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MEDIA KOMUNIKASI TEKNIK SIPIL
Published by Universitas Diponegoro
ISSN : 08541809     EISSN : 25496778     DOI : -
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture
Media Komunikasi Teknik Sipil (ISSN 0854-1809) published twice in a year, in July and December. The article can be product of researches, scientific thoughts or case study, in civil engineering and isn’t formed by politics, commercialism, and subjectivity unsure. This scientific journal contains articles of thought and research results in Civil Engineering that have never been published in scientific journals or other media.
Arjuna Subject : -
Articles 7 Documents
 1 
Search results for , issue "Volume 12, Nomor 2, Edisi XXIX, JULI 2004" : 7 Documents clear
Pengaruh Pemanfaatan Tempurung Kelapa sebagai Material Serat terhadap Kuat Tekan dan Kuat Tarik Beton Rustendi, Iwan
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 12, Nomor 2, Edisi XXIX, JULI 2004
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (182.39 KB) | DOI: 10.14710/mkts.v12i2.1952

Abstract

Concrete is the one of building material that excisting intense very popular in engineering and contractor as well as in general society. To complete the performance of concrete, several inovation have already made by people that have competen of its. Consider of result from detailed test, material addition that capable to increasing strength of concrete is fiber. Addition fiber for concrete will make great influence for tensile strength of concrete, but for compressive strength is not significan. In this research, will detected how much that influence of coconut shell fiber toward strength from several variation dosis. Sample of concrete is made in four type, first sample with 0% of coconut shell fiber, second sample with 5% of coconut shell fiber, third sample with 10% of coconut shell fiber and the last sample with 15% of coconut shell fiber. From result of detailed test concrete, the compressive strength is to be reduction, but the tensile strength to be increase alowed from increasing coconut shell fiber. With 5% addition of coconut shell fiber the compressive strength is reducted at 19,36% and the tensile strength is increasing at 4,29%, with 10% addition of coconut shell fiber the compressive strength is reducted at 23,00% and the tensile strength is increasing at 19,63% and with 15% addition of coconut shell fiber the compressive strength is reducted at 40,09% and the tensile strength increasing at 36,81%. Key words :      fiber concrete, coconut shell fiber, compressive strength, tensile strength.
Pemodelan Prioritas Pemanfaatan Potensi Air Situ Berbasis Konservasi Sumberdaya Air Hadihardaja, Iwan K.
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 12, Nomor 2, Edisi XXIX, JULI 2004
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (429.204 KB) | DOI: 10.14710/mkts.v12i2.2682

Abstract

Degradation function of Situ Gede (Lake Gede) becomes crucial at present time compared to its function at initial condition when it was used for  tourism, irrigation, and raw water supply within an optimal use. The crucial aspects are related to the decreasing reliability of supply to Situ Gede and increasing sedimentation accumulation. The research concerns with various aspects due to the Situ Gede conservation and restoration that is aimed to increase the potential uses, based on the quantitative and qualitative model by using optimization technique and Analitic Hierarchy Process (AHP). The optimization technique is applied in order to evaluate the amount of monthly  water availability within 3 scenarios i.e. tourism ounly (Scenario 1), tourism and irrigation (Scenario 2), and, tourism, irrigation and raw water (Scenario 3), respectively, based on the potency of Situ Gede itself, new additional supply from other sources, and additional supply from Galunggung Crater. In addition, based on simulation of accumulated sedimentation model, that is aimed to identify the effect of firm outflow change of Situ Gede Release, indicates the decrease of firm outflow around 0,5% annually. The priority order based on AHP evaluation shows that the the first priority is Scenario 1, the second is Scenario 3 and the third is Scenario 2. Those priorities based on various criterias such as Investment Cost and Operation Maintenance, Additional Supply Reliability to Situ Gede, and Sedimentation. Sensitiviy analysis is also applied based on the weight change of each criteria in performing the shift possibilities due to the priority order. Key Words : Non Linear Programming Modeling,  Simulation, Multi objective-Multi Criteria
Studi Perbandingan Metoda WSD dan LRFD dalam Analisa Struktur Anjungan Lepas Pantai Tawekal, Ricky L.
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 12, Nomor 2, Edisi XXIX, JULI 2004
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (351.747 KB) | DOI: 10.14710/mkts.v12i2.2679

Abstract

Up to this moment, most of structural design of offshore platforms are carried out by using traditional Allowable Stress Design (or Working Stress Design) specification adopted in American Petroleum Institute (API RP2A – WSD) Codes. In this method, loads and stresses are calculated  based on linier elastic material and then compare them to the allowable loads and stresses. Recently, Load and Resistance Factor Design specification adopted in API RP2A – LRFD have been developed from the API RP2A – WSD using reliability based calibration. General industry practices recognise that older, existing offshore structures may not meet current design standards. However, many of these platforms that are in acceptable condition can be shown to be structutrally adequate using a risk based assesment criteria that considers platform use, location, and the consequences of failure. In this paper, a comparison study on WSD and LRFD methods in structural analysis of offshore platform is carried out by using a monopod offshore platform model. Structural analysis and unity check are performed by using SACS version 5.1 software. Keywords: working stress design, load and resistance factor design,  offshore structures
Idealized Stress-Strain Relationship in Tension of Reinforce Concrete Member for Finite Element Model Based on Hanswille’s Theory Wibowo, Hardi
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 12, Nomor 2, Edisi XXIX, JULI 2004
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (299.058 KB) | DOI: 10.14710/mkts.v12i2.2680

Abstract

Untuk penganalisaan kontrol retak (crack control) pada model struktur beton bertulang (reinforced concrete/RC) menggunakan software finite element seperti DIANA diperlukan pemodelan hubungan tegangan-regangan (stress-strain relationship). Data model hubungan tegangan-regangan ini dalam rangka mengakomodasi efek rekatan (bond-slip effect) antara tulangan (reinforcement) dengan beton (concrete) yang melingkupinya. Hubungan tegangan-regangan yang diperlukan adalah nilai rata-rata tegangan-regangan pada tulangan dan beton. Data hubungan tegangan-regangan rata-rata ini bisa diturunkan dengan menggunakan teori Hanswille. Pada tulisan ini akan diuraikan mengenai teori Hanswille untuk menentukan hubungan tegangan-regangan tersebut dan diberikan satu contoh perhitungan dan curva hubungan tegangan-regangan rata-rata dari sebuah batang beton bertulang.
RETRACTION: Investigate Buckling Loads of Columns of Regular Polygon Cross-Section with Constant Volume and Clamped Ends Priyonggo, Kantun
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 12, Nomor 2, Edisi XXIX, JULI 2004
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/mkts.v12i2.2678

Abstract

This article has been retracted by Publisher based on publication misconduct by the author.Metode numerik dikembangkan untuk menghitung beban perlawanan kolom meruncing keujung dari penampang melintang poligon teratur dengan volume konstan dan kedua ujungnya dijepit. Keruncingan linier, parabolik dan sinusiodal dipertimbangkan dalam contoh numerik. Dari hasil numerik, kolom yang paling kuat adalah dengan tipe keruncingan dan jumlah sisi penampang melintang poligon teratur dapat diketahui.Kata kunci : Beban perlawanan, volume konstan, kolom yang paling kuat, keruncingan kolom
Pengaruh Penambahan Serat Nylon terhadap Kinerja Beton Adianto, Yohanes L.D.; Basuki, Tri
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 12, Nomor 2, Edisi XXIX, JULI 2004
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (220.386 KB) | DOI: 10.14710/mkts.v12i2.1951

Abstract

Concrete is composite material composed by aggregate and covered by portland cement matrix filled the spaces among particles, which makes a solid material. One of the important properties of concrete is ductility. Low ductility of concrete is presented by stress-strain curve, which has fast decrease of compressive strength in post peak load area, so collapse happen in relatively immediate. Nylon fiber has lower modulus of elasticity than concrete. The using of fiber is expected able to produce concrete more ductile. The objective of this research is to explore the effect of one kind polymeric fiber, nylon, in normal concrete (fc’= 30 MPa). The result shows that there is no significance difference in compressive and flexural strength in concrete with varied nylon fiber content, but there is significance difference in compressive strength among varied age of concrete. There is significance difference in modulus of elasticity of concrete. The modulus of elasticity will increase in line with the decrease of nylon fiber content.  This research show that higher fibre content added to the concrete, the concrete will show higher strength in cyclic loading.Key words: nylon, fibre, normal concrete, compressive strength, flexural strength, modulus of elasticity.
Persoalan Proses Kalibrasi Model Perkiraan Banjir Daerah Aliran Sungai Besar Studi Kasus DAS Bengawan Solo Sobriyah, Sobriyah
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 12, Nomor 2, Edisi XXIX, JULI 2004
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (331.954 KB) | DOI: 10.14710/mkts.v12i2.2681

Abstract

Rainfall runoff model with system approach do not interested of the process that happened on the land, but its more interested of the truth of the result which is obtained through calibration. The problem emerge and its  started from the existing data condition. The existing of rainfall data have different range of time and it owning many empty data. The areal precipitation analysis by Thiessen’s methode get difficulty because its polygon fluctuate. For large catchment with some place of Automatic Water Level station, the chosen of streamflow represent the time series of streamflow from the upstream to the downstream. Some gathered data indicate that the upstream hydrograf is high but the downstream hydrograf is low, or on the contrary. Most of Bojonegoro’s hydrograph data has smaller volume than its upstream hydrograph. For the overcome of this problem its used the various method, so that result of calibrating is satisfy Key Words : calibration problem, rainfall-runoff model, large catchment

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