CONSIDERATION ON FLEXURAL SHEAR FAILURE MECHANISM OF RC BEAM SUBJECTED TO LARGE DEFORMATION CYCLIC LOADING IN TERMS OF ERROR CATASTROPHE

This paper describes experimental investigation on three square tubed-reinforced-concrete (TRC) column to reinforced concrete (RC) beam joints with internal diaphragms subjected to cyclic loading, where width-to-thickness ratios of the steel tube in the panel zone and levels of axial load were selected as test parameters. Two failure modes, namely, joint shear failure and beam failure + bond failure were observed in the current test. Test results showed that the proposed composite joints exhibited favorable seismic performance.

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Failure Mechanism Comparison of Reversed Cyclic Loading Failure with Shear Failure

Concrete Research and Technology ◽

10.3151/crt1990.6.2_85 ◽

1995 ◽

Vol 6 (2) ◽

pp. 85-97 ◽

Cited By ~ 6

Author(s):

Hideyuki Kinugasa ◽

Setsuro Nomura

Keyword(s):

Cyclic Loading ◽

Failure Mechanism ◽

Shear Failure ◽

Reversed Cyclic Loading ◽

Reversed Cyclic

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FAILURE MECHANISM OF RC BEAM UNDER REVERSED CYCLIC LOADING AFTER FLEXURAL YIELDlNG CAUSED BY LATERAL STRAIN ACCUMULATION IN PLASTIC HINGE REGION ON SLIP REGION

Journal of Structural and Construction Engineering (Transactions of AIJ) ◽

10.3130/aijs.65.147_3 ◽

2000 ◽

Vol 65 (538) ◽

pp. 147-153 ◽

Cited By ~ 2

Author(s):

Hideyuki KINUGASA ◽

Setsurou NOMURA

Keyword(s):

Cyclic Loading ◽

Failure Mechanism ◽

Plastic Hinge ◽

Hinge Region ◽

Lateral Strain ◽

Rc Beam ◽

Strain Accumulation ◽

Reversed Cyclic Loading ◽

Slip Region ◽

Reversed Cyclic

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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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Behaviour of RC beam repaired using alkali activated slag-based agent under static and cyclic loading

Structures ◽

10.1016/j.istruc.2021.02.039 ◽

2021 ◽

Vol 31 ◽

pp. 761-768

Author(s):

Sulaem Musaddiq Laskar ◽

Ruhul Amin Mozumder ◽

Aminul Islam Laskar

Keyword(s):

Cyclic Loading ◽

Rc Beam ◽

Alkali Activated Slag ◽

Activated Slag ◽

Static And Cyclic Loading ◽

Alkali Activated

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Influence of Patching on the Shear Failure of Reinforced Concrete Beam without Stirrup

Infrastructures ◽

10.3390/infrastructures6070097 ◽

2021 ◽

Vol 6 (7) ◽

pp. 97

Author(s):

Stefanus Adi Kristiawan ◽

Halwan Alfisa Saifullah ◽

Agus Supriyadi

Keyword(s):

Reinforced Concrete ◽

Shear Failure ◽

Numerical Study ◽

Unsaturated Polyester ◽

Reinforced Concrete Beam ◽

Concrete Cover ◽

Shear Capacity ◽

Rc Beam ◽

Shear Span ◽

Shear Cracking

Deteriorated concrete cover, e.g., spalling or delamination, especially when it occurs at the web of a reinforced concrete (RC) beam within the shear span, can reduce the shear capacity of the beam. Patching of this deteriorated area may be the best option to recover the shear capacity of the beam affected. For this purpose, unsaturated polyester resin mortar (UPR mortar) has been formulated. This research aims to investigate the efficacy of UPR mortar in limiting the shear cracking and so restoring the shear capacity of the deteriorated RC beam. The investigation is carried out by an experimental and numerical study. Two types of beams with a size of 150 × 250 × 1000 mm were prepared. The first type of beams was assigned as a normal beam. The other was a beam with a cut off in the non-stirrup shear span, which was eventually patched with UPR mortar. Two reinforcement ratios were assigned for each type of beams. The results show that UPR mortar is effective to hamper the propagation of diagonal cracks leading to increase the shear failure load by 15–20% compared to the reference (normal) beam. The increase of shear strength with the use of UPR mortar is consistently confirmed at various reinforcement ratios.

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Buckling Failure Mechanism of a Rock Dam Foundation Fractured by Gentle Through-Going and Steep Structural Discontinuities

Sustainability ◽

10.3390/su12135426 ◽

2020 ◽

Vol 12 (13) ◽

pp. 5426

Author(s):

Donghui Chen ◽

Huie Chen ◽

Wen Zhang ◽

Chun Tan ◽

Zhifa Ma ◽

...

Keyword(s):

Numerical Method ◽

Failure Mechanism ◽

Shear Failure ◽

Distinct Element ◽

Mechanism Analysis ◽

Rock Masses ◽

Dam Foundation ◽

Deformation Features ◽

Universal Distinct Element Code ◽

Distinct Element Code

The failure mechanism analysis of dam foundations is key for designing hydropower stations. This study analyses the rock masses in a sluice section, which is an important part of the main dam of the Datengxia Hydropower Station currently built in China. The stability of the sluice rock masses is predominantly affected by gentle through-going soft interlayers and steep structural fractures. Its foundation failure mechanism is investigated by means of a numerical method, i.e., Universal Distinct Element Code (UDEC) and the geomechanical model method. The modeling principle and process, and results for the rock dam foundation are introduced and generated by using the abovementioned two methods. The results indicate that the failure mechanism of the foundation rock masses, as characterized by gentle through-going and steep structural discontinuities, is not a conventional type of shear failure mechanism but a buckling one. This type of failure mechanism is verified by analyzing the deformation features resulting from the overloading of both methods and strength reduction of the numerical method.

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Strength and Failure Mechanism of Composite-Steel Adhesive Bond Single Lap Joints

Advances in Materials Science and Engineering ◽

10.1155/2018/5810180 ◽

2018 ◽

Vol 2018 ◽

pp. 1-10

Author(s):

Kai Wei ◽

Yiwei Chen ◽

Maojun Li ◽

Xujing Yang

Keyword(s):

Failure Mechanism ◽

Shear Failure ◽

Failure Load ◽

Lap Joints ◽

Adhesive Joints ◽

Adhesive Failure ◽

Interface Failure ◽

Element Analysis ◽

Single Lap Joints ◽

Structural Adhesive

Carbon fiber-reinforced plastics- (CFRP-) steel single lap joints with regard to tensile loading with two levels of adhesives and four levels of overlap lengths were experimentally analyzed and numerically simulated. Both joint strength and failure mechanism were found to be highly dependent on adhesive type and overlap length. Joints with 7779 structural adhesive were more ductile and produced about 2-3 kN higher failure load than MA830 structural adhesive. Failure load with the two adhesives increased about 147 N and 176 N, respectively, with increasing 1 mm of the overlap length. Cohesion failure was observed in both types of adhesive joints. As the overlap length increased, interface failure appeared solely on the edge of the overlap in 7779 adhesive joints. Finite element analysis (FEA) results revealed that peel and shear stress distributions were nonuniform, which were less severe as overlap length increased. Severe stress concentration was observed on the overlap edge, and shear failure of the adhesive was the main reason for the adhesive failure.

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