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Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains
Published by Universitas Riau
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Core Subject : Engineering,
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Articles 3,145 Documents
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Analisis Beban Ledakan Dan Pengaruhnya Terhadap Struktur Portal Baja Joni, Mustika; Suryanita, Reni; Kamaldi, Alfian
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Bomb explosions in Indonesia have occured relatively more frequently and become a real threat to society. In the blast phenomena, loss of life and injuries to occupants can result from the structural collapse. Therefore it were necessary to do an analysis of the effect under blast load on the building with the aim of this research was to analyze the condition of the frame on a structure based on analysis of internal forces and structural response due to blast load. The building structure model was a steel frame structure of 5 story with a typical floor to floor height of 4 m. Variations of explosive weights of 500 kg and 1.000 kg of TNT were applied to a building structure model have converted into a static load at distance 25 m of blast source. To define the blast load on the structure, ATBLAST software will be used, and to determine blast load parameters need to be calculated with Pythagoras Theorem based on TM 5-1300-1990. Analysis was performed with Finite Element Method (FEM) software with linier static method will be used, the results of analysis were axial and moment force. The axial force was 621,28 kN, moment force weakness axis direction was -665,93 kN-m and moment force strong axis direction was 0,48 kN-m. Based on this analyze it can be concluded that the internal forces have occured proportional to the explosive weights of the building structure and frame conditions in the structure model was considered still allowable to received blast load of 500 kg TNT, however for the 1.000 kg of TNT explosive weights, structure model was collapse.Keywords: Blast load, inform force, linier static
Pengaruh Sosialisasi Zona Selamat Sekolah (ZoSS) Terhadap Efektifitas ZoSS Sekolah Dasar Di Pekanbaru Septian Surya Utama; Yosi Alwinda
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
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Abstract

Many elementary school of the facilities located on the main road so it would be very dangerous for the students when crossing the road. Previous research on the effectiveness of ZoSS conducted by Sri Wahyuni with the results showed that ZoSS not work so effectively with still a lot of behaviors that does not comply with regulations. This research was conducted with the lecture method and distributes some leaflets to determine the effect of socialization to the effectiveness of complex ZoSS at SDN 68 and SDN 75 Balam Street and at SDN 77 and SDN 143 complex Taskurun Street. The result showed that there were some signs missing and faded sign. The Level of service Balam street included for category B and Taskurun street included in category C. The vehicles instantaneous speed (spot speed) in Balam street for motorcycle was 31.38 km/h and light vehicles was 21.96 km/h and at ZoSS in Taskurun street for motorcycle was 25.19 km/h and light vehicles of the 20.16 km/h, but it still exceeded the permitted maximum of speed limit at location ZoSS about 20 km/h. The result of pedestrians behavior are categorized as "already saved" by the student with positive behavior at SDN 68 and SDN 75 by 79%, and SDN 77 and SDN 143 by 69%. For students introducter also categorized as "already saved" by the student with positive behavior at SDN 68 and SDN 75 by 95%, and SDN 77 and SDN 143 by 93%.Keywords: socialization, ZoSS, effectiveness
Model Laboratorium Pola Aliran Pada Krib Permeable Terhadap Variasi Jarak Antar Krib Dan Debit Alirandi Sungai Berbelok Zikri, Ahmad; Mudjiatko, Mudjiatko; Rinaldi, Rinaldi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Crib is a structure that used to adjust the direction of flow of the river to protect riverbanks from direct flow. Laboratory model used to demonstrate the phenomenon of flow patterns that occur in the river’s turn around the crib. Crib models that will be used in this study is a crib with a permeable type with dimensions 0.15 m length, 0.03 m width and 0.15 m height. Materials to be used in permeable crib is a plain iron with 10 mm diameter. The variable in this study is flow rate and distance between the crib. The flow rate varies 0.00134 m³/sec, 0.00298 m³/sec and 0.0056 m³/sec. The distance between crib varies between 30 cm, 40 cm and 50 cm from the beginning of the turn of the river entrance. The flow velocity that occurs around the crib shrink in every variety test. The flow patterns on every variation of the distance between crib with 0.00134 m³/sec of flow rate, the vortex of flow occurs in the early part of the crib. The flow patterns on every variation of the distance between crib with 0.00298 m³/sec of flow rate, the vortex of flow occurs in the early part of the crib. The flow patterns on every variation of the distance between crib with 0.0056 m³/sec of flow rate, the vortex of flow occurs on the side of the crib end. The length of the vortex occurs differently in each variation of the distance between crib at 30 cm, the length of the vortex is relatively short. At a distance of 40 cm, the length of the vortex is relatively long and at a distance of 50 cm, the length of the vortex is quite long.Key word : flow pattern, river’s turn, permeable crib
Analisis Pengaruh Jumlah Pelat Helical Terhadap Kapasitas Daya Dukung Lateral Pondasi Helical Pada Tanah Gambut Rio Hidayat; Ferry Fatnanta; Muhardi Muhardi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
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Abstract

Helical pile can provide an alternative for wood pile over peat soil. The reaserch studied about the effect of amount of helical plates to lateral capacity of helical pile and compared to wood pile and helical without pile. The amount of helical plates used were L, 2L, 3L, LM, and LMS with spacing 50cm. Lateral ultimate capacity was interpreted by Tangent Intersection and. Theoritical lateral capacity of helical pile was calculated using Broms method. Data obtained from experiments in the form of load and displacement described in the normal scale and interpreted by using method tangen of intersection. It is known that increasing the addition of the same diameter of helical plate will increase the lateral bearing capacity of helical pile. But if the bottom of helical plate is smaller then the addition of helical plate no significant effect on the lateral bearing capacity although the helical plate on it larger.Loading experimental results were compared with the result of calculation lateral bearing capacity used Broms method. From the comparison note the lateral bearing capacity of the field is greater than analytical lateral bearing capacity.Keywords: Helical Pile, amount of Helical Plates, Peat soil, lateral Capacity, Wood Pile, pile without helical.
Pengaruh Variasi Bentuk Permukaan Forging Sambungan Las Gesek Rotary Terhadap Kekuatan Tarik Baja Mild Steel Partomuan, Putra; Yohanes, Yohanes
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
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Abstract

Along with the times, welding technology has undergone many developments. The new methods in the process of connecting material are an evidence of developments in welding technology, one of which is friction welding. The friction welding is a welding without using electrode, that the connection between the two materials of welding is obtained a homogeneous connection. The friction welding can also be used to connect cylindrical material or non-cylindrical material. This study aims to analyze the effect of variations in the forging surface (chamfer angle) on tensile strength of welded joints of the rotary friction welding using mild steel. In this study used the mild steel material, which a diameter of 8 mm shaped cylindrical. The cylindrical with a length of chamfer 2 mm and diameter forging of 4 mm by variation of the angle of 300, 450, and 600 were investigated in this research. Then, the rotational speed was 3800 rpm, friction pressure of 4 bars, and the forging pressure of 6 bars were applied in this research. Result showed work piece surface conditions (chamfer angle) affect the value of the tensile strength of steel mild steel. Specimens with diameter forging of 4 mm have a tensile strength value of an average of 424.63 N/mm2, 530.79 N/mm2 and 563.81 N/mm2. The specimen with a chamfer length of 2 mm has an average tensile strength of 585.04 N/mm2, 537.86 N/mm2 and 450.58 N/mm2.Keywords: Friction Welding, Mild Steel, Chamfer Angle, Maximum Tensile Strength.
Analisis Perilaku Kekuatan Kolom Semi Pracetak Akibat Beban Aksial Dan Beban Lateral
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
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Abstract

Semi-precast column uses the combination of cast-in-place concrete and precast concrete. In semi-precast concrete column, difference in compressive strength exists between the cast-in-place and precast concrete. This research aims to investigate the behaviour of semi-precast concrete column by varying the compressive strength of the precast concrete.The semi-precast concrete columns were modeled in finite element analysis software as the connection between column and fondation models. The height of the column models were half of the real column’s height, based on the consideration that the elastic inflection point occurs at half the column’s height. For all column models, the compressive strength of the cast-in-place concrete was 20 MPa. However variations were made for the compressive strength of the precast concrete component: 8 MPa, 12 MPa, 16 MPa, and 20 MPa. The column models were given constant axial loads and inclined lateral loads. The outputs of the finite element analysis software were lateral load-deflection relationship and crack pattern. Based on the analysis results, the magnitude of the lateral load and deflection of the column were proportional to the increment of concrete compressive strength. The cracks that occur at all semi-precast concrete column model were flexural cracks at points with highest bending moment. It could also be observed that the crack pattern was parallel with the stirrups at tension fiber of the column.Keywords: Column, semi-precast, cast-in-place, finite element analysis software
Sifat Mekanis Beton Dengan Menggunakan Steel Slag Sebagai Bahan Subtitusi Agregat Halus Dan Fly Ash Sebagai Bahan Subtitusi Semen Yonna Rosianda; Alex Kurniawandy; Zulfikar Djauhari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
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Abstract

The purpose of research is to identify the mechanical properties of concrete by using steel slag as subtitution for fine aggregates and fly ash as subtitution cement on concrete with the quality (f`c) 25 MPa. The research meant to review the permeability, porosity and load power of concrete. The proportion of steel slag and fly ash which was used is 0% and 20% of total weight of fine aggregates and cements. The permeability and porosity test was done on 28 days soaked concrete. For the pressure test, it was done on 28 days and 56 days soaked in normal water. The result of the test shown that the using of 20% steel slag and 20% fly ash liably improved the permeability and porosity of the concrete. On the normal concrete-pressure test, it was improved as well for 28 and 56 days soaked concrete. Meanwhile, the concrete with steel slag and fly ash as subtitution was also shown an improvement on 28 days and 56 days`s pressure test.Keywords : Steel slag, fly ash, Permeability, Porosity, Compressive strength.
Analisis Stabilitas Bendung (Studi Kasus : Bendung Tamiang) Afrian Firnanda; Manyuk Fauzi; Siswanto Siswanto
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The objective of This study is to analyze the stability of a weir. The weir that is used to analyze is Tamiang weir. This weir is located in Kotanopan Mandailing Natal District of North Sumatra Province. This weir is in Batang Gadis River flow and included in Batang Gadis river flow area. In this study case, the methodology that is used are, the first times is calculating the forces that work against the body of weir. The forces that form the weir body, hydrostatic pressure, mud pressure and seismic. After getting the data, then, these forces are accumulated in four components, they are the vertical forces, horizontal forces, torque resistant, and bolsters moments. From the vertical and horizontal forces will obtain the figure of safety factor for sliding, while the resistant moments and overturning moments will obtain the figure to safety factor for overturning. The input data on this study are the hydrology data, soil data, and weir drawing design. While the output of the safety factor against shear numbers and figures to bolster the safety factor. The results that obtain in this study are 2,35 for sliding safety factor and 3,33 for overturning. Those two results are higher than the stability that required with the minimum safety factor is equal to 1.5. In conclusion Tamiang weir is stable, secure against overturning and sliding.Keywords: weir, sliding, overturning, safety factor, stability.
Analisis Penyebab Keterlambatan Bongkar Muat Barang Akibat Faktor Peralatan (Studi Kasus : Dermaga A Pelabuhan Dumai) Muhammad Safrianda; Rinaldi Rinaldi; Ferry Fatnanta
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
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Abstract

Port is defined as the intersection of land and water transportation nodes withloading and unloading activities of goods. The loading and unloading activities requiredecent equipments to support process. Any equipment that fails to function properly willgreatly delay the loading and unloading process in the port.Several factors that affect loading and unloading delay of goods are due to disabledequipment and human error which are classified into technical factors. These technicalfactors include broken equipment and human errors such as pending truck and operatorarrival.Based on the analysis on PT. Antarindo Wahana Cargo, the company that performsthe loading and unloading activities in Dumai Port A, the main factor which contributes tothe delay was broken equipments. The worst idle time that occurs due to the brokenequipments was 0,69% (5 hours) during February 2015. The offered solution to minimizethe idle time due to the broken equipments: 1) periodic maintenance especially for oldequipments, and 2) renting other equipment to replace the broken equipment so theloading and unloading process could be done timely.Keywords : port, idle time, loading and unloading, equipment, broken equipment
Performansi Mesin Refrigerasi Siklus Kompresi Uap Pada Massa 60 Gram Menggunakan Refrigeran Hidrokarbon Nurul Deswita; Azridjal Aziz; Rahmat Iman Mainil
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
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Abstract

An energy saving and sustainable environmental become an attention of the world nowdays. Replacement of halocarbon refrigerant to hydrocarbon give positive impact to the environment because hydrocarbon is friendly refrigeran for environment with low GWP (Global Warming Potensial and zero ODP (Ozon Depleting Potensial). With the replacement refrigerant, it will cause a change performance on refrigeration machine. This study was conducted to determine the effect of hydrocarbon refrigerants with mass amounts of 60 grams on the performance refrigeration machine. The method used in this study was an experimental method to perform the replacement of halocarbons into a hydrocarbon refrigerant with mass amounts of hydrocarbon refrigerants of 60 grams. The results of the study of refrigerant hydrocarbon with mass amounts of 60 grams was found that the required electrical power for compressor of 0.14 kW, power of cooling of 0.73 kW, the heating power of 0.94 kW, and Coefficient Of Performance of 5.21.Keywords: Refrigeration Machine, Refrigerant Mass, Performance, Hydrocarbon Refrigerants

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