Performance of an Interior Beam-Column Joint with and without a Slab under Cyclic Load

2013 ◽  
Vol 680 ◽  
pp. 211-216
Author(s):  
Saddam M. Ahmed ◽  
Umarani Gunasekaran
Keyword(s):  
Cyclic Load ◽  
Static Displacement ◽  
Ground Shaking ◽  
Moment Resisting Frame ◽  
Cyclic Behaviour ◽  
Moment Resisting ◽  
Column Joint ◽  
Joint Shear ◽  
Horizontal Joint

The beam-column joint is a crucial zone in a reinforced concrete moment resisting frame. It is subjected to large forces during severe ground shaking, and its behaviour has a significant influence on the response of the structure. In the present study, two half-scaled cast-in-situ beam-column subassemblies (i) without slab and (ii) with slab, with reinforcement detailing as per ACI 318-63 (1963) provisions are constructed. The beam-column joints are comprehensively instrumented and tested under static displacement controlled cyclic loading. This paper explains the contribution of the floor slab, especially in “Tension flange” on the overall cyclic behaviour of the subassembly, and the experimental results of horizontal joint shear stress are discussed, and compared with the ACI 352R-02 provisions.

Effect of Bracing Elements on Mechanics and Shear Strength of Exterior Beam-Column Joints in Moment Resisting Frames

2013 ◽  
Vol 343 ◽  
pp. 15-19
Author(s):  
G. Appa Rao ◽  
S. Kanaka Durga
Keyword(s):  
Shear Strength ◽  
Strength Reduction ◽  
Beam Length ◽  
Optimum Location ◽  
Joint Shear Strength ◽  
Moment Resisting Frames ◽  
Moment Resisting Frame ◽  
Moment Resisting ◽  
Column Joint ◽  
Shear Strength Reduction

Beam-column joint in moment resisting frames is very crucial particularly for non-seismically designed cases, which requires strengthening by various methods. This paper reports on shear strength reduction in exterior beam-column joints using haunch elements. Numerical analysis has been performed on exterior beam-column joint of moment resisting frame with and without a haunch element using SAP software. A parametric study has been performed for optimum haunch location (L) along the beam length (Lb) (10%, 12.5%, 15%, 20%, 25%, 40% and 50% of Lb) and the angle of the haunch element along column axis (15°, 30°, 45° and 60°). It has been observed that the optimum location of the haunch element is at 0.2Lb along the beam at an inclination of 45° with the column axis. The analysis results show that the addition of haunch element significantly reduced the joint shear strength.

scholarly journals Proposals of Beam Column Joint Reinforcement in Reinforced Concrete Moment Resisting Frame : A Literature Review Study

2014 ◽  
Vol 95 ◽  
pp. 158-171 ◽  
Author(s):  
Rahmani Kadarningsih ◽  
Imam Satyarno ◽  
Muslikh ◽  
Andreas Triwiyono
Keyword(s):  
Reinforced Concrete ◽  
Literature Review ◽  
Moment Resisting Frame ◽  
Moment Resisting ◽  
Column Joint ◽  
Review Study

Hybrid Model for Retrofitting: A Review

2016 ◽  
Vol 857 ◽  
pp. 200-205
Author(s):  
Manoj S. Pillai ◽  
Jency Sara Kurian
Keyword(s):  
Cost Effective ◽  
Seismic Effect ◽  
Shear Forces ◽  
Ground Shaking ◽  
Hybrid Combination ◽  
Performance Requirements ◽  
Structural Deterioration ◽  
Moment Resisting ◽  
Column Joint ◽  
Hybrid Configuration

Beam-column joint is considered as a crucial zone in moment resisting frames. It is subjected to large forces during an earthquake, due to ground shaking and the response of the building depends on the behavior of the beam-column joint. During analysis, the joints are usually treated as rigid and this fails to consider the effects of various shear forces developed within the joint. So there emerges the need of seismic upgrading owing to structural deterioration, change in functions or increased performance requirements. Damping is one of the commonly adopted methods proposed for achieving optimal performance of the building subjected to seismic actions. In the present study, an economical approach towards the use of dampers in buildings to reduce the seismic effect is studied. A hybrid combination of dampers with steel bracings for retrofitting is studied in this paper. A cost effective hybrid configuration is presented which can simultaneously reduce the seismic effect and the overall cost for retrofitting.

Performance Evaluation of Semi Precast Concrete Beam-Column Connections with U-Shaped Strands

2014 ◽  
Vol 17 (11) ◽  
pp. 1585-1600 ◽  
Author(s):  
Sang-Su Ha ◽  
Seung-Hun Kim ◽  
Moon Sung Lee ◽  
Jeong-Ho Moon
Keyword(s):  
Performance Evaluation ◽  
Precast Concrete ◽  
Stress Transfer ◽  
Structural System ◽  
Moment Resisting Frame ◽  
Moment Resisting ◽  
Column Joint ◽  
Seismic Regions ◽  
Moderate Seismic Regions ◽  
And Performance

In this study, a new precast concrete (PC) beam-column joint of moment resisting frame applicable for moderate seismic regions is proposed. A semi PC beam-column connection with U-shaped strands is developed in an attempt to improve workability and provide effective stress transfer mechanism at the joint. The structural system consists of PC beams with U-shaped strands, PC columns, PC slabs, and topping concrete. A series of three interior and three exterior semi PC joint specimens was tested to investigate the structural behavior of the system subjected to the lateral cyclic load. Key test variables are the number of strands placed in the PC beam and the presence or absence of the transverse reinforcements at the connection. The experiment and performance evaluation of the system were conducted in accordance with ACI T1.1–01 (2001). According to the test results, the proposed structural system with transverse reinforcements at the joint is sufficient to use in moderate seismic regions.

Flexural Performance of Exterior Steel Fiber Reinforced Self-Compacting Concrete Beam-Column Joint Subjected to Reversed Cyclic Loading

2020 ◽  
Vol 17 (9) ◽  
pp. 3934-3939
Author(s):  
B. Nambiyanna ◽  
M. N. Chandan ◽  
R. Prabhakara
Keyword(s):  
Energy Dissipation ◽  
Cyclic Loading ◽  
Steel Fibers ◽  
Self Compacting Concrete ◽  
Reversed Cyclic Loading ◽  
Moment Resisting Frame ◽  
Moment Resisting ◽  
Column Joint ◽  
And Performance ◽  
Reversed Cyclic

Beam-Column Joint plays an imperative part in the seismic enactment of Reinforced concrete moment resisting frame. The response of the structure under the earthquake loads mainly depends on the behavior and performance of the Beam-Column Joint (BCJ). An experimental investigation on exterior reinforced beam-column joints done using steel fibre reinforced self-compacting concrete subjected to reversed cyclic loading is presented in this investigation. The attempt has been made to demonstrate the influence of steel fibers reinforced self-compacting concrete (SCC). Three exterior beam-column joints having the same geometry were cast and tested through reversed cyclic load using displacement-controlled mechanism. All three specimens are designed adequately in accordance with IS 13920:2016 code. The hysteresis loop, ductility factor, stiffness degradation, energy dissipation characteristics, and damage propagation are considered to quantify the response of joint specimens. The results show enhanced ductility, energy dissipation capacity and damage tolerance behavior with the increase in steel fibers percentage in SCC.

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.

scholarly journals Accounting for the Flexibility of Beam-Column Joints within New Zealand Steel Moment-Resisting Frame Structures

2018 ◽  
Vol 763 ◽  
pp. 182-188 ◽  
Author(s):  
Lilliana Wiles ◽  
Jonathan Pethybridge ◽  
Timothy John Sullivan
Keyword(s):  
New Zealand ◽  
Joint Stiffness ◽  
Frame Structures ◽  
Moment Resisting Frame ◽  
Moment Resisting ◽  
Column Joint ◽  
Steel Moment Resisting Frame ◽  
Steel Mrf ◽  
The Impact ◽  
Potential Use

In New Zealand there currently appears to be no simplified, effective method of analysing the rotational stiffness of beam-column joints in steel moment resisting frame structures. Many practicing engineers use simplified design tables to detail beam-column joints for strength requirements, without accounting for the flexibility of joints. This tends to underestimate the flexibility of structures and hence the drifts they undergo in wind and earthquake events. To permit improved consideration of beam-column joint stiffness in a simplified manner, this work adapts the European component method to develop a series of tables that practitioners could look up to quickly identify beam-column joint stiffness values. The potential use for such stiffness values is highlighted by examining the impact of joint flexibility on the drifts expected in a 4-storey steel MRF subject to 1 in 500 year return period earthquake loading.

Stiffening of Moment-Resisting Frame by Precast Concrete Cladding

PCI Journal ◽  
1992 ◽  
Vol 37 (5) ◽  
pp. 80-92 ◽  
Author(s):  
Regina Gaiotti ◽  
Bryan Stafford Smith
Keyword(s):  
Precast Concrete ◽  
Moment Resisting Frame ◽  
Moment Resisting
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