using Direct Displacement Based Design Method (직접변위기반 설계법에 의한 SRC 합성기둥의 내진성능평가)

  • Jung, In-Kju;Park, Soon-Eung;Kim, Dong-Hyuk
    • Journal of the Korean Association for Spatial Structures
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    • v.12 no.3
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    • pp.63-70
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    • 2012
  • In this study, the displacement-based design concept, the performance by the existing reinforced concerte column and steel reinforced concrete composite column for SRC purchased the maximum design ground acceleration improvement compared to the performance design. SRC have several advantages such as strength enhancement and high ductility. H-beam or steel tubes were used for embedded elements of the SRC composite columns. SRC cross-section for the P-M diagram and analysis on the nominal bending monent SRC designed for composite columns for disparity estimation is presented to the displacement-based seismic design. Performance improvement of the performance-based design performance targets for the design seismic displacement and design criteria for the direct displacement-based design methods and to improve the seismic performance due to the displacement coefficient method is proposed to design. SRC compared with the RC column designed to improve the performance and displacement ductility ratio displacement results in the performance design results showed significantly improved performance.

Experimental Study on Long-term Behavior of RC and SRC Columns (RC 기둥과 SRC 기둥의 장기거동에 관한 실험적 연구)

  • 권승희;김진근;정한욱
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.481-486
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    • 2003
  • This paper presents experimental study on long-term behavior of RC and SRC columns. Shrinkage and creep tests were performed for two types of concrete used in manufacturing RC and SRC column specimens. Also, long-term tests under sustained load were carried out for RC and SRC column specimens. Shrinkage functions and creep coefficients to optimally fit the corresponding data were obtained from regression analysis and the regression results, ACI and CEB- FIP 90 model were applied to analyse long-term behvavior of RC and SRC column specimens. Creep coefficients calculated from test data were lower than those predicted by ACI and CEB-FIP 90 models. Long-term analysis results for RC and SRC column specimens using the regression results were relatively more accurate than those obtained using the existing models.

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Shear Strength and Hysteretic Behavior of SRC Column to Steel Beam Joints (SRC 기둥-H 형강보 접합부의 전단강도 및 이력거동)

  • Lee, Seung Joon;Kim, Won Ki;Seo, Dong Hoon
    • Journal of Korean Society of Steel Construction
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    • v.9 no.2
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    • pp.277-285
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    • 1997
  • To investigate the shear strength and hysteretic behavior of SRC column to H steel beam joints, seven cruciform specimens were fabricated and tested. The test specimens showed stable hysteresis behavior with a little pinching. The strength decreased with increase in deflection after the speciemens reached at the maximum strength. The shear strength of panel zones increased with increased in the concrete amount of SRC column sections. The shear strength may conservatively be estimated by the sum of shear yielding strength of steel column web, plastic bending strength of steel column flange and ultimate shear strength of concrete in the panel zone.

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Field Measurement and Compensation Method of Column Shortening for SRC Columns in 37-story Residential Building (37층 초고층주상복합건물 SRC기둥의 기둥축소량 현장계측 및 보정법)

  • Song, Hwa-Cheol;Do,e Guen-Young;Cho, Hun-hee
    • Journal of the Korea Institute of Building Construction
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    • v.5 no.4
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    • pp.145-152
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    • 2005
  • Long-term axial shortening of the vertical elements of tail buildings results in differential movements between two elements and may lead to the additional moments of connection beam and slab elements, and other secondary effects, such as cracks of partitions or curtain walls. Accurate prediction of time-dependent column shortening is essential for tall buildings from both strength and serviceability aspects. The compensation method is different from reinforced concrete and SRC(Steel Reinforced Concrete) members. The SRC columns are usually compensated according to total differential shortening between two vertical elements. In this study, column shortenings of 37-story W building under construction are predicted and compensated. The SRC column shortenings are compared with the actual column shortening by field measurement and the column shortenings are reanalysed and recompensated.

Inelastic Behavior of the SRC Column (SRC 합성교각의 비탄성 거동)

  • Jung, In-Keun;Min, Jin;Shim, Chang-Su;Chung, Young-Soo
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.300-307
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    • 2005
  • Steel Reinforced Concrete (SRC) composite column has several advantage such as excellent durability, rapid construction, reduction of column section. Due to these aspect, applications of SRC columns to bridge piers are continuously increasing. For the design of relatively large SRC columns for bridge piers, it is necessary to check the current design provisions which were based on small section having higher steel ratio. In this study, seven concrete encased composite columns were fabricated and static tests were performed. Embedded steel members were a H-shape rolled beam and a partially filled steel tube. Based on the test results, the ultimate strength according to section details and local behavior were estimated. For the analysis of inelastic behavior of the SRC column, the cracked section stiffness of the columns was evaluated and compared with calculations. The stiffness of the cracked section showed that 25% of the initial value and this stiffness reduction occurred at 85% of the ultimate load in the experiments.

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An experimental and numerical study on long-term deformation of SRC columns

  • An, Gyeong-Hee;Seo, Jun-Ki;Cha, Sang-Lyul;Kim, Jin-Keun
    • Computers and Concrete
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    • v.22 no.3
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    • pp.261-267
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    • 2018
  • Long-term deformation of a steel-reinforced concrete (SRC) column is different from that of a reinforced concrete (RC) column due to the different moisture distribution. Wide-flange steel in an SRC column obstructs diffusion and makes long-term deformation slower. Previous studies analyzed the characteristics of long-term deformation of SRC columns. In this study, an additional experiment is conducted to more precisely investigate the effect of wide-flange steel on the long-term deformation of SRC columns. Long-term deformation, especially creep of SRC columns with various types of wide-flange steel, is tested. Wide-flange steel for the experiment is made of thin acrylic panels that can block diffusion but does not have strength, because the main purpose of this study is to exclusively demonstrate the long-term deformation of concrete caused by moisture diffusion, not by the reinforcement ratio. Experimental results show that the long-term deformation of a SRC column develops slower than that in a RC column, and it is slower as the wide-flange steel hinders diffusion more. These experimental results can be used for analytical prediction of long-term deformation of various SRC columns. An example of the analytical prediction is provided. According to the experimental and analytical results, it is clear that a new prediction model for long-term deformation of SRC columns should be developed in further studies.

A Study about Damage of Steel Beam to SRC Column Connection in a New Extension Building (증축된 건축물의 SRC 기둥과 철골보 접합부 손상에 관한 연구)

  • Shim, Hak-Bo;Park, Soon-Jeon
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.503-504
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    • 2009
  • It is increased the necessity of the examination for safety of Steel Beam to SRC Column connection part in a new extension building. This study is presented the examination and cause analysis about damage of Steel Beam to SRC Column connection. so it is prevented collapse and extended use duration in building.

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Experimental study on simplified steel reinforced concrete beam-column joints in construction technology

  • Teraoka, Masaru;Morita, Koji;Sasaki, Satoshi;Katsura, Daisuke
    • Steel and Composite Structures
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    • v.1 no.3
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    • pp.295-312
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    • 2001
  • The purpose of this paper is to propose a new type of steel reinforced concrete (SRC) beam-column joints and to examine the structural performance of the proposed joints, which simplify the construction procedure of steel fabrication, welding works, concrete casting and joint strengthening. In the proposed beam-column joints, the steel element of columns forms continuously built-in crossing of H-sections (${\Box}$), with adjacent flanges of column being connected by horizontal stiffeners in a joint at the level of the beam flanges. In addition, simplified lateral reinforcement (${\Box}$) is adopted in a joint to confine the longitudinal reinforcing bars in columns. Experimental and analytical studies have been carried out to estimate the structural performance of the proposed joints. Twelve cruciform specimens and seven SRC beam-column subassemblage specimens were prepared and tested. The following can be concluded from this study: (1) SRC subassemblages with the proposed beam-column joints show adequate seismic performances which are superior to the demand of the current code; (2) The yield and ultimate strength capacities of the beam-to-column connections can be estimated by analysis based on the yield line theory; (3) The skeleton curves and the ultimate shear capacities of the beam-column joint panel are predicted with a fair degree of accuracy by considering a simple stress transfer mechanism.

Experimental research on seismic behavior of SRC-RC transfer columns

  • Wu, Kai;Xue, Jianyang;Nan, Yang;Zhao, Hongtie
    • Steel and Composite Structures
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    • v.21 no.1
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    • pp.157-175
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    • 2016
  • It was found that the lateral stiffness changes obvious at the transfer position of the section configuration from SRC to RC. This particular behavior leads to that the transfer columns become as the important elements in SRC-RC hybrid structures. A comprehensive study was conducted to investigate the seismic behavior of SRC-RC transfer columns based on a low cyclic loading test of 16 transfer columns compared with 1 RC column. Test results shows three failure modes for transfer columns, which are shear failure, bond failure and bend failure. Its seismic behavior was completely analyzed about the failure mode, hysteretic and skeleton curves, bearing capacity deformation ability, stiffness degradation and energy dissipation. It is further determined that displacement ductility coefficient of transfer columns changes from 1.97 to 5.99. The stiffness of transfer columns are at the interval of SRC and RC, and hence transfer columns can play the role of transition from SRC to RC. All specimens show similar discipline of stiffness degradation and the process can be divided into three parts. Some specimens of transfer column lose bearing capacity swiftly after shear cracking and showed weak energy dissipation ability, but the others show better ability of energy dissipation than RC column.