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All Journal Jurnal Rekayasa Sipil dan Desain Jurnal Aplikasi Teknik Sipil
Masdar Helmi
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Civil Engineering, Building, Construction & Architecture

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Kajian Permasalahan Getaran pada Pelat dan Balok Beton Bertulang di Gedung E Fakultas Teknik Universitas Lampung Silsila Jana Firdasa; Fikri Alami; Masdar Helmi
Jurnal Rekayasa Sipil dan Desain Vol 8, No 2 (2020): Edisi Juni 2020
Publisher : Jurnal Rekayasa Sipil dan Desain

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Abstract

The planning of a building has some criterias that need detailed attention which are the stiffness, strength, stability, flexibility and economical aspect. This result focus for building planner which is need the experimental method that use tools such as hammer test, Ultrasonic Pulse Velocity (UPV) and accelerator. Hence, the numerical method used SAP 2000 v.14.14.0.0. This result the frequency of the building was 1,953 Hz and the acceleration was 0,263 m/s2. Based on the SAP 2000 v.14.14.0.0 calculation, the building frequency was 7,078142 Hz and the acceleration was 0,001005 m/s2. The different results between those two methods were caused by unsatisfying building quality that caused the difference of result between those two methods. The building frequency fitted the specification attached on ISO 2631-2: 2003 but the acceleration was bigger 0,5% than the gravitation. The adding of BJ 37 IWF 350 mm x 175 mm could enhance the vibration frequency from 7,078142-7,3351 Hz as many as 3,630% and the acceleration from 0,001005-0,0009177 m/s2 as many as 8,6865%.Key words: Beam, Plate, Vibration, Frequency, Acceleration.
Pengaruh Abu Sekam Padi Sebagai Bahan Pengganti Sejumlah Semen Terhadap Kuat Tekan dan Kuat Lentur pada Beton Reaktif (Reactive Powder Concrete) Mufidah Aulia Annisa; Masdar Helmi; Laskmi Irianti
Jurnal Rekayasa Sipil dan Desain Vol 7, No 2 (2019): Edisi Juni 2019
Publisher : Jurnal Rekayasa Sipil dan Desain

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Abstract

Kualitas beton dapat ditentukan dari komposisi adukan, jenis bahan, dan cara perawatan. Betonreaktif adalah salah satu jenis beton mutu tinggi yang komposisinya mengandung banyak semendan bahan sangat halus lainnya serta di rawat dengan cara pemanasan. Abu sekam padi yangmengandung senyawa silika juga berpotensi untuk bahan adukan beton reakif.Penelitian ini dilakukan pada variasi presentase abu sekam sebagai pengganti sejumlah semen(0%, 10%, 20%, 30%, dan 40%) dan cara perawatan benda uji prisma 40 x 40 x 160 mm(pemanasan suhu pada 180º, perawatan uap air panas pada 90 º, dan perendaman dalam air).Pengujian kuat lentur pada umur 7 hari dan kuat tekan pada umur 7 hari dan 28 hari. Hasil pengujian menunjukan bahwa kuat lentur optimum 16, 48 MPa diperoleh dari komposisi 10% abusekam dan perawatan uap air panas. Kuat tekan optimum juga diperoleh dari perawatan uap airpanas, namun pada komposisi 30% abu sekam, yaitu 37,54 MPa umur 7 hari dan 54,44 MPa umur28 hari. Dengan demikian abu sekam dapat digunakan untuk bahan pengganti sebagian semendalam komposisi beton reaktif dengan perawatan uap air panas.Kata kunci : beton mutu tinggi, beton reaktif , reactive powder concrete, abu sekam, kuat tekan, kuat lentur.
Efisiensi Pemilihan Jenis Retrofiting dan Perkuatan Struktur (Strengthening) antara Sistem Portal dengan Sistem Prategang Eksternal pada Jembatan Pelat Berongga (Voided Slab) (Studi Kasus Jembatan Way Bako I) Aditia Reshi Dista; Mohd. Isneini; Masdar Helmi; Todo Herdyson Sitohang; Yoga Marta Agustiawan
Jurnal Aplikasi Teknik Sipil Vol 18, No 2 (2020)
Publisher : Departemen Teknik Infrastruktur Sipil Institut Teknologi Sepuluh Nopember Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (300.677 KB) | DOI: 10.12962/j2579-891X.v18i2.5412

Abstract

Sebuah jembatan dapat mengalami penurunan kekuatan akibat kerusakan struktur atau peningkatan beban sehingga tidak bisa berfungsi sebagaimana mestinya. Retrofiting dan strengthening merupakan alternatif solusi agar jembatan mampu melayani beban yang melintas sampai umur rencana. Penelitian ini bertujuan untuk mengevaluasi kondisi eksisting jembatan dan menganalisis metode retrofiting dan strengthening yang efisien dari segi kekuatan struktur dan biaya konstruksi. Analisis struktur prategang eksternal berdasarkan Pd-T-02-2004-B sedangkan sistem portal sesuai SNI-1729-2015. Hasil pengamatan kondisi jembatan menunjukkan bahwa Jembatan Way Bako I telah mengalami kerusakan struktur maupun non struktur. Nilai momen nominal dan lendutan sebelum perkuatan adalah 5569,57 kN.m dan 18 mm, setelah diperkuat dengan sistem prategang eksternal menjadi 7097,88 kN.m (Mu/Mn = 0,8191) dan 17 mm sedangkan sistem portal 13764,62 kN.m (Mu/Mn = 0,4131) dan 18 mm. Biaya sistem prategang eksternal Rp 1.170.790.000,- sedangkan sistem portal Rp 1.658.740.000,-. Dengan demikian metode prategang eksternal lebih tepat diterapkan pada Jembatan ini.
Pengaruh Serat Baja Terhadap Kuat Tarik Lentur Balok Beton yang Disambung Tri Ratna Utami; Vera Agustriana Noorhidana; Surya Sebayang; Masdar Helmi
Jurnal Rekayasa Sipil dan Desain Vol 10, No 2 (2022): Edisi Juni 2022
Publisher : Jurnal Rekayasa Sipil dan Desain

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Abstract

The casting of concrete at different times often occurs, this is due to insufficient casting time, expansion or connection of structural components, strengthening of structures with additional dimensions, and so on. Thus there will be the addition of a new layer of concrete (overlay). This study is to determine the flexural tensile strength of concrete beams for joining old concrete and new concrete with the addition of steel fiber volume fractions of 0%, 1%, 1.5%, and 2% in the substrate layers overlay and also the compressive strength of the concrete in each layer. The samples in this study were beams (15 x 15 x 60 cm) with a thickness of 7.5 cm for substrate and overlay for flexural tensile strength testing and cylinders (15 cm in diameter and 30 cm in height) for compressive strength testing. From the results of the study, it was found that the flexural tensile strength of the beam with the addition of steel fibers in the substrate layer was higher than the addition of steel fibers in the overlay layer. The addition of steel fibers in the substrate and overlay layers makes the beam more ductile. The maximum flexural tensile strength of the beam with the addition of steel fibers in the substrate layer occurs at  volume fraction 1.5%, has an increase of 114.03% from the joint beam without steel fibers while the addition of steel fibers in the overlay layer occurs at volume fraction 2%, has an increase of 8.66% of the joint beams without steel fibers.
Co-Authors Aditia Reshi Dista Fikri Alami Laskmi Irianti Mohd. Isneini Mufidah Aulia Annisa silsila jana firdasa Surya Sebayang Todo Herdyson Sitohang Tri Ratna Utami Vera Agustriana Noorhidana Yoga Marta Agustiawan