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  • Title/Summary/Keyword: reinforced joints

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Structural Seperation of Unsymmetric Highrise Apartments (비정형 고층아파트에서의 구조체 분리 간격)

  • 정하선;현창국;윤영호
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 1989.04a
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    • pp.56-60
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    • 1989
  • It is well known that the symmetric buildings have higher resistance than the unaymetric ones do under seismic load. However, it is sometimes inevitable to build an unsymmetric structure due to the site conditions or architectural needs. The unsymmetric building has structural disadvantages under seismic load. In such a case the structural seperation joints are often used to avoid those disadvantages. This paper presents a method to determine the width of the seperation joints for unsymmetric, reinforced concrete apartments structured by walls and slabs only. The variables of the study were the ratio of shear-wall stiffness to the building length in the same directron, the building height and the story mass.

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Ducitility Estimation of Exterior Beam-Column Joints using High-Strength Concrete (고강도 철근 콘크리트 보-기둥 접합부의 연성평가)

  • 장극관;서대원;황정현
    • Proceedings of the Korea Concrete Institute Conference
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    • 1999.10a
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    • pp.415-418
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    • 1999
  • This paper presents a study in the ductility of reinforced concrete beam-column-slab joints Three assemblies were designed 2/3 scale (f'c=240kg/cm2, f'c=700kg/cm2) and tested to investigate seismic behavior. From the test results, 1) flexural cracks emerge to inside of beam deeply for high strength concrete member, 2) the high-strength specimens degraded in stiffness and strength, and unstable hysteretic behaviors were observed, owing to the brittleness of high-strength concrete beyond its range. 3) The confinement provided by the additional hoops to the column bar is probably the main reason for this improvement in behavior.

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Shear Strength of Beam-Column eoints Using High-Strength Concrete (고강도콘크리트를 사용한 보-기둥 접합부의 전단강도)

  • 장극관;서대원
    • Journal of the Korea Concrete Institute
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    • v.12 no.2
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    • pp.53-62
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    • 2000
  • Under severe lateral loads, ductile moments-resisting reinforced concrete frames will be subjected to large loads and displacements. Thus, large deformation and shear stree are occurred at the beam-column joints which are the most critical region in ductile moments-resisting system. The purpose of this study was to investigate the shear strength of beam-column connection using high strength concrete. Four subassemblies were designed 2/3 scale of read structures and tested. The obtained results are as follows. 1) The transverse beams increase the shear resistance and ductility of joint, 2) The slab was contributed to increase of the flexural capacity of the beam, but was not contributed to increase the joint ductility under cyclic loads. 3) The shear stress factors. given by the ACI code would be modified in evaluating the shear strength of beam-column joints of frame which were constructed with high-strength concrete.

Experimental Study of High Strength Concrete Beam-Column-Slab Connections subjected to cyclic loading (고강도 콘크리트 보-기둥-슬래브 접합부의 반복하중 실험)

  • 오영훈;오정근;장극관;김윤일
    • Proceedings of the Korea Concrete Institute Conference
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    • 1995.04a
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    • pp.339-344
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    • 1995
  • In the design of ductile moment-resisting frames (DMRFs) following the strong column-weak beam dsign philosophy, it is desirable that the joint and column remain essentially elastic in order to insure proper energy dissipation and lateral stability of the structure. The joint has been identified as the "weak link" in DMRFs because any stiffness or strength deterioration in this region can lead to substantial drifts and the possibility of collapse due to P-delta effects. Moreover, the engineer is faced with the difficult task of detailing an element whose size is determined by the framing members, but which must resist a set of loads very different from those used in the design of the beams and columns. Four 2/3-scale beam-column-slab joint assemblies were designed according to existing code requirements of ACI 318-89, representing interior joints of DMRFs with reinforced high strength concrete. The influence on aseismic behavior of beam-column joints due to monolithic slab, has been investigated.estigated.

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Fragility curves and loss functions for RC structural components with smooth rebars

  • Cardone, Donatello
    • Earthquakes and Structures
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    • v.10 no.5
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    • pp.1181-1212
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    • 2016
  • Fragility and loss functions are developed to predict damage and economic losses due to earthquake loading in Reinforced Concrete (RC) structural components with smooth rebars. The attention is focused on external/internal beam-column joints and ductile/brittle weak columns, designed for gravity loads only, using low-strength concrete and plain steel reinforcing bars. First, a number of damage states are proposed and linked deterministically with commonly employed methods of repair and related activities. Results from previous experimental studies are used to develop empirical relationships between damage states and engineering demand parameters, such as interstory and column drift ratios. Probability distributions are fit to the empirical data and the associated statistical parameters are evaluated using statistical methods. Repair costs for damaged RC components are then estimated based on detailed quantity survey of a number of pre-70 RC buildings, using Italian costing manuals. Finally, loss functions are derived to predict the level of monetary losses to individual RC components as a function of the experienced response demand.

The influence of vertical ground motion on the seismic behavior of RC frame with construction joints

  • Yu, Jing;Liu, Xiaojun
    • Earthquakes and Structures
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    • v.11 no.3
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    • pp.407-420
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    • 2016
  • The aim of this study is to investigate the effect of vertical ground motion (VGM) on seismic behavior of reinforced concrete (RC) regular frame with construction joints, and determine more proper modeling method for cast-in-situ RC frame. The four-story RC frames in the regions of 7, 8 and 9 earthquake intensity were analyzed with nonlinear dynamic time-history method. Two different methods of ground motion input, horizontal ground motion (HGM) input only, VGM and HGM input simultaneously were performed. Seismic responses in terms of the maximum vertex displacement, the maximum inter-story drift distribution and the plastic hinge distribution were analyzed. The results show that VGM might increase or decrease the horizontal maximum vertex displacement depending on the value of axial load ratio of column. And it will increase the maximum inter-story drift and change its distribution. Finally, proper modeling method is proposed according to the distribution of plastic hinges, which is in well agreement with the actual earthquake damage.

Inelastic Behavior of High Strength Reinforced Concrete Beam-Column Joint (고강도 철근 및 고강도 콘크리트를 사용한 보-기둥 접합의 비선형 거동)

  • 이정한;조중현;유영찬;이원호;정헌수
    • Proceedings of the Korea Concrete Institute Conference
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    • 1999.04a
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    • pp.547-552
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    • 1999
  • The purpose of this study is to make a contribution to the construction of 40∼60 story R/C high rise building by developing the reinforcing details which can improve the seismic performance of high-strength (f'c=700㎏/㎠, fy=4000, 8000㎏/㎠) R/C beam-column joints. The reinforcing details which can make beam plastic hinging zones moved and spreaded from the column face is proposed to insure the ductile behavior of high-strength RC beam-column joints. The intermediate reinforcement which is vertically anchored by interlinking each intermediate reinforcements is proposed and tested to examine the mechanical performance of proposed details. Main variables are the shape of the intermediate reinforcements and yield strength of rebars. From the test results, the newly proposed intermediate reinforcement details can move and spread the beam plastic hinging zone about 1.0d from the column face.

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A Experimental Study on the Shear Resistant Characteristics of the Large Precast Concrete Panel Structures (조립식 콘크리트 대형판구조물의 접합부 전단내력특성에 관한 실험적 고찰)

  • 송영훈;전상우;윤정배;정일영
    • Proceedings of the Korea Concrete Institute Conference
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    • 1993.10a
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    • pp.237-242
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    • 1993
  • Precast concrete panel buildings are designed to tracsmit shear forces through the joint between the reinforced concrete panels. The shear strength is partly provided by the resistance to sliding at the interface between the precast and in- situ concrete and partly by the dowel action of the reinforcement crossing the joint. The shear resistance to sliding is largely dependent on the shapes and configurations of vertical joints and the vertical loads of horizontal joints. In this paper, the shear strength by the difference of relative strength between panel and joint, the effect of reinforcement, and the effect of vertical load are considered.

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Finite element implementation of a steel-concrete bond law for nonlinear analysis of beam-column joints subjected to earthquake type loading

  • Fleury, F.;Reynouard, J.M.;Merabet, O.
    • Structural Engineering and Mechanics
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    • v.7 no.1
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    • pp.35-52
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    • 1999
  • Realistic steel-concrete bond/slip relationships proposed in the literature are usually uniaxial. They are based on phenomenological theories of deformation and degradation mechanisms, and various pull-out tests. These relationships are usually implemented using different analytical methods for solving the differential equations of bond along the anchored portion, for particular situations. This paper justifies the concepts, and points out the assumptions underlying the construction and use of uniaxial bond laws. A finite element implementation is proposed using 2-D membrane elements. An application example on an interior beam-column joint illustrates the possibilities of this approach.

A Study on the Analysis and Corner Joint Design of Underground R.C Box Structure (지하의 철근콘크리트 박스구조물의 해석 및 우각부 설계에 관한 연구)

  • 오병환;채성태;신호상;김의성
    • Proceedings of the Korea Concrete Institute Conference
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    • 1996.04a
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    • pp.253-257
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    • 1996
  • A basic assumption in the current design and analysis of reinforced concrete(RC) box structures, which are constructed by the open cut and fill method, is that the displacements and forces are uniform in the longitudinal direction of the structure. The solution may be therefore obtatined from the analysis of a unit wide strip along longitudinal axis. This strip is said to be in a plane strain condition, meaning that the out of plane deformations are vanished. The current design of box structure is carried out by the result of planar frame model for the sake of simplicity. The purpose of this study is to show more rational design method of box culverts considering a rigid zone of corner joints. The current analysis of box structures will be compared with the plane strain analysis as well as 3-d shell model. Reinforcement quantity is also determined to resist the tensile force in corner joints of box structures using strut-tie model which has been developed through the elastic analysis.

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