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TINJAUAN FATIK ELEMEN STRUKTUR ATAS JEMBATAN TERHADAP LHR DAN USIA RENCANA SESUAI AASHTO 2012 Fahimuddin, Fauzri; Hakim, Dio Akbar; Indiandto, Andi
Construction and Material Journal Vol 1, No 3 (2019): CONSTRUCTION AND MATERIAL JOURNAL VOL. 1 NO. 3 NOVEMBER 2019
Publisher : Politeknik Negeri Jakarta

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Abstract

AbstractA lot of structures failure on the bridge, causes a collapsed to the bridges. The reason of the collapsed was dynamic loads that happen on the bridge. Dynamic loads make stress and relax happen at the same time. Fatigue analysis is an analysis that calculate the dynamic load that happen on the bridge, with counting the big vehicle or truck. Fatigue analysis can’t analyze all the element with one step. In this research the bridge was a truss bridge with span 70 m as the main structure. In fatigue analysis, stress that used was stress that caused by dead load and stress that caused by the big vehicle or truck passing through. The value between that stresses used to call stress range. In AASHTO the value of truck that passing truck in a traffic called Average Daily Truck Traffic (ADTT). Stringer, cross beam, and main truss was the element that will be analyzed. In this structure we use category B, where ADTT is 860, Threshold is 110 MPa, A is 39,3 x 1011, and the n is 1. From stress range that happen in the structure, we can find the age and ADTT until the bridge collapse because fatigue. In the end the elements that had the lowest age and the lowest ADTT was the main truss, where it just has 27 years old left and can only take 299 truck/day. Then the bridge has to get a maintenance and repair before it gets 27 years old.Keywords : Fatigue, age, ADTT, stress rangeAbstrakBanyak terjadinya kegagalan struktur pada jembatan, yang menyebabkan keruntuhan pada jembatan. Hal itu disebabkan oleh beban dinamis yang terjadi pada jembatan. Beban dinamis membuat terjadinya tegangan dan relaksasi dalam waktu bersamaan. Analisa fatik merupakan perhitungan dengan memperhitungkan beban dinamis yang terjadi pada jembatan, dengan beban dianggap sebagai kendaraan besar atau truk. Memperhitungkan kondisi fatik tidak dapat dihitung langsung untuk satu jembatan. Dalam analisa ini menggunakan jembatan dengan bentang 70 m sebagai struktur rangka atasnya. Pada Analisa fatik tegangan yang dihitung berupa tegangan akibat beban sendiri pada jembatan dan tegangan ketika dilalui oleh kendaraan besar atau truk. Perbedaan tegangan tersebut biasa disebut dengan stress range. Pada AASHTO, lalu lintas harian rata-rata (LHR) biasa disebut Average daily truck traffic (ADTT). Elemen yang dihitung berupa stringer, cross beam, dan batang rangka utama. Pada struktur ini kategori yang digunakan adalah kategori B dengan ADTT sebesar 860, threshold sebesar 110 MPa, A sebesar 39,3 x 1011 MPa3 dan n sebesar 1. Dari stress range yang didapat, maka dapat dicari umur jembatan serta ADTT hingga jembatan pada kondisi fatik. Dapat disimpulkan bahwa elemen yang mempunyai umur dan ADTT terendah adalah batang rangka utama, dengan nilai umur rencana 27 tahun dan ADTT 299 truk/hari. Dengan demikian dapat dinyatakan bahwa jembatan harus diberi perkuatan saat umur mendekati 27 tahun.Kata kunci : Fatik, umur rencana, ADTT, stress range.
Pembangunan Jembatan Penyeberangan Orang RT 03/ RW 04 Kampung Pondok Manggis, Kelurahan Bojong Baru, Kecamatan Bojonggede Kabupaten Bogor Fahimuddin, Fauzri; Yelvi, Yelvi; Sudardja, Handi
Mitra Akademia: Jurnal Pengabdian Masyarakat Vol 1, No 2 (2018): Mitra Akademia
Publisher : Unit Penelitian dan Pengabdian kepada Masyarakat (UP2M) Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/mapnj.v1i2.1351

Abstract

Kegiatan pengabdian masyarakat berbasis program studi ini dilaksanakan dengan melakukan pekerjaan pembangunan Jembatan Penyeberangan Orang (JPO) sepanjang 6 meter khususnya bagi masyarakat Kampung Pondok Manggis, Desa Bojong Baru RT. 03, RW 04, Kecamatan Bojong Gede, Kabupaten Bogor. Jembatan Penyeberangan Orang ini dilbangun untuk menghubungi jalan yang dipisahkan oleh sungai kecil yang mempunyai lebar sekitar 2 m. Sebelumnya jalan ini dihubungkan oleh jembatan dari beton yang ketinggiannya hanya 10 - 20 cm dari permukaan air sungai, sehingga kalau pada musim hujan jalan tersebut berada di bawah permukaaan air dan tidak bisa dilalui. Kegiatan ini dimulai dari persiapan, survey lokasi awal, dan pengajuan proposal bulan April 2018. Selanjutnya dilakukan tahap pelaksanaan peninjauan lapangan untuk menentukan teknis pelaksanaan yang sudah terlaksana pada tanggal 06-13 Oktober 2018. Dengan selesainya pekerjaan pembangunan jembatan penyeberangan orang tersebut maka akan tersedia prasarana jalan warga yang layak dan memperlancar kegiatan khususnya transportasi masyarakat desa terutama pada musim hujan. Metode yang digunakan untuk mencapai tujuan di atas adalah Kerjasama antara Tim pengabdian masyarakat Program Studi Perancangan Jalan dan Jembatan, Jurusan Teknik Sipil, Politeknik Negeri Jakarta dengan warga secara bergotong royong melakukan pembangunan jembatan tersebut.
PENGARUH KARAT TERHADAP KETANGGUHAN MARETIAL BAJA UNTUK JEMBATAN Fauzri Fahimuddin
Jurnal Ilmiah Poli Rekayasa Vol 17, No 2 (2022): April 2022
Publisher : Pusat Penelitian dan pengabdian kepada Masyarakat (P3M) Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (261.29 KB) | DOI: 10.30630/jipr.17.2.239

Abstract

Rust is a major problem in steel bridge construction because it has the potential to affect the integrity of the structure and is also an important consideration for inspection and maintenance programs. This study shows the results of laboratory tests on the effect of rust within 1 to 9 weeks on fracture toughness as one of the important mechanical properties of steel bridge elements. The specimens in this study were made of SM 490 type, steel commonly used for bridge construction. Rustless and rusted specimens were used with varying degrees of exposure after immersion in acid solution to simulate the rate of rust. The effect of rust rate on fracture toughness due to mass loss was studied. The fracture toughness of each specimen was monitored for those specimens with exposure periods of 1 week, 2 weeks, 3 weeks, 4 weeks, and 9 weeks to test their effect on toughness. The results of this study showed that there was no significant reduction in the rusting duration of 1 week, 2 weeks, 3 weeks, 4 weeks, and 9 weeks of fracture toughness. Rusting and testing activity for the long term is still ongoing and will be continued, as the results of this study greatly help bridge designers and asset managers to better model rust inspection and maintenance plans and assess the structural integrity of steel bridges affected by rust more accurately.
Effect of one-year corrosion on steel bridge materials in the maintenance stage with the Charpy impact test method Fauzri Fahimuddin; Mudiono Kasmuri; Rikki Sofyan; Syarif Junaidi; Latha MS
SINERGI Vol 27, No 2 (2023)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2023.2.002

Abstract

Corrosion of steel bridges is a major problem because it has the potential to reduce the performance of the structure over its lifetime. One factor that should not be reduced is fracture toughness, so this should be a very important concern in the maintenance program. Existing guidelines do not specify when corrosion conditions are hazardous and when corrosion conditions are not hazardous to structural performance. This study aims to explain how long corrosion does not cause danger, and when corrosion becomes dangerous. The Charpy Impact Test was used in this study to examine the effect of corrosion with a corrosion duration of weekly up to one year on fracture toughness. The series of tests in this research program used SM-490-type specimens which are steel plates commonly used for bridge structures. Specimens with variations in corrosion duration which were the result of immersion in sulfuric acid solution to simulate corrosion growth were then subjected to crack toughness testing. The toughness of each specimen was tested with a corrosion period starting from 1 week and so on up to 1 year to determine the level of fracture toughness. The results obtained from all tests showed that there was no decrease in the toughness of the corroded specimens for up to 1 year. The data presented in this study is very helpful for the designers and maintainers to plan corrosion treatment programs with clearer and more accurate considerations in assessing the structural integrity of steel bridges affected by corrosion.