scholarly journals Structural and physical evaluation of a reinforced beam using strain gauges

2022 ◽  
Vol 2153 (1) ◽  
pp. 012003
Author(s):  
N Afanador-Garcia ◽  
G Guerrero-Gomez ◽  
R Gallardo-Amaya

Abstract In this research project,the deformations in the longitudinal and transverse reinforcing steel of a reinforced concrete beam with 2ϕ½” were estimated.Additionally,the displacements in thecenter of thespanweremeasuredtogether with theloads, which generatedthecrackingof the beam of dimensions180 mm×240 mm×3100 mm.Displacement were performed using a linear variable displacement transducer, and strain gauges were used to measure deformations. Finally, the applied load’s measurements were obtained with a load cell Pinzuar/Model-100/20T equipment.The physical-mechanical properties of the concreteused were determined through compressive strength tests at 28 days and modulus of elasticity.For this purpose, a load-bearing frame was used to support the beam at three points for load application.The data was collected directly on the Quantum/X2 equipment and analyzed with the help of the Catman/AP software.The maximum deformations found in the bending test at three point since there inforced concrete beam we are not greater than 8483µm/mm,presenting a failure in the center of the beam due to the creep of the tensile steel for a maximum load of 3115 Kg.Finally,the physical behavior of there inforced concrete beam with applying aload allows evaluating and optimizing this kind of systems.

2019 ◽  
Vol 97 ◽  
pp. 03008 ◽  
Author(s):  
Dorota Marcinczak ◽  
Tomasz Trapko

The article presents tests of a reinforced concrete beam strengthened in a shear with PBO-FRCM composite materials. Measurement of the deformation of the composite was carried out using two methods - with strain gauges and the optical DIC method (Digital Image Correlation). The DIC method consists in taking a series of photographs of the tested object before and during loading. The surface of the tested element must have randomly spaced spots that are applied to the object before measurement. During the study, the cameras monitor the shifting of spots against each other, which in comparison to the reference image before loading gives information about strains and stresses of the tested element. Measurements of deformation of composite materials using strain gauges are difficult to clearly analyse, because the strain gauge is in a specific, limited place, which does not correspond to the work of the entire composite. In addition, the strain gauge tends to break at the place of crack. The article discusses this problem by presenting the results of deformation of PBO-FRCM composite meshes measured in two mentioned ways, their comparison and discussion of results.


2015 ◽  
Vol 8 ◽  
pp. 148-154 ◽  
Author(s):  
Carlos Guzmán ◽  
Darío Torres ◽  
Cynthia Hucailuk ◽  
Dino Filipussi

BUILDER ◽  
2019 ◽  
Vol 259 (2) ◽  
pp. 66-68
Author(s):  
Dorota Marcińczak

DIC (DIGITAL IMAGE CORRELATION) METHOD IN THE RESEARCH OF RC BEAMS STRENGTHENED WITH PBOFRCM MATERIALS. The article presents tests of a reinforced concrete beam strengthened in a shear with PBO-FRCM composite materials. Measurement of the deformation of the composite was carried out using two methods - with strain gauges and the optical DIC method (Digital Image Correlation). The DIC method consists in taking a series of photographs of the tested object before and during loading. The surface of the tested element must have randomly spaced spots that are applied to the object before measurement. During the study, the cameras monitor the shifting of spots against each other, which in comparison to the reference image before loading gives information about strains and stresses of the tested element. Measurements of deformation of composite materials using strain gauges are difficult to clearly analyze, because the strain gauge is in a specific, limited place, which does not correspond to the work of the entire composite. In addition, the strain gauge tends to break at the place of crack. The article discusses this problem by presenting the results of deformation of PBO-FRCM composite meshes measured in two mentioned ways, their comparison and discussion of results.


2016 ◽  
Vol 14 (1) ◽  
pp. 1
Author(s):  
Agostinho Francisco Pinto ◽  
Sri Murni Dewi ◽  
Devi Nurlinah

Need for the use of reinforced concrete in housing construction will increase along with the rapid population growth. This increases the need for steel reinforcement as a major component. The increase in need for steel reinforcement will trigger a price increase so that it becomes expensive and scarce. Iron ore as a raw material for making steel reinforcement is a mineral that can not be renewed. Therefore, efforts to use alternatives to steel reinforcement in concrete. Bamboo has good mechanical properties and a high ratio between strength and weight. Bamboo has a tensile strength is high, between 100-400 MPa, nearly matching the tensile strength equivalent to steel reinforcement ½ to ¼ of iron ultimate voltage (Widjaja, 2001) and (Surjokusumo and Nugroho, 1993) showed similar results and by the Moriscos, 1996 that the tensile strength of bamboo can reach 1280 kg / cm2. Bamboo can be used as the material of reinforced concrete. This study aims to determine the capacity of the bending beam with reinforcement of bamboo, bamboo reinforced beam deflection capacity. This experiment is a concrete beam bending test. The results showed that bamboo reinforced concrete beam has a maximum capacity reached 56.61% of the maximum capacity of steel reinforced concrete.


2012 ◽  
Vol 166-169 ◽  
pp. 712-715
Author(s):  
Seung Joe Yoon ◽  
Soo Yeon Seo

This research is aimed at evaluating pull-out capacity through the pull-out test of the reinforced headed bar, a mechanical anchorage, that can replace standard hook. The reason for the weak standard hook making congestion of bars of beam, which is a problem of the reinforced concrete beam-column joint so that it causes the stress concentration inside the joint. As the variables for this test, the hook type that anchored the reinforced headed bar at the beam-column joint, hoop-reinforced type, and the transverse reinforcement type were selected. The researcher analyzed fracture pattern of the test specimens regarding each variable, and the deformation pattern according to load as well. The results from the comparison of the specimens according to the type of laterally confined bar revealed that, though the type of longitudinal bar and of hoop reinforcement were identical, the yield and maximum load of the test specimen of which type of the laterally confined bar was a cross was high as much as 8% and 9% respectively.


2017 ◽  
Vol 6 (1) ◽  
pp. 8
Author(s):  
Agus Maryoto ◽  
Sugeng Waluyo ◽  
Yanuar Haryanto ◽  
Nor Intang Setyo Hermanto

The waste tire is produced more than 10 million tons every year in the world. This problem needs serious treatment to eliminate the waste tires. This work is aimed to recycle the waste tire in concrete as a reinforcement. The contribution of the waste tires in flexural strength capacity of concrete is investigated by using experimental work and numerical simulation. Since material is quite non-homogenous compared to the pure concrete, we use six concrete beam specimens with dimension 150 mm x 150 mm x 1000 mm to get better fitting results. One specimen is non reinforced concrete beam and five specimens are waste tires reinforced concrete beam. For each of the five specimen, the waste tire reinforcement is tensioned with 0%, 17%, 25%, 40% and 60% strain before casting the concrete. The flexural strength tests are conducted after 28 days concrete ages under three point loadings. After the test, we observe that the waste tire reinforcement together with pre-stress contribute significantly on the flexural strength of the concrete beam as predicted. Finally, to support the test, finite element analysis is performed as well in this work and compared with the experimental results.


2018 ◽  
Vol 1 (4) ◽  
pp. 877-884
Author(s):  
Yarmiza Anggriyani Fitri ◽  
Teuku Budi Aulia ◽  
Taufiq Saidi

Abstract: The development and progress of the world quite rapidly accrue followed by a large number of the population led to an increase in the outstanding in the use of concrete. Concrete is widely used in the construction of the building works and means of transportation such as bridges, highways and other worksBasically the concrete has a high compressive strength, but had the ability to wiht stand the tensile and shear forcew low. This can be fixed by added a fibber on mortar concrete.  The addition of fiber for decreasing the brittle and improving the survival of crack early (first crack) is a concrete it can be reached by adding polypropylene fiber, bendrat wire fiber and rubber tiress fiber. The purpose of this research is to observe the shear behavior of reinforced concrete beam  with fiber is polypropylene fiber (PP), bendrat wire fiber and used rubber tiress. In this study 4 beams tested with measuring 15 x 30 x 220 cm each fiber type has a beam specimen and a beam specimen without the addition of fiber. Specimens designed for shear failure. The result showed all the beams are having shear failure as planned. Cement water factor (FAS) 0.25, bendrat wire fiber with a percentage of 2% of the volume of the concrete. The results showed a beam experiencing failed to slide as planned. The test results showed a beam BMT with the addition of fiber has a maximum load 26.03 tonnes, the first cracks occur on the load 5.10 tons. Beam with wire bendrat maximum load wire BMT 27.41 T, the first cracks occur on the load 5.90 T. For the magnitude of the shear style capacity contributed by shear reinforcement constann for all beams this is 1.653 T, while for a capacity of sliding style concrete donated by each to BMT fiber without adding Vc = 4.52 T and fiber wire bendrat BMT value of Vc = 4.55 T. Abstrak: Perkembangan dan kemajuan dunia yang cukup pesat diikuti dengan bertambah banyaknya jumlah penduduk mengakibatkan terjadinya peningkatan yang menonjol dalam penggunaan beton. Beton digunakan secara luas pada pekerjaan-pekerjaan pembangunan gedung dan sarana-sarana transportasi misalnya jembatan, jalan raya serta pekerjaan-pekerjaan lainnya. Pada dasarnya beton memiliki kuat tekan yang tinggi, tetapi memiliki kemampuan menahan gaya tarik dan gaya geser yang rendah. Hal ini dapat diperbaiki dengan menambahkan serat pada adukan beton. Penambahan serat untuk mengurangi sifat getas dan meningkatkan ketahanan retak awal (first crack) beton yang dapat ditempuh salah satunya dengan menambahkan serat kawat bendrat, dan serat karet ban bekas dalam campuran beton. Tujuan dari penelitian ini adalah untuk mengamati perilaku geser balok beton bertulang mutu tinggi (BMT)  menggunakan serat kawat bendrat. Pada pengujian ini diuji  dua balok berukuran 15 x 30 x 220 cm, dengan satu balok tanpa penambahan serat dan satu balok jenis serat sebanyak satu benda uji didesain mengalami gagal geser. Faktor air semen (FAS) 0,25 serat kawat bendrat dengan persentase 2% dari volume beton. Hasil penelitian menunjukkan balok mengalami gagal geser sesuai yang direncanakan. Hasil pengujian menunjukkan balok BMT dengan penambahan serat memliki beban maksimum 26,03 ton, retak pertama terjadi pada beban 5,10 ton. Balok BMT kawat bendrat beban maksimumnya 27,41 ton, retak pertama terjadi pada beban 5,90 ton. Untuk besarnya kapasitas gaya geser yang disumbangkan oleh tulangan geser konstann untuk semua balok yaitu 1,653 ton, sedangkan untuk kapasitas gaya geser yang disumbangkan oleh beton masing- masing untuk BMT tanpa penambahan serat Vc = 4,52 ton dan beton BMT serat kawat bendrat nilai Vc = 4,55 ton.


Sign in / Sign up

Export Citation Format

Share Document