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Studi Alternatif Loss of Prestress PC I Girder Akibat Metode Single Stressing dan Double Stressing Pada Section Overpass STA 52+174 Proyek Jalan Tol Balikpapan-Samarinda Sujiati Jepriani; Willy Susanto; Joko Suryono
Jurnal Teknik Sipil Vol 29 No 2 (2022): Jurnal Teknik Sipil
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2022.29.2.4

Abstract

Abstrak Salah satu pekerjaan penting yang dilakukan pada beton prategang yaitu proses pemberian tegangan (stressing). Pemberian tegangan pada beton prategang mengakibatkan kehilangan gaya prategang yang harus dipertimbangkan pada perencanaan. Metode stressing pada beton pascatarik dapat dilakukan dengan metode satu arah (single stressing) dan metode dua arah (double stressing). Tujuan penelitian ini adalah untuk mengetahui nilai kehilangan gaya prategang pada girder jembatan akibat stressing dengan metode satu arah dan metode dua arah serta mengetahui pengaruh panjang bentang girder terhadap kehilangan gaya prategang. Analisis yang dilakukan meliputi menghitung pembebanan dan gaya prategang, menghitung kehilangan prategang akibat metode stressing satu arah dan dua arah, serta kontrol tegangan dan lendutan pada girder. Jenis girder yang digunakan pada penelitian ini adalah PC I girder dengan bentang 25,80 m dan 16,80 m. Dari hasil analisis diperoleh bahwa metode penarikan satu arah menghasilkan kehilangan gaya prategang lebih besar dibandingkan dengan metode penarikan dua arah. Kehilangan gaya prategang akibat penarikan satu arah pada PC I girder bentang 25,80 m adalah sebesar 25,03 % dan sebesar 27,18% pada PC I girder bentang 16,80 m. Kehilangan gaya prategang akibat penarikan dua arah pada PC I girder bentang 25,80 m adalah sebesar 17,22 % dan sebesar 24,12% pada PC I girder bentang 16,80 m. Kehilangan gaya prategang pada PC I girder bentang 25,80 m nilainya lebih kecil dibandingkan kehilangan gaya prategang pada PC I girder bentang 16,80 m. Kata-kata Kunci: Beton prategang, kehilangan gaya prategang, metode stressing, penarikan dua arah, penarikan satu arah. Abstract One of the important work carried out on prestressed concrete is the stressing process. The application of stress to prestressed concrete results in a loss of prestressing force which must be considered in the design. Theoretically, the stressing method of post-tensioned concrete can be carried out using a single stressing method and a double stressing method. The purpose of this study was to determine the value of the loss of prestressing force on the bridge girder due to stressing with the one-way method and the two-way method and to determine the effect of the length of the girder span on the loss of the prestressing force. The analysis carried out includes calculating the load and prestressing force, calculating the prestress loss due to one-way and two-way stressing methods, and controlling stress and deflection on the girder. The type of girder used in this study is a PC I girder with a span of 25,80 m and 16,80 m. From the results of the analysis, it was found that the one-way pulling method resulted in a greater loss of prestressing force than the two-way pulling method. Loss of prestressing force due to one-way tension on a PC I girder span of 25,80 m is 25,03% and 27,18% in a PC I girder span of 16,80 m. Loss of prestressing force due to two-way tension on a PC I girder span of 25,80 m is 17,22% and 24,12% at a PC I girder span of 16,80 m. The loss of prestressing force on the PC I girder span of 25,80 m is smaller than the loss of prestressing force on the PC I girder span of 16,80 m. Keywords: Bouble stressing, loss of prestressing force, prestressed concrete, single stressing, stressing method
Evaluasi Gedung Workshop Teknik Konstruksi dan Perumahan di SMKN 2 Samarinda Yudi Pranoto; Sujiati Jepriani
Jurnal Pengabdian Pada Masyarakat Vol 8 No 3 (2023): Jurnal Pengabdian Pada Masyarakat
Publisher : Universitas Mathla'ul Anwar Banten

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30653/jppm.v8i3.389

Abstract

Bangunan Gedung/Bengkel Teknik Konstruksi dan Perumahan (TKP/BKP) di SMKN 2 Samarinda merupakan salah satu bangunan sekolah yang cukup tua, yaitu usia ± 38 tahun. Gedung workshop ini digunakan sebagai ruang kelas, ruang praktek dan ruang administrasi, dengan ± 75 orang melakukan kegiatan setiap harinya. Di dalam gedung bengkel terdapat beberapa mesin mekanik praktis, yaitu bar bander dan jeruji pemotong besi-beton, serta tempat menyimpan beton dan bahan-bahan praktis lainnya. Pada waktu-waktu tertentu bengkel juga digunakan sebagai tempat kegiatan yang cukup besar, seperti pertemuan orang tua dan komite sekolah yang melibatkan lebih dari 200 orang. Hal ini menimbulkan kekhawatiran bagi Kepala Sekolah dan Instruktur tentang keselamatan pengguna bangunan karena kondisi bangunan sudah banyak mengalami kerusakan pada elemen strukturnya.Dengan latar belakang tersebut, kami ingin membantu mengatasi permasalahan yang dihadapi mitra dengan melakukan evaluasi terhadap TKP/ gedung bengkel BKP. Dengan tim yang memiliki keahlian struktur dan manajemen akan berusaha memberikan rekomendasi dan solusi penguatan struktur yang dapat menjadi acuan bagi pemangku kepentingan dalam pengambilan kebijakan penanganan permasalahan di gedung bengkel TKP/BKP. Dari hasil kajian diketahui bahwa gedung bengkel TKP SMK 2 Samarinda dikategorikan rusak berat. Untuk mencegah jatuhnya korban jiwa, perlu dilakukan perkuatan bangunan baik pada kolom, balok maupun dindingnya. The construction and housing engineering workshop building/construction and housing business (TKP/BKP) at SMKN 2 Samarinda is one of the school buildings that is quite old, aged ± 38 years. This workshop building is used as a classroom, practice room and administration room, with ± 75 people doing activities every day. Inside the workshop building, there are several practical mechanical machines, namely bar banders and iron-concrete cutter bars, as well as a place to store concrete and other practical materials. At certain times the workshop is also used as a place for quite large activities, such as a meeting of parents and school committees involving more than 200 people. This raises concerns for the Principal and Instructors about the safety of building users because the condition of the building has suffered a lot of damage to its structural elements.With this background, we want to help solve the problems faced by partners by evaluating the TKP / BKP workshop buildings. With a team that has structural and management expertise, they will try to provide recommendations and solutions for strengthening structures that can be a reference for stakeholders in making policies on handling problems in the TKP/BKP workshop building. From the results of the study, it was found that the TKP SMK 2 Samarinda workshop building was categorized as heavily damaged. To prevent casualties, it is necessary to strengthen the building both on the columns, beams and walls.
Pemanfaatan Pencahayaan Alami Pada Renovasi Rumah Tinggal Menghadap Arah Barat Ibayasid Ibayasid; Sujiati Jepriani; Hatta Musthafa A.P; Bhanu Rizfa Hakim
Jurnal Poli-Teknologi Vol. 19 No. 1 (2020)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v19i1.2733

Abstract

The need for housing is very rapid, especially the type of house growing with several choices of area, namely types 21, 27, 36, 45 to 120m2. In the growing house will be provided land for homeowners to develop the house so it is more feasible. The concept of housing provided by the developer is sometimes incompatible with the concept of utilizing natural lighting because it only emphasizes attractive design and number of units. For this reason, it is necessary to provide a reference for homeowners as a strategy to renovate buildings facing the west so that the utilization of natural lighting remains optimal and meets the measurement of comfort visually. The study will analyze the average lux value or Daylight Levels avarage of natural lighting resulting from the amount of light openings. The analysis will be done is the average value of natural lighting from the location strategy and the amount of light aperture in producing quality lighting in space. The kitchen room and family room are spaces with a high level of activity that require optimal lighting. The most optimal lighting level is the opening type of model 1 with 10% opening in the west, 10% opening in the roof, and 50% in the east. The resulting lighting level is 998.58 lux in clear sky conditions and 849 lux overcast conditions.