Experimental observations on the seismic shear performance of RC beam-to-column connections subjected to varying axial column force

Based on the shear performance of existing reinforced concrete beam oblique section and referring to the slipping theory of bending crack of the beam, a formula of the diagonal crack width is proposed through the equilibrium condition, the geometric condition and the concrete failure criteria. This formula has explicitly and clearly the physical concept.So,it can be used to check the maximum diagonal crack width of RC beam in the design.

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Experimental Study on Behavior of RC Beam Strengthened with Ridged Aramid Fiber Plate Strip

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.351-352.1028 ◽

2013 ◽

Vol 351-352 ◽

pp. 1028-1033

Author(s):

Seong Soo Kim ◽

Chan Hong Park

Keyword(s):

Brittle Failure ◽

Shear Failure ◽

Aramid Fiber ◽

Rc Beam ◽

Bending Performance ◽

Flexural Failure ◽

Shear Performance ◽

Plate Strip ◽

Separation Failure ◽

Fiber Plate

In this study, to evaluate the bending performance and the shear performance of Aramid Fiber Plate Strip with enhanced attachment, 8 specimens were made for experiment. Most flexural failure specimens showed AFPS rip-off failure or separation failure. In the shear failure specimens, the specimens showed a brittle failure in which the concrete compression edge was broken. Compared with the control beam, the maximum ultimate strength increased by 164~193% for the flexural failure specimen, and by 218~259% for the shear failure specimen. The ductility, however, decreased steeply in the shear-failure specimen as the amount of reinforcement grew.

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AN INVESTIGATION TO DOCUMENT MORROW RESERVOIRS THAT CAN BE BETTER DETECTED WITH SEISMIC SHEAR (S) WAVES THAN WITH COMPRESSIONAL (P) WAVES

10.2172/842648 ◽

2001 ◽

Author(s):

Thomas Cottman

Keyword(s):

P Waves ◽

S Waves ◽

Seismic Shear

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Fatigue Stress-Life Model of RC Beams Based on an Accelerated Fatigue Method

Infrastructures ◽

10.3390/infrastructures4020016 ◽

2019 ◽

Vol 4 (2) ◽

pp. 16

Author(s):

Eljufout ◽

Toutanji ◽

Al-Qaralleh

Keyword(s):

Cyclic Loading ◽

Fatigue Testing ◽

Three Dimensional ◽

Rc Beam ◽

Rc Beams ◽

Testing Methods ◽

Load Range ◽

Fatigue Stress ◽

Life Model ◽

Prediction Band

Several standard fatigue testing methods are used to determine the fatigue stress-life prediction model (S-N curve) and the endurance limit of Reinforced Concrete (RC) beams, including the application of constant cyclic tension-tension loads at different stress or strain ranges. The standard fatigue testing methods are time-consuming and expensive to perform, as a large number of specimens is needed to obtain valid results. The purpose of this paper is to examine a fatigue stress-life predication model of RC beams that are developed with an accelerated fatigue approach. This approach is based on the hypothesis of linear accumulative damage of the Palmgren–Miner rule, whereby the applied cyclic load range is linearly increased with respect to the number of cycles until the specimen fails. A three-dimensional RC beam was modeled and validated using ANSYS software. Numerical simulations were performed for the RC beam under linearly increased cyclic loading with different initial loading conditions. A fatigue stress-life model was developed that was based on the analyzed data of three specimens. The accelerated fatigue approach has a higher rate of damage accumulations than the standard testing approach. All of the analyzed specimens failed due to an unstable cracking of concrete. The developed fatigue stress-life model fits the upper 95% prediction band of RC beams that were tested under constant amplitude cyclic loading.

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Study on shear performance of the connection with external stiffening ring between square steel tubular column and unequal-depth steel beams

Advances in Structural Engineering ◽

10.1177/1369433220981664 ◽

2020 ◽

pp. 136943322098166

Author(s):

Shuhao Yin ◽

Bin Rong ◽

Lei Wang ◽

Yiliang Sun ◽

Wuchen Zhang ◽

...

Keyword(s):

Failure Modes ◽

Plastic Hinge ◽

Steel Tube ◽

Nonlinear Finite Element ◽

Steel Beams ◽

Finite Element Models ◽

Test Results ◽

Panel Zone ◽

Load Paths ◽

Shear Performance

This paper studies the shear performance of the connection with the external stiffening ring between the square steel tubular column and unequal-depth steel beams. Two specimens of interior column connections were tested under low cyclic loading. The deformation characteristics and failure modes exhibited by the test phenomena can be summarized as: (1) two specimens all exhibited shear deformation in steel tube web of the panel zone and (2) weld fracture in the panel zone and plastic hinge failure at beam end were observed. Besides, load-displacement behaviors and strain distributions have been also discussed. The nonlinear finite element models were developed to verify the test results. Comparative analyses of the bearing capacity, failure mode, and load-paths between the equal-depth and unequal-depth beam models have been carried out.

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