scholarly journals A Computer Vision Application for Measuring the Deflection in a Two-dimensional View of Reinforced Concrete Beams

2021 ◽  
Vol 9 (1) ◽  
pp. 13-21
Author(s):  
Eduardo Jr. Piedad ◽  
◽  
Barne Roxette Carpio ◽  
Kristine Sanchez ◽  
Marven Jabian ◽  
...  
Keyword(s):  
Computer Vision ◽  
Reinforced Concrete ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Average Error ◽  
Maximum Deflection ◽  
Two Dimensional ◽  
Loading Test ◽  
Wide Scale ◽  
Vision Application

A novel computer vision application is developed to measure the deflection of two-dimensional (2D) reinforced concrete structural members. Eight beam samples, with dimensions of 160 mm x 150 mm x 1400 mm are loaded and simulated under a four-point loading test until failure using a reaction framework machine. A camera is fixed at the center front view of the concrete beams to capture the deflection of the samples while testing. In each test, a dial indicator is installed and the maximum deflection is manually recorded. Based on the results, the maximum deflection values recorded by the proposed application obtained an average error of 18.38 % when compared to the manual measured results. This indicates that computer vision-based application can provide a beam-wide scale deflection performance, compared to the traditional point-based deflection reading. This study paves a new possibility of aiding manual measurements of concrete beams and all other structural studies.

Application of a Reinforced Self-Compacting Concrete Jacket in Damaged Reinforced Concrete Beams under Monotonic and Repeated Loading

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Constantin E. Chalioris ◽  
Constantin P. Papadopoulos ◽  
Constantin N. Pourzitidis ◽  
Dimitrios Fotis ◽  
Kosmas K. Sideris
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Small Diameter ◽  
Structural Response ◽  
Reinforced Concrete Beams ◽  
Repeated Loading ◽  
Test Results ◽  
Self Compacting Concrete ◽  
Loading Test ◽  
Flexural Response

This paper presents the findings of an experimental study on the application of a reinforced self-compacting concrete jacketing technique in damaged reinforced concrete beams. Test results of 12 specimens subjected to monotonic loading up to failure or under repeated loading steps prior to total failure are included. First, 6 beams were designed to be shear dominated, constructed by commonly used concrete, were initially tested, damaged, and failed in a brittle manner. Afterwards, the shear-damaged beams were retrofitted using a self-compacting concrete U-formed jacket that consisted of small diameter steel bars and U-formed stirrups in order to increase their shear resistance and potentially to alter their initially observed shear response to a more ductile one. The jacketed beams were retested under the same loading. Test results indicated that the application of reinforced self-compacting concrete jacketing in damaged reinforced concrete beams is a promising rehabilitation technique. All the jacketed beams showed enhanced overall structural response and 35% to 50% increased load bearing capacities. The ultimate shear load of the jacketed beams varied from 39.7 to 42.0 kN, whereas the capacity of the original beams was approximately 30% lower. Further, all the retrofitted specimens exhibited typical flexural response with high values of deflection ductility.

scholarly journals Local Behavior of Lap-Spliced Deformed Rebars in Reinforced Concrete Beams

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7186
Author(s):  
Agha Syed Muhammad Gillani ◽  
Seung-Geon Lee ◽  
Soo-Hyung Lee ◽  
Hyerin Lee ◽  
Kee-Jeung Hong
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
American Concrete Institute ◽  
Reinforced Concrete Beams ◽  
Local Behavior ◽  
Test Results ◽  
Loading Test ◽  
Lap Splices ◽  
Lap Splice ◽  
Ductile Behavior

Twelve full-scale reinforced concrete beams with two tension lap splices were constructed and tested under a four-point loading test. Half of these beams had shorter lap splices than that recommended by American Concrete Institute Building Code ACI 318-19; they failed by bond loss between steel and concrete at the lap splice region before rebar yielding. The other half of the beams were designed with a lap splice length slightly exceeding that recommended by ACI 318-19; they failed by rebar yielding and exhibited a ductile behavior. Several strain gauges were attached to the longitudinal bars in the lap splice region to study the local behavior of deformed bars during loading. The strain in a rebar was maximum at the loaded end of the lap splice and progressively decreased toward the unloaded end because the rebar at this end could not sustain any load. Stress flow discontinuity occurred at the loaded end and caused stress concentration. The effect of this concentration was investigated based on test results. The comparison of bond strengths calculated by existing equations and those of tested specimens indicated that the results agreed well.

scholarly journals The SHEAR BEHAVIOR OF REINFORCED CONCRETE BEAMS STRENGTHENED BY CFRP STRIPS

2021 ◽  
pp. 1-9
Author(s):  
Lubna Mohammed Abd
Keyword(s):  
Reinforced Concrete ◽  
Shear Failure ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Experimental Program ◽  
Transverse Reinforcement ◽  
Maximum Deflection ◽  
Modes Of Failure ◽  
Different Shapes ◽  
Combined Failure

   In this research, (12) normal reinforced concrete beams are used with dimensions (110*10*20) cm, the compressive strength for all specimens is 30 MPa. Longitudinal steel is deformed bars 2Ø12mm with Ø6 mm transverse reinforcement which is deformed bars also for different spacing 5 cm, 10 cm and 15 cm. After casting  the specimens and removing them from the molds, they left for about 28 days. They tied by CFRP strips  with different shapes of tying (tied, inclined and X- shaped). They are all testing with two points load by a hydraulic machine for determining (Pu, P cr, maximum deflection and modes of failure) and compared among  their results with the specimens without CFRP strips. From the experimental program, the excellent behavior of the specimens with the X-shaped strips especially with the Pu which is 70% increment and maximum deflection is 39%  decrement. The addition of CFRP strips as a tying material helps to increase the strength of concrete and bearing against loads also, changes and decreases the flexural and shear failure and combined failure.

scholarly journals STUDI PERKUATAN BALOK BETON BERTULANG DENGAN STRAND TANPA PENEGANGAN DAN TULANGAN U

2018 ◽  
Vol 17 (1) ◽  
Author(s):  
Ambar Susanto ◽  
Heri Kasyanto ◽  
Susilahadi Susilahadi
Keyword(s):  
Reinforced Concrete ◽  
Test Specimen ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Reinforced Concrete Beam ◽  
Building Construction ◽  
Reinforced Concrete Beams ◽  
Loading Test ◽  
Yield Force ◽  
Reinforcement Beam

ABSTRACTIncreasing capacity of structures can be done by various methods, one of them is by reinforcing on bridge structure.Reinforcement by using strand has been used on building construction but on reinforced concrete beams because of the problems on it’s execution. The focus of this research is how to install non-stressing strand as reinforcement material.The basic of the research is full-scalled loading test on structure laboratory. There are 2 loading test samples : a sample without reinforcement (Bo) and a sample with reinforcement(B1). The test specimen will be subjected to static monotonic loading until the collapse. The dimensions of the test specimen are 150 x 300 (mm) and the length of the span is 3200 mm.The result of loading for the reinforced concrete beam and reinforcement beam, the yield force value was 22 kN and 27 kN respectively, while deflection value was 9.5 mm and 13 mm respectively.Keywords: beam, reinforcement, strand without stressing, static load.ABSTRAKPeningkatan kemampuan(kapasitas) infrastruktur khususnya jembatan dapat dilakukan dengan berbagai metode, salah satu untuk meningkatkan kemampuan tersebut dengan memperkuat jembatan.Perkuatan menggunakan strand sudah digunakan pada berbagai konstruksi bangunan tetapi untuk balok beton bertulang belum banyak dilakukan karena akan mengalami kesulitan dalam metode pelaksanaan. Sehingga dalam penelitian ini akan mencoba menggunakan metode pemasangan strand tanpa penegangan sebagai bahan perkuatan.Penelitian dilakukan dengan cara pengujian eksperimental di laboratorium dan. Benda uji yang digunakan terdiri dari 2(dua) buah yaitu 1(satu) benda uji balok beton bertulang tanpa perkuatan(Bo) dan 1(satu) buah benda uji balok beton bertulang dengan perkuatan(B1). Benda uji akan dilakukan uji pembebanan statikmonotonik sampai mengalami keruntuhan. Dimensi benda uji 150 x 300 (mm) dan panjang bentang 3200 mm.Dari hasil pengujian terhadap balok beton tanpa perkuatan dan balok perkuatan didapatkan nilai gaya leleh berturut – turut sebesar 22kN dan 27kN serta lendutan berturut –turut sebesar 9.5 mm dan 13 mm.Kata kunci : balok, perkuatan, strand tanpa penegangan, beban statik

Behaviour of Reinforced Concrete Beams Retrofitted With Slurry Infiltrated MAT Continuous Fibre Laminates

2017 ◽  
Vol 7 (3) ◽  
pp. 28
Author(s):  
Rashmi H.S ◽  
Yeshwanth V ◽  
Prahallada M.C. ◽  
◽  
◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Continuous Fibre
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