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KAPASITAS LENTUR BALOK BETON BERTULANG DENGAN SERAT SABUT KELAPA Apriyatno, Henry
Jurnal Teknik Sipil dan Perencanaan Vol 15, No 1 (2013): Jurnal Teknik Sipil & Perencanaan
Publisher : Semarang State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jtsp.v15i1.7113

Concrete has a weakness in its tensile strength and easily broken so that the concrete cross-sectional area of capacity planning appeal is not taken into account. The weakness of concrete can be improved by increasing the fiber that has a purpose as concrete reinforcement fibers uniformly. The fiber used is coco fiber length of 8 cm in the composition of 0%, 1%, 1:33%, 2% and 4% of the volume of concrete. Mechanical changes of concrete obtained from concrete test cylinders and pure bending concrete beams measuring 15 cm x 20 cm x 110 cm at the optimum composition of the fiber to the concrete. The results showed the addition of fiber causes the concrete cylinder press capacity was significantly increased by 5.583% as well as the tensile strength of concrete rose by an average of 5.225%. Ductility properties of concrete increased significantly while the modulus of elasticity of concrete is significantly decreased, the bending capacity of the beam used pure bending optimum composition of 1% of the volume of concrete with fiber deployment 12:25 h and 0.5 h obtained the best results with an average increase of 6.65%.Beton memiliki kelemahan pada kuat tarik dan sifat getasnya rendah (mudah putus) sehingga dalam perencanaan kapasitas tampang beton daerah tarik tidak diperhitungkan. Kelemahan beton dapat diperbaiki dengan menambah serat yang memiliki tujuan menulangi beton dengan serat secara uniform. Serat yang dipakai adalah serat sabut kelapa panjang 8 cm pada komposisi 0%,1%,1.33%,2% dan 4% dari volume beton. Perubahan mekanis beton diperoleh dari uji silinder beton dan balok beton lentur murni berukuran 15 cm x 20 cm x 110 cm pada komposisi optimum serat terhadap beton. Hasil penelitian menunjukkan dengan penambahan serat menyebabkan kapasitas tekan silinder beton secara signifikan naik sebesar 5,583% demikian juga kuat tarik beton naik rata-rata sebesar 5,225%. Sifat daktailitas beton meningkat secara signifikan sedangkan modulus elastisitas beton secara signifikan menurun, kapasitas lentur balok lentur murni dipakai komposisi optimum 1% serat terhadap volume beton dengan penyebaran 0.25 h dan 0.5 h diperoleh hasil yang paling baik dengan peningkatan rata-rata sebesar 6,65%..

KAPASITAS LENTUR BALOK BETON BERTULANG DENGAN POLYPROPYLENE FIBER SEBESAR 6% DARI BERAT SEMEN Apriyatno, Henry
Jurnal Teknik Sipil dan Perencanaan Vol 11, No 2 (2009): Jurnal Teknik Sipil & Perencanaan
Publisher : Semarang State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jtsp.v11i2.1723

The addition of fiber (fiber) in the concrete mixture is to debone the concrete where thefiber is spread evenly into the concrete mixture with random orientation, so as to prevent theoccurrence of micro cracks. The addition of polypropylene fiber is intended to support the internalstresses (axial, bending and shear) is greater. The study aims to determine the flexural capacity ofconcrete beams reinforced with polypropylene fiber at 6% of cement weight. Split tensile strength ofconcrete will increase by approximately 36.78%, while the modulus of elasticity of a decline, adecline of about 5.4% of conventional concrete. Strong increase in the beam line optimally will beobtained when the fiber concrete is placed only partially in the appeal, the proportion of 75% of thetotal look of the block .. Increased flexibility of polypropylene fiber beam 22.6% for the BPF-100,BPF-75, BPF-50, and increased 9.7% for BPF-25 than normal concrete.Â Penambahan serat (fiber) pada adukan beton adalah menulangi beton dimana fiberdisebarkan secara merata kedalam adukan beton dengan orientasi acak, sehingga dapatmencegah terjadinya retakan mikro. Penambahan polypropylene fiber dimaksudkan dapatmendukung tegangan-tegangan internal (aksial, lentur dan geser) yang lebih besar. Penelitianbertujuan untuk mengetahui kapasitas lentur balok beton bertulang dengan polypropylene fibersebesar 6% dari berat semen. Kuat tarik belah beton akan meningkat sekitar 36,78 %, sedang nilaimodulus elastisitas terjadi penurunan, penurunan sekitar 5,4 % dari beton konvensional.Peningkatan kuat batas balok secara optimal akan diperoleh bila beton fiber hanya ditempatkansecara parsial pada bagian tarik, proporsi 75 % dari luas tampang balok.. Peningkatan kelenturanbalok polypropylene fiber sebesar 22,6 % untuk BPF-100, BPF-75, BPF-50, dan meningkat 9,7%untuk BPF-25 dibandingkan beton normal.

Analysis Effect of Variation Form and Dimension on Structure Reinforced Concrete Column in Kali Kendeng Bridge Dewantara, Kandida Rahardian; Apriyatno, Henry; Narendra, Alfa; Taveriyanto, Arie
Jurnal Teknik Sipil dan Perencanaan Vol 22, No 1 (2020)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jtsp.v22i1.21013

Abstract. Square columns is a rectangular column which has a single stirrup shape and wide distances in - between. In addition, the round column is a column with a spiral section and has a relatively short distance or a relatively smaller distance in - between. Parameters in column planning include reinforcement requirements, column slenderness, buckling factors, interaction diagrams, and ductility. The study used existing rectangular column data with dimensions of 3.5x3.5 m from Kali Kendeng Bridge in the Semarang-Surakarta Toll Road Construction Project. From the field data, variations in the shape of the columns became rounded columns by calculating the moment of inertia of the two cross sections. Variations in dimensions was performed by calculating reinforcement ratio requirements, aiming to produce an effective column design. The first step is to analyze the bridge loading with earthquake loading SNI for the 2833: 2016 bridge and SNI loading for the bridge 1725: 2016. After that, do the calculation of reinforced concrete column requirements and be checked through the SAP2000 application. Then analyze SAP2000 output, so that the moment and shear forces are obtained in square and round columns. Then with the same material that is 30 MPa quality concrete and 390 MPa quality steel, the results obtained slenderness, bending factor and the radius of inertia between square and round columns are the same. The maximum moment value in a square column is 60704.8718 kN-m and the maximum shear is 2358.14 kN. In addition, the round column obtained a maximum moment of 60685.1944 kN-m and a maximum shear of 2358.65 kN. An overview of the relative ductility aspect of 2.7 kN between square and round columns and the ductility value shows the reduced cross-sectional area the smaller the ductility value. Therefore, it is concluded that a round column is better in terms of holding moment and sliding, than a square shaped column.

PENGARUH PENAMBAHAN SERAT ROVING TERHADAP KAPASITAS LENTUR BALOK BETON BERTULANG Apriyatno, Henry
Jurnal Teknik Sipil dan Perencanaan Vol 9, No 2 (2007): Jurnal Teknik Sipil & Perencanaan
Publisher : Semarang State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jtsp.v9i2.1616

Concrete is enervating the strength of pull and it is brittle in nature (it is tragile) that in aconstruction design the capacity of longitudinal concrete tension area is not computered. Theenervating concrete can be fixed by adding some fibres with the purpose to erect the concreteframe uniformly. Roving fibers are used at the composition of 1.9; 3.8; 5.7; and 7. 6% of theconcrete volume. The concrete mechanical change is determined by a concrete cylinder andconcrete block measuring 15cm x 20cm x 120cm put to experiment with their respective 15experimental objects. Refracted capacity experiment is gained from a chaste refracted block. Theresearch result shows that the fibre accretion to concrete causes the pressure capacity of concretecylinder to decrease significantly, whereas the strong pull of concrete increases. The concreteductility significantly increases, whereas the modular concrete elasticity significantly decreases, thecapacity of refracted block at the fibre compositions of 1.9 and 3.8% with the spread of 0.25h and0.5h gains a very good result.Keywords: roving fibre concreteÂ Beton memiliki kelemahan pada kuat tarik dan sifat getasnya rendah (mudah putus)sehingga dalam perencanaan kapasitas tampang beton daerah tarik tidak diperhitungkan.Kelemahan beton dapat diperbaiki dengan menambah serat yang memiliki tujuan menulangi betondengan serat secara uniform. Serat yang dipakai adalah serat roving pada komposisi 1,9; 3,8; 5,7;dan 7,6% dari volume beton. Perubahan mekanis beton diperoleh dari uji silinder beton dan balokbeton berukuran 15 cm x 20 cm x 120 cm masing-masing 15 benda uji. Pengujian kapasitas lenturdiperoleh dari balok lentur murni. Hasil penelitian menunjukkan dengan penambahan seratmenyebabkan kapasitas tekan silinder beton secara signifikan turun, sedangkan kuat tarik betonnaik. Sifat daktilitas beton meningkat secara signifikan sedangkan modulus elastisitas beton secarasignifikan turun, kapasitas lentur balok pada komposisi serat 1.9 % dan 3.8 % dengan penyebaran0.25 h dan 0.5 h diperoleh hasil yang paling baik.Kata Kunci: beton serat roving

ANALISIS DAYA DUKUNG PONDASI TIANG-RAKIT PADA DAERAH RAWAN GEMPA MENGGUNAKAN METODE POULUS DAN PROGRAM NUMERIS PLAXIS Kusumawardani, Rini; Apriyatno, Henry; Rachmawati, Rizky Julia; Anggraini, Ririn
Jurnal Teknik Sipil dan Perencanaan Vol 18, No 2 (2016)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jtsp.v18i2.7835

Abstract: Yogyakarta are situated in the zone with high potential of seismicity. Based on Indonesia map seismicity area, it categorized in a seismic zone 4. The secondary effect of this earthquake phenomena is a soll settlement due to of decreasng of void volume of soil mass. Based on these issues, the foundation system of building is the primary factor which must be considered. This paper revealed the comparation of foundation behavior due to static by using Poulos Method and PLAXS 2D. Pile-raft designed by Poulos method was chosen as a subject of research. Analysis of liquefaction potential, soil settlement, carrying capacity, and the safety factor was analyzed by using CYCLIC 1D, 2D PLAXIS and Methods Poulus. For analysis by the Poulus method reached a soil settelement 4.3 cm and a safety factor 10.76. While by using PLAXIS 2D obtained 0.30 cm and 2,088 for soil settlement and safety factor respectively. Furthermore, a seismic motion of 9.2 scale of Richter mgnitude are injected into analysis resistance of foundation. Abstrak: Kota Yogyakarta merupakan wilayah yang memiliki potesi sesismik yang tinggi berdasarkan peta potensi gempa Indonesia. Dalam peta tersebut dikatakan bahawa Kota Yogyakarta terletak pada zona seismik 4. Bahaya sekunder yang terjadi akbat peristiwa gempa adalah adanya penurunan tanah. Berdasarkan permasalahan ini, pemilihansistem fondasi pada pada suatu bangunan adalah hal yang terpenting. Pada artikel ini dijelaskan mengenai perbandingan mengenai perilaku fondasi akibat beban statik meggunakan metode Poulos dan Plaxis 2D. Fondasi tiang rakit dianalisa dengan meggunakan metode Poulos dan Plaxis 2D. Analisis megenai potensi likuifaksi, penurunan tanah, daya dukung fondasi dan faktor kemanan struktur dianalisis menggunakan CYCLIC 1D, Plaxis 2D dan Metode Poulus. Untuk analisis menggunakan metode Poulos pada fondasi rakit-tiang diperoleh nilai penurunan 4,3 cm dan faktor keamanan 10,76. Untuk analisis menggunakan Plaxis 2D diperoleh penurunan sebesar 0,30 dan angka keamanan pondasi tiang-rakit sebesar 2,088. Selain itu juga dilakukan analisis mengenai ketahanan fondasi ketika menerima beban gempa dengan skala magnitude 9.2 Richter.

Experimental Study of Pull-Out Failure on Sanko Hammer Drive Anchor Using Cast in Place and Post-Installed Methods on Ready-mix Concrete with Quality of 25 Mpa Apriyatno, Henry; Supriyono, Supriyono; Taveriyanto, Arie
Jurnal Teknik Sipil dan Perencanaan Vol 23, No 1 (2021)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jtsp.v23i1.28027

Abstract: Anchor serves to connect steel and concrete construction that can transfer steel pull-out load to concrete. Sanko hammer drive anchor usually has been available in the model of expansion that can be installed into concrete with cast in place and post installed methods. The experiment was aimed at comparing pull out failures of Sanko hammer drive expansion anchor using cast in place and post installed installation methods based on pull-out failure behavior. Experimental data were obtained from the pull-out strength test of Sanko hammer drive expansion anchor, compressive strength test and ready-mix concrete split tensile test, adhesion strength test and group anchor pull-out test which consists of four units of anchor with diameter of 10 mm planted 90 mm depth on T concrete beams with dimension of 300 mm x 300 mm x 150 mm as many as three beams for each of them using cast in place and post installed installation methods. The results of the experiment showed that concrete compressive tension value (fâ€™c) is 25.69 MPa, anchor tension value (fu) is 383.25 MPa, anchor adhesion tension value (Î¼) with cast in place method is 2.25 MPa and post installed method is 1.56 MPa. Theoretically, the damage occurred in pull-out condition; while in the experiment, the test showed a difference in pull-out capacity using cast in place installation method of 38.38 kN with deformation of 13.81 mm, which is higher than theoretical value of 26,083 kN and using post installed method of 36.62 kN with deformation of 8.89 mm, which is higher than theoretical value of 18,084 kN and the experiment indicates that the anchor is perfectly pull-out.

Defleksi Lateral Tiang Tunggal Akibat Beban Lateral pada Tanah Lempung Berdasarkan Komparasi Tiga Metode Ahmad Jirjisul Ba'ist; Togani Cahyadi Upomo; Henry Apriyatno; Untoro Nugroho
Jurnal Teknik Sipil Vol. 15 No. 4 (2020)
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Atma Jaya Yogyakarta

The foundation has a function to hold the load in the form of axial load, lateral load and moment. The axial load on the pile foundation is supported by the pole end resistance and pile friction, while the lateral load on the pile foundation is supported by the relation of the blanket area along the pile with the ground in the lateral direction. Lateral load causes lateral deflection in which the magnitude of deflection must not exceed the permissible lateral deflection limit of 2.54 cm. The determining factors in lateral deflection are the type of pile foundation, soil type, and the magnitude of the force that occurs. The foundation of a single pile in which the number of one pile when embedded in clay soil needs to be investigated for the magnitude of lateral deflection that occurs, this is due to the changing nature of the clay when under the influence of high or low water content. The foundation of the pile uses a concrete head with the condition of a free end with a cylindrical shape with a diameter of 60 cm that is not solid with a wall thickness of 10 cm and a compressive strength of concrete of 60 MPa. Clay soil data uses soil drilling test data in Wirosari, Grobogan, Central Java. The planning method used is the finite element method (PLAXIS) and the finite difference method (p-y curve and the ALLPILE program) with lateral load variations of 10 kN, 15 kN and 20 kN given to the top end of the pole with the principle of giving trial and error loads. The results of the calculation of the lateral deflection of the pile on the p-y curve method with finite difference resolution, the ALLPILE program, and the PLAXIS program respectively with a lateral load of 10 kN are 0.0629 cm; 1.21 cm; 0.27 cm, lateral loads of 15 kN are 0.0943 cm; 2.13 cm; 0.4051 cm, and a lateral load of 20 kN is 0.1258 cm; 3.14 cm; 0.5402 cm. Thus the lateral deflection load limit is 15 kN, so as not to exceed the permissible lateral deflection limit of 2.54 cm. The recommended method used is the ALLPILE program to better get the level of security from the lateral deflection of the pole when applied in the field.

EKSPERIMEN KEGAGALAN BREAKOUT CHEMICAL ANCHOR STUD METODE CAST IN PLACE DAN POST INSTALLED DENGAN MODIFIKASI LUBANG DRILL BIT EXTRACTOR Novera Kresiariati; Henry Apriyatno
Citizen : Jurnal Ilmiah Multidisiplin Indonesia Vol. 2 No. 3 (2022): CITIZEN: Jurnal Ilmiah Multidisiplin Indonesia
Publisher : DAS Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53866/jimi.v2i3.104

Anchors are needed to transmit the load to the concrete in strengthening the structure of a building. The anchor is installed in two ways, namely the cast in place method and the post installed method. In the post installed method, given Sika anchorfix-2 adhesive. The study was conducted to determine the type of failure that occurred, the pullout capacity of the anchor implanted on the hef 90 mm, and the average value of the adhesive strength (μ) of the M12 x 160 mm stud anchor on the T beam specimen measuring 390 x 270 x 300 mm as many as three samples. Each method of cast in place, post installed plain holes, and post installed screw holes using 32.30 MPa fc' concrete with pullout test. The results of the study, the type of failure that occurs is a breakout failure. The pulling capacity value obtained in the cast in place method is 14415.78 N, the plain hole post installed method is 77603.29 N, and the screw hole post installed method is 87377.25 N. The anchoring strength capacity of the plain hole post installed method is higher. greater than the cast in place method with an increase of 6.82%, the adhesive strength of the post installed method with threaded holes is greater than the cast in place method with an increase of 8.14%, and the adhesive strength of the post installed method of threaded holes is greater than the post installed method of holes plain with an increase of 1.24%.

EXPERIMENT ON CHEMICAL ATTACHMENT OF ANCHOR DEFORM DEPTH 110 MM CAST-IN PLACE AND POST-INSTALLED DRILL BIT EXTRACTOR METHOD Bastian Dwi Ananta; Henry Apriyatno
Citizen : Jurnal Ilmiah Multidisiplin Indonesia Vol. 2 No. 3 (2022): CITIZEN: Jurnal Ilmiah Multidisiplin Indonesia
Publisher : DAS Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53866/jimi.v2i3.107

The anchor is one of the steel elements that can withstand the adhesive force against the concrete. The study aims to determine the adhesive strength between the anchor and the concrete through two anchor installation methods: the cast-in-place method with three test objects and post-installed chemical epoxy in two plain hole models with three test objects. And threaded three test specimens using a drill bit extractor Sika Anchorfix-2 chemical epoxy adhesive. Anchor deform model D13 is used with a depth of planting (hef) of 110 mm, which is planted on nine cylinders of 300 x 150 mm with a quality of fc 32.26 MPa. This study aims to determine the pulling capacity, adhesive strength, and damage patterns in the cast-in-place and post-installed methods. The results of the pull-in strength test using the cast-in-place method are 34323.28 N, the post-installed method is plain hole 37919.05 N, and the drill hole is 38572.82 N. The adhesive strength (µ) post-installed drill hole is 9.27 MPa > adhesive strength (µ) cast in place 7.64 MPa with an increase (phi) of 1.21 times, adhesive strength (µ) post installed plain hole 7.84 MPa > adhesive strength (µ) cast in place 7.64 MPa with an increase (phi) of 1 .03 times, adhesive strength (µ) post installed drill hole 9.27 MPa > adhesive strength (µ) post installed plain hole 7.84 MPa with an increase (phi) of 1.18 times. With a pullout failure pattern on all cylindrical test specimens.

Perilaku Kegagalan Breakout terhadap Gaya Geser pada Baut Angkur terhadap Perbandingan Kekuatan Metode Pemasangan Cast in Place dan Post Installed Indryawan, Helmy Khrisna; Apriyatno, Henry
Prosiding Seminar Nasional Teknik Sipil UMS 2020: Prosiding Seminar Nasional Teknik Sipil UMS
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1878.446 KB)

Penelitian dilakukan dengan menggunakan dua metode pemasangan yang berbeda yaitu cor ditempat (Cast-in Place) dan pasca pasang (Post Installed) dengan meninjau kegagalan kuat jebol (Breakout) beton terhadap gaya geser. Kuat jebol (Breakout) beton terhadap gaya geser dipengaruhi oleh jarak dari pusat baut ke tepi beton. Penelitian dilakukan meliputi pengujian tekan beton, pengujian tarik belah beton menggunakan 6 unit spesimen beton berbentuk silinder 150 mm x 300 mm, dan pengujian Breakout geser angkur menggunakan media beton yang ditinjau berdimensi 300 mm x 300 mm x 150 mm sebanyak 6 unit. Angkur yang digunakan adalah angkur pukul sanko berdiameter 12 mm sebanyak 4 unit untuk 1 spesimen beton. Hasil pengujian kuat tarik angkur didapatkan hasil tegangan leleh sebesar 338 MPa dan tegangan ultimate sebesar 383 MPa, sedangkan hasil pengujian kuat tekan beton didapatkan hasil sebesar 25,2 MPa. Kuat jebol (Breakout) beton dari hasil hitungan toritis didapatkan hasil sebesar 47406,61 N. Dari pengujian penulis mendapatkan hasil kuat breakout untuk metode pemasangan Cast-in Place sebesar 48150.75 N dan untuk metode pemasangan Post Installed sebesar 47742.00 N. Beban maksimum yang diperoleh dari hasil pada kedua metode pengujian nilainya mendekati pada perhitungan teoritis. Nilai pengujian Breakout terhadap geser dengan pemasangan angkur metode Cast-in Place lebih besar dibandingkan dengan nilai pengujian dengan menggunakan metode Post Installed.

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