Bidirectional Loading of R.C. Beam-Column Joints

1986 ◽  
Vol 2 (3) ◽  
pp. 537-564 ◽  
Author(s):  
Roberto Leon ◽  
James O. Jirsa
Keyword(s):  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Load History ◽  
Slab Geometry ◽  
Moment Resisting Frame ◽  
Beam Geometry ◽  
Floor Slabs ◽  
Moment Resisting ◽  
Column Joint ◽  
Joint Behavior

Fourteen reinforced concrete beam-column joint subassemblages were tested to investigate the effects of load history, beam reinforcement size, beam geometry and floor slabs on joint behavior under cyclic bidirectional load reversals. The full-scale specimens were loaded biaxially to simulate the worst loading condition on the joints of a multi-story ductile moment-resisting frame. The tests showed that biaxial effects can have a significant impact on joint behavior due to the deterioration of column strength, that the beam and slab geometry can significantly affect the joint shear response, and that bond conditions and column-to-beam flexural capacity ratio control the design of such subassemblages.

scholarly journals APPLICATION OF ULTRA HIGH PERFORMANCE FIBRE REINFORCED CONCRETE ON EARTHQUAKE RESISTING STRUCTURE

2021 ◽  
Vol 6 (4) ◽  
Author(s):  
Dr. Ajay P. Shelorkar ◽  
Dr. Pradip D. Jadhao
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Shear Failure ◽  
Reinforced Concrete Beam ◽  
Fibre Reinforced Concrete ◽  
Moment Resisting Frame ◽  
Moment Resisting ◽  
Column Joint ◽  
G 11 ◽  
High Performance Fibre

— Beam column joint is an important component of a reinforced concrete moment resisting frame and should be designed and detailed properly when the frame is subjected to earthquake loading. Failure of beam column joints during earthquake is governed by bond and shear failure mechanism which are brittle in nature. Modern codes provide for reduction of seismic forces through provision of special ductility requirements. A beam column joint has been moulded to the scale of 1:1.5 and the model has been subjected to cyclic loading to find its behavior during earthquake. The earthquake resisting structure is G+11 and has been analyzed using the Seismic Coefficient Method. This paper presents a synthesis of strengthening design of reinforced concrete beam and column by replacing it with Ultra High-Performance Fibre Reinforced Concrete.

Deformation Characteristics of Reinforced Concrete Beam-Column Joint Cores under Earthquake Loading

2003 ◽  
Vol 6 (1) ◽  
pp. 15-21 ◽  
Author(s):  
Sayed A. Attaalla ◽  
Mehran Agbabian
Keyword(s):  
Reinforced Concrete ◽  
Shear Deformation ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Frame ◽  
Bond Failure ◽  
Strain Compatibility ◽  
Concrete Frame ◽  
Column Joint ◽  
Reinforced Concrete Frame Structures

The characteristics of the shear deformation inside the beam-column joint core of reinforced concrete frame structures subjected to seismic loading are discussed in this paper. The paper presents the formulation of an analytical model based on experimental observations. The model is intended to predict the expansions of beam-column joint core in the horizontal and vertical directions. The model describes the strain compatibility inside the joint in an average sense. Its predictions are verified utilizing experimental measurements obtained from tests conducted on beam-column connections. The model is found to adequately predict the components of shear deformation in the joint core and satisfactorily estimates the average strains in the joint hoops up to bond failure. The model may be considered as a simple, yet, important step towards analytical understanding of the sophisticated shear mechanism inside the joint and may be implemented in a controlled-deformation design technique of the joint.

scholarly journals Influence of geometric and material characteristics on the behavior of reinforced concrete beam-column connections

2017 ◽  
Vol 44 (5) ◽  
pp. 377-386
Author(s):  
R.K. Vandana ◽  
K.R. Bindhu
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Ductile Failure ◽  
Reinforced Concrete Beam ◽  
Lateral Loads ◽  
Joint Shear Strength ◽  
Weak Beam ◽  
Aspect Ratios ◽  
Moment Resisting ◽  
Energy Dissipation Capacity

The design of reinforced concrete moment-resisting frames and hence beam-column connections is of great importance in earthquake prone areas. Beam-column joints, which should be sufficiently strong to resist and sustain lateral loads, are designed on the basis of the strong-column weak-beam concept so that they undergo ductile failure. The present study describes the cyclic loading performance of six interior beam-column connection specimens designed to be seismic-resistant with varying aspect ratios, concrete compressive strengths, and beam bar yield strengths. Results indicate that joint ductility and energy dissipation capacity can be enhanced by maintaining a unit aspect ratio. Moreover, joint shear strength can be improved significantly by increasing concrete compressive strength. Beam bar yield strength is observed to influence joint ductility considerably.

Seismic performance of reinforced concrete beam–column joint strengthening by frp sheets

Structures ◽  
2019 ◽  
Vol 20 ◽  
pp. 353-364 ◽  
Author(s):  
Nassereddine Attari ◽  
Youcef Si Youcef ◽  
Sofiane Amziane
Keyword(s):  
Reinforced Concrete ◽  
Seismic Performance ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Column Joint

scholarly journals Cyclic behavior of ultra-high performance fiber reinforced concrete beam-column joint

2018 ◽  
Vol 20 (1) ◽  
pp. 348-360 ◽  
Author(s):  
Patricia A. Sarmiento ◽  
Benjamín Torres ◽  
Daniel M. Ruiz ◽  
Yezid A. Alvarado ◽  
Isabel Gasch ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Fiber Reinforced Concrete ◽  
Cyclic Behavior ◽  
Fiber Reinforced ◽  
High Performance Fiber ◽  
Column Joint

Modeling bond-slip deformations in reinforced concrete beam-column joints

2000 ◽  
Vol 27 (3) ◽  
pp. 490-505 ◽  
Author(s):  
Mostafa Elmorsi ◽  
M Reza Kianoush ◽  
W K Tso
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Concrete Beam ◽  
Element Model ◽  
Reinforced Concrete Beam ◽  
Experimental Results ◽  
Reinforcing Bars ◽  
Bond Slip ◽  
Joint Element ◽  
Column Joint

A new finite element model for reinforced concrete beam-column joints is proposed. The model considers the effects of bond-slip and shear deformations in the joint panel region. The problems associated with modeling bond-slip of anchored reinforcing bars are discussed. The proposed bond-slip model is examined at the element level by comparing its predictions with other analytical and experimental results. The ability of the model to simulate bond deterioration and eventual pullout of anchored reinforcing bars under severe cyclic excitation is demonstrated. This model is incorporated into the global beam-column joint element. Further comparisons are made between the predictions of the proposed beam-column joint model and other analytical and experimental results under reversed cyclic loading to show the validity of the model to describe the bond-slip behavior of the joints.Key words: bond, bond-slip, finite element, beam-column, reinforced concrete, cyclic.

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