Rehabilitation of earthquake damaged external RC beam-column joints by joint enlargement using prestressed steel angles

2016 ◽  
Vol 46 (2) ◽  
pp. 291-316 ◽  
Author(s):  
Jalil Shafaei ◽  
Abdollah Hosseini ◽  
Mohammad Sadegh Marefat ◽  
Jason M. Ingham
Keyword(s):  
Rc Beam ◽  
Steel Angles

Seismic retrofit of external RC beam–column joints by joint enlargement using prestressed steel angles

2014 ◽  
Vol 81 ◽  
pp. 265-288 ◽  
Author(s):  
Jalil Shafaei ◽  
Abdollah Hosseini ◽  
Mohammd Sadegh Marefat
Keyword(s):  
Seismic Retrofit ◽  
Rc Beam ◽  
Steel Angles

3D RC beam–column joints retrofitted by joint enlargement using steel angles and post-tensioned bolts

2020 ◽  
Vol 220 ◽  
pp. 110975 ◽  
Author(s):  
Armin Maddah ◽  
Ali Golafshar ◽  
Mohammad Hossein Saghafi
Keyword(s):  
Rc Beam ◽  
Steel Angles ◽  
Post Tensioned

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

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.

Seismic retrofit of exterior beam-column joints using steel angles connected by PT bars

2021 ◽  
Vol 236 ◽  
pp. 112111
Author(s):  
Mehdi Khodaei ◽  
Mohammad Hossein Saghafi ◽  
Ali Golafshar
Keyword(s):  
Seismic Retrofit ◽  
Steel Angles

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

Structures ◽  
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

A macro-modelling approach for RC beam-column exterior joints: first results on monotonic behaviour

2021 ◽  
Vol 39 ◽  
pp. 102202
Author(s):  
Ernesto Grande ◽  
Maura Imbimbo ◽  
Annalisa Napoli ◽  
Riccardo Nitiffi ◽  
Roberto Realfonzo
Keyword(s):  
Rc Beam ◽  
First Results ◽  
Modelling Approach

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

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.

scholarly journals Effect of Fiber Volume Fraction on Behavior of Concrete Beams Made with Recycled Concrete Aggregates

2019 ◽  
Vol 253 ◽  
pp. 02004
Author(s):  
Wael Alnahhal ◽  
Omar Aljidda
Keyword(s):  
Fiber Volume Fraction ◽  
Concrete Beams ◽  
Volume Fraction ◽  
Recycled Concrete ◽  
Flexural Behavior ◽  
Beam Specimen ◽  
Rc Beam ◽  
Fiber Volume ◽  
Concrete Aggregates ◽  
Recycled Concrete Aggregates

This study investigates the effect of using different volume fractions of basalt macro fibers (BMF) on the flexural behavior of concrete beams made with 100% recycled concrete aggregates (RCA) experimentally. A total of 4 reinforced concrete (RC) beam specimens were flexural tested until failure. The parameter investigated included the BMF volume fraction (0%, 0.5%, 1%, and 1.5%). The testing results of the specimens were compared to control beam specimen made with no added fibers. The experimental results showed that adding BMF improves the flexural capacity of the tested beams.

Bond properties of steel angles in concrete filled steel tubes

2021 ◽  
Vol 182 ◽  
pp. 106653
Author(s):  
Da-wei Zhang ◽  
Yu Zeng ◽  
Ju Chen ◽  
Fuyuan Gong ◽  
Cheng-bin Liu
Keyword(s):  
Bond Properties ◽  
Steel Tubes ◽  
Steel Angles ◽  
Concrete Filled Steel Tubes
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