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Analisis Keamanan Jarak Antar Alat Penyambung Geser (Shear Connector) Berdasarkan Distribusi Tegangan Dengan Menggunakan Metode Elemen Hingga Dista, Aditia Reshi; Suyadi, Suyadi; Helmi, Masdar
Jurnal Rekayasa Sipil dan Desain Vol 5, No 1 (2017): Edisi Maret 2017
Publisher : Jurnal Rekayasa Sipil dan Desain

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The function of the shear connector is to keep concrete plate oriental position. The installation of the shear connector will influence the distribution of the stress spread in unevenly on concrete plate. This research aims to analyse the safe distance of shear connector based on distribution of stress in concrete plate. Â This research used software SAP2000 version 14 to find maximum stress on beam then the stress in the plate was analysed by finite element method and Microsoft Excel used base on Kirchoff-Love theories. The analysis result show that maximum stress was located in the middle of span near the support (shear connector). If position of the shear connector not accord with SNI-1729-2015, the plate can crack due to the exceed of modulus concrete crack (fr). The risk of failure increased as line with the wider shear connector distance due to overpass of crack stress.Keywords : Stress, shear connector, plate, finite elemen method, SAP2000.

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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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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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 .

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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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.

Analisis Pengaruh Beban Gempa pada Gedung Tiga Lantai Menggunakan Metode Statik Ekuivalen Nadya Safira; Surya Sebayang; Masdar Helmi
Jurnal Rekayasa Sipil dan Desain Vol 6, No 3 (2018): Edisi September 2018
Publisher : Jurnal Rekayasa Sipil dan Desain

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The purpose of this study is to evaluate the effect of earthquake load on the structure of a third floor school building in West Lampung. The effects of earthquake is reviewed on the dimensions, reinforcement, and deflection of structures by comparing building without earthquake load. The earthquake load calculation using Static Equivalent Method is helped by SAP 2000 program. This program can also produce internal force of the moment, latitude, and normal (M, D, N). The calculation of the slab is calculated by direct design method (DDM). The results of this analysis showed that the calculation of all reinforcement requirements on slab, beams, columns, bore pile foundations, sloof and pile caps in the building with earthquake load 283,3267% is more than compared to the building without earthquake load seen from the number of as on each structure. Dimension design on the structure without earthquake load result that dimension of beams are 250 x 450 mm, coloumns are 350 x 350 mm, diameter of bore piles are 70 cm, sloofs are 250 x 450 mm and pile caps are 1600 mm while the dimensions of the structure with the earthquake load resulted in larger dimensions with dimension of columns are 600 x 600 mm, diameter of bore pile foundations are 80 cm, and pile caps are 1800 mm. Keywords: earthquake load, static ekuivalen, direct design method, and SAP2000.

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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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

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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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.

Fractal Dimension Analysis and Earthquake Repeated Period Estimation in the Southern Part of Sumatra Subduction Zone (Bengkulu-Lampung-Sunda Segment) Syamsurijal Rasimeng; Masdar Helmi; Tugiyono Tugiyono; Suharno Suharno
Indonesian Journal on Geoscience Vol 9, No 3 (2022)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.9.3.383-394

DOI:10.17014/ijog.9.3.383-394An earthquake seismicity parameter study has been conducted in the southern part of the Sumatra Subduction Zone (SSZ) for the period of 1919 to 2019 with a hypocentre depth of 120 km and magnitude of ≥4Mw. The researched area is divided into three segments, Bengkulu, Lampung, and Sunda segments, respectively. This study aims to evaluate the seismicity parameters in the form of a-value, b-value, fractal dimension, and probabilities of earthquake recurrence period. Frequency-magnitude correlation statistical approach introduced by Gutenberg-Richter was used to calculate the seismicity parameters based on catalogue data obtained from USGS. An a-value variation of 5.11±1.84 to 5.85±2.46 obtained indicates the most dominant seismic intensity. b-value of 0.69±0,.17 to 0.83±0.35 correlates with high-stress levels, the level of spatial heterogeneity on the SFZ, and the probabilities of bigger earthquakes in the future. The calculation of fractal dimension of 1.4±0.33 to 1.7±0.71 indicates an earthquake distribution pattern was caused by a single fracture zone along the southern part of SSZ. The fracture zone is located on the left and right sides of the southern part of SSZ, which may not have been connected. In addition, the calculation result of earthquake recurrence period with magnitude ≥6.5Mw indicates that there will be an 5 - 6 earthquake event in the Bengkulu segment, 2 - 3 event in the Lampung segment, and 1 - 2 event in the Sunda segment, while the probabilities of an earthquake with magnitude ≥7.5Mw along the southern part of SSZ is 1 - 2 times.

Fractal Dimension Analysis and Earthquake Repeated Period Estimation in the Southern Part of Sumatra Subduction Zone (Bengkulu-Lampung-Sunda Segment) Syamsurijal Rasimeng; Masdar Helmi; Tugiyono Tugiyono; Suharno Suharno
Indonesian Journal on Geoscience Vol. 9 No. 3 (2022)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.9.3.383-394

DOI:10.17014/ijog.9.3.383-394An earthquake seismicity parameter study has been conducted in the southern part of the Sumatra Subduction Zone (SSZ) for the period of 1919 to 2019 with a hypocentre depth of 120 km and magnitude of ≥4Mw. The researched area is divided into three segments, Bengkulu, Lampung, and Sunda segments, respectively. This study aims to evaluate the seismicity parameters in the form of a-value, b-value, fractal dimension, and probabilities of earthquake recurrence period. Frequency-magnitude correlation statistical approach introduced by Gutenberg-Richter was used to calculate the seismicity parameters based on catalogue data obtained from USGS. An a-value variation of 5.11±1.84 to 5.85±2.46 obtained indicates the most dominant seismic intensity. b-value of 0.69±0,.17 to 0.83±0.35 correlates with high-stress levels, the level of spatial heterogeneity on the SFZ, and the probabilities of bigger earthquakes in the future. The calculation of fractal dimension of 1.4±0.33 to 1.7±0.71 indicates an earthquake distribution pattern was caused by a single fracture zone along the southern part of SSZ. The fracture zone is located on the left and right sides of the southern part of SSZ, which may not have been connected. In addition, the calculation result of earthquake recurrence period with magnitude ≥6.5Mw indicates that there will be an 5 - 6 earthquake event in the Bengkulu segment, 2 - 3 event in the Lampung segment, and 1 - 2 event in the Sunda segment, while the probabilities of an earthquake with magnitude ≥7.5Mw along the southern part of SSZ is 1 - 2 times.

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