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PERBAIKAN BALOK BETON BERTULANG YANG TELAH MENGALAMI BEBAN PUNCAK DENGAN BAJA SIKU Masdar Helmi
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 13, No 1 (2009): Edisi April Tahun 2009
Publisher : UNIVERSITAS LAMPUNG

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Abstract

Reinforced concrete beam can crack caused of load which is bigger than it’s capacity. It need aneffort to repair the beam, so the crack appearance and beam failure can be prevented. One of theways to repair is by installation of angel steel beam on out side of beam.The aim of research is to analyze flexural behavior of repaired reinforced concrete beam. Thebehavior contents : flexural strength, crack pattern, and displacement. The dimension of beam is120 mm x 185 mm x 1550 mm which was charged until crack and failed. There are 3 types ofangel steel beam : (50 x 50 x 5) mm, (40 x 40 x 4) mm, (30 x 30 x 3), that are installed in 3positions based on the eccentricity angel steel beam : behind of beam, inside of beam on bottomside, and beside of beam. Dynabolt, 6.5 cm of length and 8 mm of diameter, is installed 3 pieces in500 mm of distance. The sample is charged on 2 points at 1/3 of span.The results show up that the installation of angel steel beam can increase the flexural strengthcompared to flexural strength rest in reinforced concrete beam which had failed, even the originalone. The new crack are appear at around of dynabolt placed that descript there is force transferfrom concrete beam to angel steel beam. The displacement is less than original beam that showup the toughness also increase.
Studi Kinerja Pelat dan Balok Beton Bertulang di Gedung E Fakultas Teknik Universitas Lampung Akibat Getaran Dhea Yulia Resmonida; Masdar Helmi; Fikri Alami
Jurnal Rekayasa Sipil dan Desain Vol 8, No 2 (2020): Edisi Juni 2020
Publisher : Jurnal Rekayasa Sipil dan Desain

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Abstract

In General, the plate of building will restrain the live load from various activities on it. Furthermore, this live load may produce structural vibrations which cause the inconvenient condition for the users.  The study aims to evaluate the vibrations of the plate based on testing on fieldand numerical analysis using SAP2000 Software. The analysis calcutionsaccording to ISO 2631-2 : 2003 and steel design guide 11th series floor vibrations due to human activity The measurement on field shows that the compression strength of reinforced concrete for the plate and beams are between K-350 and K-400 which means both of them are medium quality concrete in addition. Thefrequencies of plate are between 12,94 - 23,29 Hz with the acceleration rates of 0,235 - 1,13 m/s². The numerical analysis results that the frequences of plate in 8,05 Hz and 8,13 Hz frequences due to walking load with the accelerations under 0,5% g. Based on both of analysis is concluded that the plate E building is a rigid structure. Keywords: Beam, Plate, Vibrations and Acceleration .
Studi Model Cerucuk Ferosemen Berlubang Terhadap Kapasitas Beban di Atas Tanah Lunak Masdar Helmi; ardi elsa brina; Fikri Alami; Iswan Iswan
TERAS JURNAL Vol 12, No 2 (2022): Volume 12 Nomor 2, September 2022
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v12i2.715

Abstract

Abstrak Cerucuk ferosemen merupakan salah satu ide yang bisa dijadikan alternatif mengatasi permasalahan tanah lunak akibat rendahnya daya dukung terhadap beban di atasnya. Penelitian ini bertujuan untuk menganalisis kapasitas model cerucuk ferosemen terhadap beban aksial di atas tanah lunak ditinjau dari batas penurunan maksimum 2,54 cm. Terdapat 3 macam kondisi pengujianyaitu cerucuk tunggal berlubang, cerucuk tunggal tertutup dan cerucuk kelompok tertutup pada ujungnya (4 buah silinder). Variasi pengujian cerucuk tunggal berupa lama waktu di dalam tanah lunak, yaitu 1, 3, 7, dan 14 hari. Hasil pengujian dibandingkan dengan perhitungan teoritis.  Deformasi dan tegangan tanah lunak dianalisis menggunakan metode elemen hingga. Hasil pengujian menunjukan bahwa kapasitas terhadap beban meningkat seiring dengan bertambah lamanya perendaman. Pada variabel 14 hari, kapasitas maksimum cerucuk tunggal berlubang sebesar 0,80 kN dan meningkat drastis pada cerucuk tunggal tertutup sebesar 3,53 kN terjadi peningkatan signifikan sebesar 77,33%. Sedangkan kapasitas cerucuk kelompok tertutup memiliki kapasitas sebesar 9,91 kN. Kata kunci: Cerucuk ferosemen, tanah lunak, kapasitas dukung (q ultimit), faktor aman, FEM (Finite Element Method).  Abstract Ferrocement pile is an idea to overcome the problem of soft soil which has a low bearing capacity to the load.. This study aims to analyze the bearing capacity of the ferrocement pile model against axial loads on soft soil in terms of the maximum settlement limit of 2.54 cm. There were three conditions of testing: single pile with a hollow at the bottom, single pile closed at the bottom, and group pile closed at the bottom. The variations of the test were the length of immersed in soft soil, namely 1, 3, 7, and 14 days. The deformation and stress were analyzed using a software of FEM (Finite Element Method). The test results show that the capacity of ferrocement pile to the load increases with the increase in the duration of immersion. In the 14-day variable, the maximum capacity in a single hollow ferrocement pile was 0.80 kN and increased significantly in a single closed ferrocement pile of 3.53 kN, or 77.33%. Meanwhile, the group closed ferrocement pile had a capacity of 9.91 kN. Keywords: Ferrocement pile, soft soil, bearing capacity (Q ultimate), safety factor, FEM (Finite Element Method).