scholarly journals DISTRIBUSI GESER DALAM PADA BALOK BETON BERTULANG MUTU TINGGI DENGAN PENAMBAHAN SERAT KAWAT BENDRAT

2018 ◽  
Vol 1 (4) ◽  
pp. 877-884
Author(s):  
Yarmiza Anggriyani Fitri ◽  
Teuku Budi Aulia ◽  
Taufiq Saidi
Keyword(s):  
Concrete Beam ◽  
Shear Failure ◽  
Fiber Type ◽  
Polypropylene Fiber ◽  
Maximum Load ◽  
Reinforced Concrete Beam ◽  
Beam Specimen ◽  
Test Results ◽  
Water Factor ◽  
The World

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.

scholarly journals SHEAR STRENGTHENING OF REINFORCED CONCRETE BEAM USING EXTERNALLY STRIRRUPS

2019 ◽  
Vol 3 (2) ◽  
pp. 105
Author(s):  
Arga Saputra ◽  
Sri Murni Dewi ◽  
Lilya Susanti
Keyword(s):  
Concrete Beam ◽  
Shear Failure ◽  
Reinforced Concrete Beam ◽  
Shear Capacity ◽  
Crack Pattern ◽  
Test Results ◽  
Shear Cracks ◽  
Shear Strengthening ◽  
Shear Area ◽  
Calculation Analysis

Initial design errors, especially the installation of stirrups, one of them can cause the beam having shear failure due to installing capacity of stirrups less than the shear capacity that occurs. Shear strengthening in this study used externally stirrups ∅6-75 which were installed in the shear area only. The results of calculation analysis, shear capacity can increase up to 137.82%; 133.42% and 137.12% while the test results increased by 31.58%; 0% and 4.76% in this caseload did not look significant from the results of calculation analysis. However, when viewed from crack pattern that occurs without external stirrups, outer ring has a combination of flexural and shear cracks occurs quite much, besides of flexural and shear cracks, combination of crack also occurs because of pressure beam reach pressure capacity first rather than tensile beam because the ratio of installed reinforcement is over reinforced. Meanwhile, in the beam with external stirrups, the crack pattern that occurs is also a combination of bending and shear cracks, but the cracks that occur are relatively less than the beam without external stirrups. When viewed from the deflection that occurred during the first crack, the reinforced beam experienced a relatively smaller deflection of 0.61 mm beam; 0.31 mm and 0.18 mm rather than beams without externally stirrups 1.28 mm; 0.55 mm and 0.32 mm, so that the beam with external stirrups can be said to be more rigid than the beam without external stirrups. Kesalahan desain awal, khususnya pemasangan sengkang, salah satunya dapat mengakibatkan balok mengalami kegagalan geser akibat kapasitas sengkang yang terpasang kurang dari kapasitas geser yang terjadi. Perkuatan geser pada penelitian ini menggunakan sengkang ∅6-75 yang dipasang pada daerah geser saja. Hasil dari perhitungan analisis, kapasitas geser dapat meningkat sampai 137,82%; 133,42% dan 137,12% sedangkan dari hasil pengujian mengalami peningkatan sebesar 31,58%; 0% dan 4,76% dalam hal ini peningkatan beban tidak terlihat sesignifikan dari hasil analisis perhitungan, namun jika dilihat dari pola retak yang terjadi beton tanpa perkuatan sengkang luar mengalami kombinasi retak lentur dan geser yang cukup banyak, selain kombinasi retak lentur dan geser, juga terjadi retak akibat balok tekan yang mencapai kapasitas tekan terlebih dahulu daripada balok tarik karena rasio tulangan yang terpasang over reinforced. Sementara itu pada balok dengan perkuatan sengkang luar, pola retak yang terjadi juga kombinasi retak lentur dan retak geser, namun retak yang terjadi relatif lebih sedikit daripada balok tanpa perkuatan. Jika ditinjau dari lendutan yang terjadi pada saat crack pertama, balok yang diberi perkuatan mengalami lendutan yang relatif lebih kecil yaitu 0,61 mm; 0,31 mm dan 0,18 mm daripada balok tanpa perkuatan 1,28 mm; 0,55 mm dan 0,32 mm sehingga balok yang diperkuat dengan sengkang luar dapat dikatakan lebih kaku daripada balok tanpa perkuatan.

scholarly journals PERILAKU GESER BALOK BETON BERTULANG MUTU TINGGI DENGAN VARIASI FLY ASH BATU BARA, PASIR POZZOLAN DAN BONGKAHAN CANGKANG SAWIT

2020 ◽  
Vol 3 (4) ◽  
pp. 268-277
Author(s):  
Cut Fatmawati ◽  
Teuku Budi Aulia ◽  
Muttaqin Muttaqin
Keyword(s):  
Reinforced Concrete ◽  
Fly Ash ◽  
High Strength Concrete ◽  
Concrete Beam ◽  
Shear Failure ◽  
High Strength ◽  
Maximum Load ◽  
Reinforced Concrete Beam ◽  
High Quality ◽  
Flexural Tensile Strength

The utilization of high strength concrete particularly on construction is an option in structural elements. High Strength Concrete (BMT) is a compressive strength exceeding 6000 psi or 41 MPa. High quality concrete can be obtained by mixing superplasticizers (high range water reducers) and cementitious mineral additives in the form of fly ash, pozzofume (super fly ash), and microscopy (silicafume). In this study, it will used the substitution of cement material using coal fly ash, fly ash pozzolan sand and palm shell ash fly ash, fine aggregates using pozzolan sand, coarse aggregates palm shell. The aim of this study is to compare the shear behavior of normal high quality reinforced concrete beams and beams with the addition of material substitution. The high quality reinforced concrete beam specimens were designed to experience shear failure by strengthening the bending area. Reinforced concrete beam specimens of beam size 150 mm x 300 mm x 2200 mm with shear reinforcement diameter 6 mm (fy) 423.46 MPa, compressive reinforcement 16 mm (fy) 412.39 MPa and tensile reinforcement 19 mm (fy) 462, 24 MPa. The beam specimen is pure flexural tensile strength with a size of 150 mm x 150 mm x 600 mm and a cylindrical specimen with a diameter of 150 mm x 300 mm in height. The magnitude of the flexural tensile strength for BMT-N with f cc = 44.4 MPa is 4.5, and for BMT-FBPP with f cc = 51.04 MPa which is 5.35 with FAS 0.3. The results of the two beams experienced shear failure, with a comparison of laboratory and theoretical shear capacity of 2,292 BMT-N with a maximum load of 27,200 MPa, BMT-FBPP 1,720 with a maximum load of 21,410 MPa. The values of deflection and ductility tend to decrease in BMT-FBPP beams which are equal to 19.780% and 6%.

scholarly journals Influence of stirrup spacing on shear resistance and deformation of reinforced concrete beams

2018 ◽  
Vol 7 (1) ◽  
pp. 126
Author(s):  
Latha M S ◽  
Revanasiddappa M ◽  
Naveen Kumar B M
Keyword(s):  
Concrete Beam ◽  
Concrete Beams ◽  
Bending Moment ◽  
Maximum Load ◽  
Reinforced Concrete Beams ◽  
Test Results ◽  
Cement Concrete ◽  
Simply Supported ◽  
Reinforced Cement ◽  
Flexural Reinforcement

An experimental investigation was carried out to study shear carrying capacity and ultimate flexural moment of reinforced cement concrete beam. Two series of simply supported beams were prepared by varying diameter and spacing of shear and flexural reinforcement. Beams of cross section 230 mm X 300 mm and length of 2000 mm. During testing, maximum load, first crack load, deflection of beams were recorded. Test results indicated that decreasing shear spacing and decreasing its diameter resulted in decrease in deflection of beam and increase in bending moment and shear force of beam.

scholarly journals Numerical Simulation on Reinforced Concrete Beam with Different Cover Size under Two Point Bending Load

2021 ◽  
Vol 7 (05) ◽  
pp. 39-43
Author(s):  
R Padma Rani & R Harshani
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Structural Analysis ◽  
Concrete Beam ◽  
Failure Modes ◽  
Equivalent Stress ◽  
Reinforced Concrete Beam ◽  
Simulation Software ◽  
Beam Specimen ◽  
Bending Load

Structural analysis is used to assess the behavior of engineering structures under the application of loads. Usually, structural analysis methods include analytical,experimental and numerical methods is used in thisproject, however, only Analytical method is used and the values are taken from literature reference, to get familiar with Finite Element Analysis (FEA) using ANSYS, this is done to acquire practical knowledge about of the effect of the cover. The aim is to identify different failure modes under a range of loading conditions by changing the cover size to get the data of various parameters such as deflection, stress etc. Study of cover helps to observe the stability, reliability and the overall strength of the structural beam. This project attempts made to study the effect of cover on the behavior of reinforced concrete beam. Forthis analytical study, the Reinforced concrete beam specimen of 2000x100x200mm was considered.ANSYS software is a suite of engineering simulation software, based on finite element method, which can solve problems ranging from linear analysis to nonlinear analysis. The Doubly reinforced beams weremodeled by using geometry. In this model,various covers are provided. The beam specimensused in this study were tested under two-point static loading condition until failure of the specimen. From theobtained resultconcluded that the total deformation and directional deformation values are low in 25mm cover compared to other cases but the equivalent stress value is low in 35mm cover size compared to 25mm cover size.

Shear Failure of Patched Reinforced Concrete Beam without Web Reinforcements

2017 ◽  
Vol 737 ◽  
pp. 441-447 ◽  
Author(s):  
Stefanus Kristiawan ◽  
Agus Supriyadi ◽  
Senot Sangadji ◽  
Hapsara Brian Wicaksono
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Shear Failure ◽  
Unsaturated Polyester ◽  
Reinforced Concrete Beam ◽  
Concrete Cover ◽  
Patch Repair ◽  
Rc Beam ◽  
Diagonal Crack ◽  
The Web

Degradation of reinforced concrete (RC) element could lead to a reduction of its strength and serviceability. The degradation may be identified in the form of spalling of concrete cover. For the case of RC beam, spalling of concrete cover could occur at the web of the shear span due to corrosion of the web reinfocements. The shear strength of the damaged-RC beam possibly will become less conservative compared to the corresponding flexural strength with a risk of brittle failure. Patch repair could be a choice to recover the size and strength of the damaged-RC beam. This research investigates the shear failure of patched RC beam without web reinforcements with a particular interest to compare the shear failure behaviour of patched RC beam and normal RC beam. The patch repair material used in this research was unsaturated polyester resin (UPR) mortar. The results indicate that the initial diagonal cracks leading to shear failure of patched RC beam occur at a lower level of loading. However, the patched RC beam could carry a greater load before the diagonal crack propagates in length and width causing the beam to fail in shear.

Study on Impaired Reinforced Concrete Beams Strengthening with Externally Steel Frame

2013 ◽  
Vol 438-439 ◽  
pp. 477-481
Author(s):  
Feng Lan Li ◽  
Xiong Huai Yu ◽  
Cheng Chen ◽  
Song Chen
Keyword(s):  
Reinforced Concrete ◽  
Cross Section ◽  
Concrete Beam ◽  
Steel Plate ◽  
Reinforced Concrete Beam ◽  
Steel Frame ◽  
Reinforced Concrete Beams ◽  
Test Results ◽  
Externally Bonded ◽  
Strengthening Method

A large impaired reinforced concrete beam with cracks was strengthened under self-weight action by the externally bonded steel frame composed with bottom steel plate and side hoop steel belts. The normal service loading behaviors of this beam were tested to verify the effectiveness of this strengthening method specified in current Chinese design code. Based on the analyses of test results, it can be concluded that: the deformation of flexural cross section of this beam fitted the assumption of plain cross section, the steel plate could effectively enhance the flexural stiffness and decrease the deflection of this beam, no new cracks appeared under the normal service loads, the cracks at bottom of this beam were more confined by the steel frame than those at web zone. Therefore, other measure should be taken to avoid the opening of web cracks.

scholarly journals Studi Kapasitas Lendutan, Daktalitas, dan Kekakuan pada Balok Beton Bertulang yang Diperkuat GFRP-S dengan Perendaman Air Laut Selama Satu Tahun

2019 ◽  
Vol 5 (2) ◽  
pp. 112
Author(s):  
Asri Mulya Setiawan ◽  
Erniati Bachtiar
Keyword(s):  
Test Object ◽  
Concrete Beam ◽  
Sea Water ◽  
Water Immersion ◽  
Reinforced Concrete Beam ◽  
Test Method ◽  
The Other ◽  
Test Results ◽  
Loading Method ◽  
Simple Supports

This study aims to analyze the deflection capacity, ductality and stiffness of reinforced concrete beam structures reinforced by GFRP with sea water immersion for 1 year. The test method used is a monotonic loading method that uses two simple supports over the test object and is pressed at a constant ramp actuator speed of 0.05 mm / sec until the concrete beam fails. The test results show that BF0 is more ductile compared to BF6 and BF12. This can be seen the existing deflection, where BF0 has a deflection that tends to be larger than the other beams. In BF0 specimens, the load that is able to hold is greater than BN specimens, but the resulting deflection is also greater

scholarly journals Effect of Stirrup Spacing and Polypropylene Fiber Ratio on Behavior of Reinforced Concrete Beams

2021 ◽  
Author(s):  
Alptuğ Ünal ◽  
Salih Cengiz ◽  
Mehmet Kamanlı
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Polypropylene Fiber ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Beam Depth ◽  
Bending Capacity ◽  
Bending Mechanism

In this study, the effect of the change of stirrup ratio and polypropylene (PP) fiber ratio on the behavior of reinforced concrete beams was investigated. The variables of this study consisting of without stirrup, spacing up to 20 %, 40 % and 80 % of beam depth as stirrup spacing and 0.125 % and 0.500 % of the weight of reinforced concrete beam were used as PP fiber ratios. In the context of experimental study, 1/2 scaled 12 reinforced concrete beams were tested with 4-point bending mechanism. In the light of the obtained data, the load-displacement, stiffness and energy absorption graphs were plotted. The results were interpreted comparatively. According to the results, it is observed that the PP fiber additive significantly changed the behavior of the reinforced concrete beams, and the fiber effect decreased in proportion to the increase of the stirrup rate. It has been observed that the cracks spread more to the beam surfaces with the increase of PP fibers. In addition, the increase in the fiber ratio especially in the non-stirrup beams increases the bending capacity.

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