scholarly journals Alternative mathematical modeling for plastic hinge of reinforced concrete beam

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Mohamed A. Farouk ◽  
Khaled F. Khalil
Keyword(s):  
Mathematical Modeling ◽  
Reinforced Concrete ◽  
Concrete Beam ◽  
Plastic Hinge ◽  
Reinforced Concrete Beam

scholarly journals Seismic design and behaviour of external reinforced concrete beam-column joints incorporating 500E grade steel reinforcing

2005 ◽  
Vol 38 (2) ◽  
pp. 73-86
Author(s):  
Leslie M. Megget
Keyword(s):  
Reinforced Concrete ◽  
Seismic Design ◽  
Concrete Beam ◽  
Plastic Hinge ◽  
Reinforced Concrete Beam ◽  
Hinge Zone ◽  
Farthest Point ◽  
Large Earthquakes ◽  
Current Standards ◽  
Grade Steel

Four external reinforced concrete beam-column sub-assemblages were tested under pseudo seismic cyclic loading. The approximately 2/3 scale units incorporated the new Grade 500E reinforcing steel as the beam bars. Two different forms of beam bar anchorage were tested, the normal 90-degree "standard hook" and the continuous U-bar detail. In all units the farthest point of the beam bar anchorage was positioned at the minimum limit prescribed in the NZ Concrete Standard (NZS3101), namely ¾ of the column depth from the inner column face. All 4 units formed plastic hinges in the beam and joint degradation was minor. Failure occurred at drift ratios between 4 and 6% (approximate ductility factors of between 4 and 6) predominantly due to buckling of the beam bars in the plastic hinge zone. The stiffness of these units was significantly less than similar units reinforced with 300E Grade reinforcing or the recently replaced 430 MPa reinforcement. The decreased stiffness will cause higher lateral drifts during large earthquakes, than those anticipated in current Standards.

Estimation of Ultimate Tendon Stress in Reinforced Concrete Beams Prestressed with External FRP Tendons

2013 ◽  
Vol 798-799 ◽  
pp. 374-377
Author(s):  
Shuan Jiang
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Plastic Hinge ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Test Results ◽  
Stress Increment ◽  
Hinge Zone ◽  
Good Agreement

The ultimate tendon stress is the key to calculation of flexural capacity in reinforced concrete beam prestressed with external FRP tendons (RCBPEFT). Based on the theory of equivalent plastic hinge zone, the general formulas for calculating the ultimate tendon stress increment and ultimate tendon stress in RCBPEFT are therefore proposed. Comparisons indicate that the predictions are in good agreement with the test results.

Mechanism of shear transfer in a reinforced concrete beam

1999 ◽  
Vol 26 (6) ◽  
pp. 810-817 ◽  
Author(s):  
Akin A Olonisakin ◽  
Scott DB Alexander
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Shear Failure ◽  
Plastic Hinge ◽  
Failure Surface ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Shear Transfer ◽  
Arching Action ◽  
Wide Beams

This paper presents an analysis of the results of five tests conducted on four reinforced concrete beams. The tests were performed principally to investigate the mechanics of internal shear transfer in a transversely loaded concrete beam with no shear reinforcement. Test specimens consisted of simply supported wide beams with steel flexural reinforcement. The reinforcement for two of the beams was epoxy coated. The shear span to depth ratios were 2.93, 3.32, and 3.81. Measured strains on the reinforcement were used to divide the total shear into its beam and arching action components. In all tests, beam and arching action shear transfer mechanisms were found to coexist. Apart from that with the longest span, all tests ended with rupture of the concrete along a diagonal failure surface. It is concluded that shear failure may be caused by a shift in the internal mechanics of shear transfer from beam action to arching action. Because this shift may be initiated by the yielding of reinforcement, it can be associated with the formation of a plastic hinge. There was no observed effect on the mechanics of shear transfer that could be attributed to epoxy coating of the reinforcement.Key words: arching action, beam action, one-way shear, shear transfer, reinforced concrete beam, bond forces, bar force gradient.

Influence of loading history on the response of a reinforced concrete beam

2001 ◽  
Vol 34 (2) ◽  
pp. 107-124 ◽  
Author(s):  
J.M. Ingham ◽  
D. Liddell ◽  
B.J. Davidson
Keyword(s):  
Experimental Data ◽  
Reinforced Concrete ◽  
Concrete Beam ◽  
Plastic Hinge ◽  
Reinforced Concrete Beam ◽  
The United States ◽  
Companion Paper ◽  
Test Beam ◽  
Prototype Structure ◽  
Beam Plastic Hinge

An investigation considering the influence of loading histories on the performance of a reinforced concrete beam plastic hinge is described. Twelve loading histories were considered, including conventional procedures employed in the United States, Japan and New Zealand, and artificially generated histories derived from recorded earthquake ground motions. Details of the prototype structure and the test beam are described, followed by comprehensive reporting o f experimental data. Performance descriptors and further treatment of the experimental data are presented in a companion paper.

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