scholarly journals TINJAUAN RETAK AWAL BALOK BETON BERTULANG YANG DIPERKUAT DENGAN STRAND TANPA PENEGANGAN

2018 ◽  
Vol 17 (1) ◽  
Author(s):  
Heri Kasyanto ◽  
Ambar Susanto ◽  
Susilahadi Susilahadi
Keyword(s):  
Reinforced Concrete ◽  
Research Methodology ◽  
Concrete Beam ◽  
High Strength ◽  
Reinforced Concrete Beam ◽  
Initial Crack ◽  
The Third ◽  
Reinforcement Beam ◽  
Research Show

ABSTRACTReinforcing method of reinforced concrete beam has been done in Indonesia, one of them is by using of strand stressing. Strandstressing need additional technology so that strand reinforcing is not much in demand. Strand has high strength, so using strand needs to be modified in order to take advantage of the material. In this study, the strand will be used to reinforce of reinforced concrete beam by using epoxy and U-steel as anchors.The research methodology based on experimental in the laboratory. The samples are consist of 3 specimens : the first is specimen without using of reinforcement (BU01), the second is specimen with reinforcement by using epoxy and 3 U-steel as anchors(BU02), the third is specimen with reinforcement by using epoxy and 7 U-steel as anchors(BU03). Specimens dimensions of reinforced concrete beam are 150 mm x 300 mm with a span of 3000 mm.The results show that the initial crack occurred in mid span beam on the pull side. The loads causing initial crack as follow: at BU01 = 6.22 kN, at BU02 = 3.95 kN and at BU03 = 0.25 kN. The results research show that initial cracking load of the specimen is inversely proportional with the number of anchor. If the number of anchor is greater, the cracking load will be smaller.Keywords: reinforcement beam, steel of strand, initial crackABSTRAKMetode perkuatan balok beton bertulang sudah banyak dilakukan di Indonesia, salah satunya menggunakan baja strand yang ditegangkan. Penggunaan baja strand sebagai perkuatan masih terbatas dengan melakukan penegangan. Penegangan pada strand memerlukan teknologi tambahan sehingga perkuatan menggunakan strand tidak banyak diminati untuk perkuatan. Mengingat kekuatan strand yang tinggi maka pemanfaatan strand perlu dilakukan modifikasi agar dapat mengambil kelebihan dari material tersebut. Pada penelitian ini pemanfaatan strand digunakan untuk perkuatan balok bertulang tanpa dilakukan penegangan tetapi diikat dengan epoxy dan baja U yang diangkurkan ke balok beton bertulang.Metodologi penelitian yang digunakan menggunakan experimental di laboratorium. Benda uji terdiri dari 3 buah yaitu benda uji normal tanpa menggunakan perkuatan (BU01), benda uji dengan perkuatan strand tanpa penegangan yang diikat dengan epoxy dan 3 baja U yang diangkurkan ke balok beton bertulang (BU02) dan benda uji dengan perkuatan strand tanpa penegangan yang diikat dengan epoxy dan 7 baja U yang diangkurkan ke balok beton bertulang (BU03). Dimensi benda uji balok beton bertulang adalah 150 mm x 300 mm dengan bentang 3000 m.Hasil penelitian menunjukkan bahwa retak awal terjadi di tengah bentang (mid span) balok pada sisi tarik. Beban yang menyebabkan retak awal pada BU01 = 6,22 kN, BU02 = 3,95 kN dan BU03 = 0,25 kN. Hasil tersebut menunjukkan bahwa benda uji yang mempunyai lubang angkur untuk mengikat strand semakin banyak maka beban yang menyebabkan retak awal semakin kecil.Kata Kunci : perkuatan balok, baja strand, retak awal

Reinforced HSC Beams

2014 ◽  
Vol 629-630 ◽  
pp. 544-550
Author(s):  
Nuri Mohamed Elbasha
Keyword(s):  
Reinforced Concrete ◽  
High Strength Concrete ◽  
Concrete Beam ◽  
High Strength ◽  
Reinforced Concrete Beam ◽  
Engineering Properties ◽  
Experimental Program ◽  
Labor Costs ◽  
Dead Load ◽  
Strength Concrete

The primary long and short term advantages of high strength concrete are, low creep and shrinkage, higher stiffness, higher elastic modulus, higher tensile strength, higher durability (resistance to chemical attacks) and higher shear resistance. In addition, high strength concrete reduces the size of the member, which in turn reduces the form size, concrete volume, construction time, labor costs and dead load. Reducing the dead load reduces the number and size of the beams, columns and foundations. Thus there is a positive impact on reduction of maintenance and repair costs and an increase in rentable space. Other, yet to be discovered advantages may also exist. High strength concrete has definite advantages over normal strength concrete. The ductility of over reinforced HSC beams is enhanced through the application of helical reinforcement located in the compression region. The pitch of helix is an important parameter controlling the level of strength and ductility enhancement. This paper presents an experimental investigation of the effect of helices on the behavior of over reinforced high strength concrete beams through testing ten helically confined full scale beams. The helix pitches were 25, 50, 75, 100 and 160 mm. Beams’ cross section was 200×300 mm, and with a length of 4 m and a clear span of 3.6 m subjected to four point loading. The main results indicate that helix effectiveness is negligible when the helical pitch is 160 mm (helix diameter). The experimental program in this study proved that the HSC, HSS and helical confinement construct a reinforced concrete beam. This beam has the ability to resist weathering action and chemical attack while maintaining its desired engineering properties. In near future Reinforced High Strength Concrete Beam with Helical Confinement will be considered as a durable and sustainable Reinforced Concrete Beam.

scholarly journals Studies on nonlinear behavior of retrofitted reinforced concrete beam column joints after experiencing severe damage from earthquake load simulation

2019 ◽  
Vol 270 ◽  
pp. 01006
Author(s):  
Nelson Gosal ◽  
Iswandi Imran ◽  
Muhammad Riyansyah
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Loading ◽  
Concrete Beam ◽  
Nonlinear Behavior ◽  
High Strength ◽  
Reinforced Concrete Beam ◽  
Severe Damage ◽  
Earthquake Load ◽  
Energy Dissipated ◽  
Load Simulation

For an earthquake resistant structure, reinforced concrete building must have certain performance level under certain level of earthquakes such as when it is subjected to a strong level earthquake, it may experience severe damages, but without partial or full collapse, thus some reparations could be done to recover the functions of those damaged structures. However, repairing methods were usually done to slightly-damaged structures, while for severely-damaged structures, more studies are still needed to optimize the effectivity of the repair. Therefore, the objective of this study is to evaluate the performance of a structure that is retrofitted using high strength concrete after experiencing severe damage from an earthquake. Reinforced concrete beam column joints - that are used as specimens for this study - were initially subjected to cyclic loading up to 5% drift. The specimens’ beams are then repaired by replacing the damaged concrete with the new, stronger concrete without replacing the existing reinforcement bars. The retrofitted specimens are then subjected to the same cyclic loading and their nonlinear behaviors are compared to the behavior of their initial condition. The experimental results show that there are mostly reductions in lateral strengths, although there is an increase of strength in one specimen, while there are also reductions in energy dissipated.

Study on Anti-Explosion Behavior of High-Strength Reinforced Concrete Beam Under Blast Loading

2019 ◽  
Vol 51 (6) ◽  
pp. 926-938
Author(s):  
Z. Liao ◽  
Z. Z. Li ◽  
Y. L. Xue ◽  
L. Z. Shao ◽  
D. P. Yang ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Blast Loading ◽  
High Strength ◽  
Reinforced Concrete Beam

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

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 Application of high strength reinforcing bars in earthquake-resistant structure elements

2018 ◽  
Vol 195 ◽  
pp. 02015
Author(s):  
Kurniawan Setiadi Kamaruddin ◽  
Iswandi Imran ◽  
Maulana Derry Imansyah ◽  
Muhammad Riyansyah ◽  
Aris Ariyanto
Keyword(s):  
Reinforced Concrete ◽  
Yield Strength ◽  
Concrete Beam ◽  
High Strength ◽  
Reinforced Concrete Beam ◽  
Reinforcing Bars ◽  
Dissipation Energy ◽  
Reinforcing Bar ◽  
Column Joint ◽  
Normal Strength

Currently, design of reinforced concrete buildings is still dominated with normal strength reinforcing bars, not exceeding 420 MPa yield strength. Meanwhile, the use of higher strength reinforcing bars tend to increase due to some benefits in the construction, such as reducing the total weight of reinforcing bars and alleviating reinforcing bars congestions. In this study, reinforcing bars with yield strength of 520 MPa are utilized in the reinforced concrete beam-column joint. The objective is to study the seismic performance of reinforced concrete beam-column joints. A total of 3 interior beam-column joints, half-scaled specimens with different yield strengths and bar diameters was tested. One of the test specimens which was 16 mm diameter and had normal strength reinforcing bar. The other two specimens use high strength reinforcing bars, and have 16 mm and 19 mm diameter bars. Loading protocol of all the specimens is conformed with ACI 374.2. Dissipation energy and deformability of the joints is then compared. Normalized energy dissipation of the specimens with high strength reinforcing bars was slightly lower than that of the specimens with normal reinforcing bars. However, specimens with high strength reinforcing bars tend to have smaller deformability than that of the specimens with normal reinforcing bars.

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