Agustin, Winda (2024) Studi Eksperimental Elemen Link Slab Pracetak Pada Struktur Jointless Bridge Deck Menggunakan Engineered Cementitious Composite. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Expansion joint yang biasa digunakan untuk menghubungkan antar dek jembatan pada struktur jembatan bentang sederhana sering mengalami kerusakan dan kebocoran yang dapat menyebabkan kerusakan lebih lanjut pada struktur jembatan. Untuk mengatasi permasalahan ini, penelitian ini menyajikan link slab menggunakan engineered cementitious composite (ECC) yang dibuat dengan sistem pracetak sebagai alternatif pengganti expansion joint. Kinerja link slab ECC pracetak dievaluasi terhadap beban lentur monotonik berulang (loading-unloading). Kemudian hasil uji dibandingkan dengan link slab konvensional beton bertulang dan link slab hybrid kombinasi ECC dan beton normal. Ketiga benda uji tersebut diperkuat dengan baja tulangan rasio 1.17%. Link slab ECC pracetak juga dibuat dengan rasio tulangan 0.5% untuk mengetahui pengaruh rasio tulangan terhadap kinerjanya. Hasil uji lentur monotonik menunjukan, link slab ECC pracetak rasio tulangan 1.17% memiliki kapasitas lentur yang lebih besar serta mampu mengendalikan lebar retak yang signifikan dibandingkan link slab konvensional dan link slab hybrid yaitu lebih besar 13% dengan P_max=178.91 kN dibandingkan link slab konvensional (P_max= 158.71 kN). Dan lebih besar 11% dibandingkan link slab hybrid setelah dilakukan normalisasi momen penampang. Link slab ECC pracetak rasio tulangan 0.5% mengalami penurunan kapasitas lentur sebesar 29% dengan P_max= 109.28 kN dibandingkan link slab konvensional. Hal ini terjadi karena rasio tulangan yang digunakan lebih rendah sehingga momen kapasitas yang dihasilkan juga rendah. Walaupun demikian, benda uji ini masih mampu menahan momen lentur akibat sudut rotasi ujung maksimum balok jembatan. Dikarenakan modulus elastisitas ECC (E_ECC = 18479 MPa) lebih rendah dari pada beton normal (E_NC = 26172 MPa) , penggunaan ECC memberikan efek positif pada link slab yaitu memperkecil momen akibat rotasi balok jembatan. Momen pada link slab ECC pracetak dan link slab hybrid akibat sudut rotasi ujung balok jembatan lebih rendah masing-masing 29% dan 15% dibandingkan link slab konvensional. Selain itu, kinerja pertemuan antara link slab ECC pracetak dan dek jembatan juga menunjukkan kontinuitas yang baik. Tidak ditemukannya retak pada bagian ini akibat pembebanan monotonik. Berdasarkan hasil yang disajikan menunjukkan bahwa respon link slab ECC pracetak lebih baik dibandingkan link slab konvensional dan link slab hybrid ditinjau dari momen yang terjadi akibat rotasi ujung balok jembatan, kapasitas momen, dan pengendalian lebar retak.
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Expansion joints, which are usually used to connect bridge decks on simple span bridge structures, often experience damage and leaks, which can cause further damage to the bridge structure. To tackle this problem, this research presents a link slab using engineered cementitious composite (ECC) made using a precast system as an alternative replacement for expansion joints. The performance of the precast ECC link slab was evaluated against repeated monotonic bending loads (loading-unloading). Then the test results were compared with conventional reinforced concrete link slab and hybrid link slab combined with ECC and normal concrete. The three specimens were reinforced with reinforcing steel with a ratio of 1.17%. Precast ECC link slab were also made with a reinforcement ratio of 0.5% to determine the effect of the reinforcement ratio on its performance. The results of the monotonic bending test show that precast ECC link slab with a reinforcement ratio of 1.17% have a greater flexural capacity and are able to control significant crack widths compared to conventional link slab and hybrid link slab, which are 13% greater with P_(max )=178.91 kN compared to conventional link slab (P_(max )= 158.71 kN). And 11% greater than the hybrid link slab after the normalized sectional moment. The precast ECC link slab with a reinforcement ratio of 0.5% experienced a reduction in the flexural capacity of 29% with P_(max )= 109.28 kN compared to the conventional link slab. This happens because the reinforcement ratio used is lower, so the resulting capacity moment is also low. However, this test specimen was still able to withstand the bending moment due to the maximum end rotation angle of the bridge beam. Because the modulus of elasticity of ECC (E_ECC = 18479 MPa) is lower than normal concrete (E_NC = 26172 MPa), the use of ECC has a positive effect on the link slab, namely reducing the moment due to the end rotation angle of the bridge beam. The moments in the precast ECC link slab and hybrid link slab due to the end rotation angle of the bridge beam are 29% and 15% lower, respectively, compared to the conventional link slab. In addition, the interface performance between the precast ECC link slab and the bridge deck also shows good continuity. No cracks were found in this section due to monotonic loading. Based on the results presented show that the response of the precast ECC link slab is better than that of the conventional link slab and hybrid link slab in terms of moments that occur due to the end rotation angle of the bridge beams, moment capacity, and crack width control.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | expansion joint, link slab, ECC, beton normal, pracetak, retak, normal concrete, precast, crack |
| 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: | Winda Agustin |
| Date Deposited: | 02 Feb 2024 02:34 |
| Last Modified: | 02 Feb 2024 02:34 |
| URI: | http://repository.its.ac.id/id/eprint/105904 |
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