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All Journal Rekayasa: Jurnal Teknik Sipil Indonesian Journal of Multidisciplinary Science Journal of Social Research
Umar, Usmanul Hayadi
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Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Engineering Environmental Science Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Mathematics Public Health Social Sciences

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ANALISIS FAKTOR PENYEBAB PEMBOROSAN MATERIALPADA PROSES FABRIKASI GBC CHUTE Manalu, Lidia Bernawati Br.; Umar, Usmanul Hayadi; Savitri, Amanatullah
Rekayasa: Jurnal Teknik Sipil Vol 7, No 2 (2022): JURNAL REKAYASA TEKNIK SIPIL
Publisher : Universitas Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53712/rjrs.v7i2.1800

Abstract

Dalam fabrikasi suatu proyek hampir selalu ditemukan waste baik dalam segi waktu maupun dalam segi material. Waste merupakan salah satu penyebab rendahnya produktivitas. Besarnya potensi waste tentu saja akan merugikan owner ataupunkontraktor. Tujuan penelitian ini adalah untuk menganalisa faktor penyebab dari pemborosan material yang terjadi pada saat proses fabrikasi GBC Chute. Metode Penelitian yang digunakan analisis deskriptif dengan observasi dan kuisioner yang respondennya antara lain Project Manager, Workshop Manager, Senior Engineer, serta para pekerja dilapangan. Dari hasil kuisioner yang diperoleh dilakukan pengujian data mengggunkan program SPSS. Pengujian data yang dilakukan meliputi uji validasi, uji reliabilitas, uji korelasi.Selanjutnya dilakukan pengujian model regresi seperti uji t, uji f dan uji koefisien determinasi untuk mengetahui faktor-faktor yang berpengaruh besar terhadap waste.Dari 10 variabelyang diujikan diperoleh 9 variabel valid, pada uji reliabilitas semua indikator mencukupi dan sempurna, Sebesar 96% hasil uji koefisien determinasi terhadap waste konstruksi, Hasil uji f memperlihatkan secara simultan semua variabel mampu menjelaskan hubungannya dengan sangat baik. Dan hasil uji t yang teridentifikasi dari 10 variabel terdapat 7 variabel yang signifikan.
Analysis of building planning over cable stayed bridge: The simulation Resinta, Tria; Rifai, Andri Irfan; Umar, Usmanul Hayadi; Isradi, Muhammad
Indonesian Journal of Multidisciplinary Science Vol. 3 No. 12 (2024): Indonesian Journal of Multidisciplinary Science
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/ijoms.v3i12.988

Abstract

Cable-stayed bridges with box girders are essential innovations in civil engineering, especially for long-span structures. These bridges, reinforced with prestressed cables and box girders, are designed to handle significant loads but remain vulnerable to aerodynamic forces, particularly wind. The vulnerability is measured using the Pb parameter, as defined by the Ministry of Public Works (2015), which helps determine the windbreak structures needed for stability. This study analyzes the aerodynamic stability of bridge decks with widths of 8 m, 13 m, and 19 m on a 420 m bridge, featuring a 220 m main span and two 100 m side spans. The results reveal that the larger the deck width-to-span ratio, the higher the structure's natural frequency, which improves stability. The natural frequency values were recorded at 0.3 Hz for a 7 m deck (3.2%), 0.43 Hz for a 12 m deck (5.48%), and 0.53 Hz for an 18 m deck (8.2%). The most stable span ratio was found with the 18 m deck, with a Pb value of 0.04, showing minimal wind load effects. Moreover, a larger deck width enhances aerodynamic stability and extends the bridge’s service life by reducing damage risk from wind loads.
Bibliometrics Analysis Of The Resistance Of Steel Materials In Building Structures To Fire Valiant, Rizqi; Rifai, Andri Irfan; Umar, Usmanul Hayadi; Isradi, Muhammad
Journal of Social Research Vol. 3 No. 7 (2024): Journal of Social Research
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/josr.v3i7.2096

Abstract

Fire is the out-of-control burning method of flammable substances, which includes wood, paper, plastic, fuel, or different substances, which produce heat, mild smoke, and toxic gases. Fires can occur, including woodland fires caused by lightning or because of human activities, along with building fires due to electric short circuits or errors in the use of fire. In building design, it is miles vital to apprehend the elements that cause fires and the fireplace's resistance to materials. Metal is a form of metallic made from a primary mixture of iron (Fe) and carbon (C), with the amount of carbon typically being much less than 2 per cent of its general weight. Steel is a very common fabric used in a spread of applications due to its aggregate of robust, long-lasting, and malleable properties.
Co-Authors Amanatullah Savitri, Amanatullah Andri Irfan Rifai Manalu, Lidia Bernawati Br. Muhammad Isradi Resinta, Tria Valiant, Rizqi