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.

Experimental and analytical investigations of reinforced concrete beam-column joints retrofitted by single haunch

2020 ◽  
Vol 23 (15) ◽  
pp. 3171-3184
Author(s):  
Ebrahim Emami ◽  
Ali Kheyroddin ◽  
Mohhamad Kazem Sharbatdar
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Peak Load ◽  
Vulnerability Index ◽  
Reinforced Concrete Beam ◽  
Stiffness Ratio ◽  
Limit States ◽  
Joint Shear Strength ◽  
Analytical Results ◽  
Joint Shear

Recently, the single haunch with specifications such as less invasive and architectural consistency, and easy to practice have been adopted as one of the considered retrofitting options for deficient reinforced concrete beam-column joints. In this article, by analytical evaluation, the influence parameters such as haunch to beam stiffness ratio, haunch inclination angles, and mounted position were investigated. Analytical equations were also proposed for haunch to beam stiffness ratio in terms of both shear interaction between haunch and beam-column members and reduction of joint shear demand. Moreover, five exterior beam-column joint sub-assemblies were fabricated afterwards four of those retrofitted by various cross-sectional area of single steel haunch. Then, all of these beam-column joints and remaining one (as-built joint) were experimentally subjected to cyclic loading. To validate the analytical results, the experimental responses in four limit states including first diagonal core crack in as-built joint, drift ratio 2%, the first diagonal core crack in all the joints, and ultimate state (peak load) were provided for comparison. Also, by definition of an index as vulnerability index in fraction ratio of available joint shear force to joint shear strength predicted by international codes, the obtained vulnerability index of experimental responses were compared to analytical results.

The Research of the Realization of Strong Column and Weak Beam Mechanism of Reinforced Concrete Beam Considering the Slab Width

2011 ◽  
Vol 255-260 ◽  
pp. 487-492
Author(s):  
Ying Zhou ◽  
Cui Qiang Zhang ◽  
De Yuan Zhou ◽  
Zhuo Ying Li
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Amplification Factor ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Frame ◽  
Amplification Factors ◽  
Concrete Frame ◽  
Slab Width ◽  
Weak Beam ◽  
Beam Mechanism

This paper gets the column-end moment amplification factors of the concrete frame in the seismic zones of intensity seven and eight, by using the software CANNY and the method of pushover. The results show that when considering the casting slab, the reinforced concrete frame can develop a strong column and weak beam yielding mechanism when the column moment amplification factor adopts 1.4 for seven intensity area and 1.2 for eight intensity zone, preventing the development of collapse.

Cyclic Loading Behavior of Weak Reinforced Concrete Beam-Column Connections

2008 ◽  
Vol 400-402 ◽  
pp. 881-886 ◽  
Author(s):  
Li Xue Jiang ◽  
Shi Ju Zheng ◽  
Wei Ping Zhang ◽  
Xiang Lin Gu
Keyword(s):  
Reinforced Concrete ◽  
Energy Dissipation ◽  
Seismic Behavior ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Transverse Reinforcement ◽  
Negative Moment ◽  
Energy Dissipation Capacity ◽  
Joint Shear ◽  
The One

Eight weak reinforced concrete beam-column connections and two strong ones subjected to cyclic loads were tested. Effects of the one-way slab, top reinforcement ratio of the beam as well as the transverse reinforcement ratio inside the joint on the seismic behavior of reinforced concrete beam-column connections were primarily investigated. Tests results show that, when subjected to the negative moment, the beam flexural resistance increases notably due to the presence of the slab. However, failure mode of the weak connection transforms from the beam flexural failure to the joint shear failure, resulting from the increased joint shear brought by the slab participation. Besides, the presence of the slab reduces the ultimate relative rotation, ductility and energy-dissipation capacity of the connection. Generally, weak connections can receive more benefit from the one-way slab than strong connections. Connections with less amount of top reinforcement in the beam exhibit better ductility and energy-dissipation capacity, which indicates that it is not always good to strengthen the beam negative moment zones in existing structures. The transverse reinforcement inside the joint has little effect on the seismic behavior of the weak connection with a one-way slab.

On-Site Determination of the Polarization Resistance in a Reinforced Concrete Beam

CORROSION ◽  
1988 ◽  
Vol 44 (10) ◽  
pp. 761-765 ◽  
Author(s):  
S. Feliu ◽  
J. A. Gonzalez ◽  
C. Andrade ◽  
V. Feliu
Keyword(s):  
Reinforced Concrete ◽  
Polarization Resistance ◽  
Concrete Beam ◽  
Reinforced Concrete Beam

Analysis of reinforced concrete beam with small fibre

2020 ◽  
Author(s):  
Pavlina Mateckova ◽  
Zuzana Marcalikova ◽  
David Bujdoš ◽  
Marie Kozielova
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Small Fibre
Sign in / Sign up

Export Citation Format

Share Document