scholarly journals A comparison of the behaviour of reinforced concrete beam-column joints designed for ductility and limited ductility

1988 ◽  
Vol 21 (4) ◽  
pp. 255-278 ◽  
Author(s):  
R. Park ◽  
Ruitong Dai
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
The Other ◽  
Vertical Shear ◽  
Test Results ◽  
Reinforcing Bars ◽  
Design Code ◽  
Concrete Frames ◽  
Column Joint

Four beam-interior column Units were designed, constructed and tested subjected to simulated earthquake and gravity loading. One Unit followed the requirements of the New Zealand concrete design code NZS 3101:1982 for structures designed for ductility. The other three Units only partly followed the requirements of NZS 3101, in order to obtain information on the behaviour of beam-column joints of limited ductility. Plastic hinging was designed to occur in the beams. The major test variables were the quantity of horizontal and vertical shear reinforcement in the beam-interior column joint cores and the diameter of the beam longitudinal reinforcing bars passing through the joint cores. The test results indicted that the current NZS 3101 detailing requirements for shear and bond in the beam-interior column joint core regions of ductile reinforced concrete frames could be relaxed.

scholarly journals Cyclic load testing of two refined reinforced concrete beam-column joints

1979 ◽  
Vol 12 (3) ◽  
pp. 238-255
Author(s):  
R. W. G. Blakeley ◽  
F. D. Edmonds ◽  
L. M. Megget ◽  
J. H. Wood
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Load ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Load Testing ◽  
Test Results ◽  
Dead Load ◽  
Design Code ◽  
Prototype Structure ◽  
Column Joint

The paper describes the testing of two reinforced concrete beam-column joint units tested under incremented-static cyclic
 loading. The full size test units were based upon an interior beam-column joint of a four-storey 
framed building designed to the current NZ loading code and represent 
refinements on two previously tested conventional joints of similar dimensions. One unit differed from common practice by having a post-tensioned beam stressed to balance the floor dead load of the prototype structure whilst the second unit was detailed with haunched beams. Hinge formation occurred in the beams and stable hysteretic behaviour was obtained up to displacement ductilities of 10 for the prestressed unit and 6 for the haunched unit. The test results are analysed in terms of the draft NZ design code, DZ 3101, and the ACI Recommendations for beam-column joint design.

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.

scholarly journals Application of high strength reinforcing bars in earthquake-resistant structure elements

2018 ◽  
Vol 195 ◽  
pp. 02015
Author(s):  
Kurniawan Setiadi Kamaruddin ◽  
Iswandi Imran ◽  
Maulana Derry Imansyah ◽  
Muhammad Riyansyah ◽  
Aris Ariyanto
Keyword(s):  
Reinforced Concrete ◽  
Yield Strength ◽  
Concrete Beam ◽  
High Strength ◽  
Reinforced Concrete Beam ◽  
Reinforcing Bars ◽  
Dissipation Energy ◽  
Reinforcing Bar ◽  
Column Joint ◽  
Normal Strength

Currently, design of reinforced concrete buildings is still dominated with normal strength reinforcing bars, not exceeding 420 MPa yield strength. Meanwhile, the use of higher strength reinforcing bars tend to increase due to some benefits in the construction, such as reducing the total weight of reinforcing bars and alleviating reinforcing bars congestions. In this study, reinforcing bars with yield strength of 520 MPa are utilized in the reinforced concrete beam-column joint. The objective is to study the seismic performance of reinforced concrete beam-column joints. A total of 3 interior beam-column joints, half-scaled specimens with different yield strengths and bar diameters was tested. One of the test specimens which was 16 mm diameter and had normal strength reinforcing bar. The other two specimens use high strength reinforcing bars, and have 16 mm and 19 mm diameter bars. Loading protocol of all the specimens is conformed with ACI 374.2. Dissipation energy and deformability of the joints is then compared. Normalized energy dissipation of the specimens with high strength reinforcing bars was slightly lower than that of the specimens with normal reinforcing bars. However, specimens with high strength reinforcing bars tend to have smaller deformability than that of the specimens with normal reinforcing bars.

scholarly journals Comparison of recent New Zealand and United States seismic design provisions for reinforced concrete beam-column joints and test results from four units designed according to the New Zealand code

1983 ◽  
Vol 16 (1) ◽  
pp. 3-24 ◽  
Author(s):  
R. Park ◽  
J. R. Milburn
Keyword(s):  
United States ◽  
Reinforced Concrete ◽  
New Zealand ◽  
Seismic Design ◽  
Cyclic Load ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Test Results ◽  
Design Code ◽  
Load Tests

A comparison is made of the seismic design provisions for reinforced concrete beam-column joints required by the new New Zealand concrete design code NZS 3101 and recently proposed United States procedures. Large differences are shown to exist between these new provisions of the two countries. Results are reported
of cyclic load tests which were conducted according to the requirements of the new NZS 3101. The test results showed that location
of plastic hinges in beams away from the column faces may be of considerable advantage in the design of joints, when member sizes are small and joint shears are high, due to less congestion of reinforcement and better anchorage conditions.

scholarly journals Tests on an interior reinforced concrete beam-column joint

1981 ◽  
Vol 14 (2) ◽  
pp. 81-92
Author(s):  
R. Park ◽  
L. Gaerty ◽  
E. C. Stevenson
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Shear Reinforcement ◽  
Horizontal Shear ◽  
Design Code ◽  
Column Joint ◽  
Loading Tests ◽  
Run Up ◽  
Cyclic Loading Tests

Cyclic loading tests simulating the effects of a severe earthquake were conducted on an interior reinforced concrete beam-column joint. The unit had been designed according to
the requirements of the draft (1980) SANZ concrete design code except that the horizontal shear reinforcement in the joint core was deliberately made only 78% of that required by the draft SANZ code. The joint core hoops commenced to yield in the first loading run up to the beam flexural strength and with subsequent loading runs degradation of stiffness and strength occurred due to damage concentrating in the joint core. It
was evident that the draft SANZ code is not conservative in its approach to the design of shear reinforcement for interior reinforced concrete beam-column joints.

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.

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
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