Studi Batas Kemampuan Layan Balok Beton dengan Tulangan Glass Fiber Reinforced Polymer (GFRP) menggunakan Simulasi Numerik 3DNLFEA

Ramadhani, Erlyana Saputri (2024) Studi Batas Kemampuan Layan Balok Beton dengan Tulangan Glass Fiber Reinforced Polymer (GFRP) menggunakan Simulasi Numerik 3DNLFEA. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Tulangan GFRP dipilih sebagai alternatif pengganti tulangan baja konvensional karena sifatnya yang tidak korosif. Hasil penelitian menunjukkan pemanfaatan tulangan GFRP untuk tulangan longitudinal dan transversal aman untuk diterapkan. Berdasarkan sifat mekanikal material GFRP, desain struktur beton bertulang GFRP diharapkan mengikuti ketentuan yang diatur oleh persyaratan kemampuan layan (serviceability), tidak dengan kapasitas ultimit (Ultimate capacity). Hal tersebut dikarenakan elastisitas tulangan GFRP yang rendah, sehingga tingkat pembebanan eksternal yang rendah dapat mengakibatkan regangan besar yang mana dapat menyebabkan lebar retak dan defleksi yang signifikan. Studi Numerik ini menyajikan prediksi batas kemampuan layan (serviceability limit states) balok bertulang GFRP dalam bentuk hasil analisa kapasitas tegangan lentur, defleksi dan lebar retak dengan metode analisa elemen hingga menggunakan program 3DNLFEA. Simulasi numerik menggunakan model benda uji balok 300 x 400 mm, panjang bentang 2100 mm dan 3300 mm. Variasi parameter sebagai variabel pembanding adalah mutu beton (〖f'〗_c), rasio tulangan 〖(ρ〗_f/ρ_b) dan rasio bentang geser terhadap tinggi efektif balok (a/d). Hasil studi numerik diperoleh defleksi dan lebar retak balok bertulang GFRP diketika dibebani dengan beban layan memenuhi kriteria batas layan, sedangkan ketika dibebani dengan beban ultimit melebihi kriteria batas layan dan balok telah runtuh. Dengan demikian, diharapkan desain struktur beton bertulang GFRP mengikuti persyaratan kemampuan layan tidak dengan kapasitas ultimit, dengan memperhatikan untuk memperoleh hasil yang optimum dianjurkan desain harus memenuhi kedua kriteria batas layan, yaitu batas defleksi dan lebar retak maksimum. Membandingkan dengan kemampuan layan tulangan baja, balok beton bertulang baja memiliki kapasitas yang lebih tinggi dan dapat menahan deformasi lebih besar dibandingkan balok beton bertulang GFRP. Berdasarkan kapasitas beban layan balok bertulang baja, diperlukan kebutuhan luas tulangan GFRP sebesar 2,75 kali luas tulangan baja. Berdasarkan kapasitas layan balok bertulang GFRP sama dengan baja, diperoleh defleksi tengah bentang balok bertulang GFRP 1,3 kali lebih besar dari balok bertulang baja.
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GFRP reinforcement was chosen as an alternative to conventional steel reinforcement because of its non-corrosive nature. The results showed that the use of GFRP reinforcement for longitudinal and transverse reinforcement is safe to apply. Based on the mechanical properties of GFRP materials, the design of GFRP reinforced concrete structures is expected to follow the provisions regulated by serviceability requirements, not by Ultimate capacity. This is due to the low elasticity of GFRP reinforcement, so a low external loading rate can result in large strains which can cause significant crack width and deflection. This numerical study presents predictions of serviceability limit states of GFRP reinforced beams in the form of analysis results of bending stress capacity, deflection and crack width using the finite element analysis method using the 3DNLFEA program. Numerical simulation use a 300 x 400 mm beam specimen model, span lengths 2100 mm and 3300 mm. Parameter variations as comparative variables are concrete quality (fc) reinforcement ratio (pf/pb) and the ratio of shear span to effective beam height (a/d). The results of the numerical study obtained the deflection and crack width of the GFRP reinforced beam when loaded with service load meets the service limit criteria, while when loaded with the ultimate load exceeds the service limit criteria and the beam has collapsed. Thus, it is expected that the design of GFRP reinforced concrete structures follows the service ability requirements not with the ultimate capacity, by paying attention to obtaining optimum results, it is recommended that the design must meet both serviceability criteria, namely the deflection limit and maximum crack width. Compared with the serviceability of steel reinforcement, steel reinforced concrete beams have a higher capacity and can withstand greater deformation than GFRP reinforced concrete beams. Based on the service load capacity of steel reinforced beams, the GFRP reinforcement area is required to be 2.75 times the steel reinforcement area. Based on the service capacity of GFRP reinforced beams being the same as steel, the mid-span deflection of GFRP reinforced beams is 1.3 times greater than that of steel reinforced beams.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Balok Beton Bertulang, Serviceability Limit States, Tulangan Lentur GFRP, Metode Elemen Hingga, 3DNLFEA reinforced concrete beam, serviceability limit states, GFRP bending reinforcement, finite element method, 3DNLFEA
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA440 Concrete--Cracking.
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis
Depositing User:	ERLYANA SAPUTRI RAMADHANI
Date Deposited:	08 Aug 2024 08:09
Last Modified:	29 Aug 2024 05:29
URI:	http://repository.its.ac.id/id/eprint/115118

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