Developing an Inventory Routing Problem Model for Managing Precasting Concrete Distribution in Several Construction Projects

Akhmadi, Althof (2024) Developing an Inventory Routing Problem Model for Managing Precasting Concrete Distribution in Several Construction Projects. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Industri konstruksi sudah bergerak untuk memenuhi konstruksi di lokasi tertentu dengan membuat precasting di pabrik. Kondisi ini mengarahkan manajer proyek untuk menentukan kondisi persediaan dalam yang optimal, dari aspek pengiriman dan penjadwalan produk precasting yang memiliki beban berat. Manajemen inventaris yang optimal, rute pengiriman, dan penjadwalan merupakan aspek yang sangat penting perlu dipertimbangkan dalam situasi ini karena muatan berat memiliki kondisi khusus yaitu hanya satu perjalanan untuk satu kendaraan. Masalah utama dalam penelitian ini adalah koordinasi antara kontraktor dan manajer proyek. Penelitian ini fokus pada pengembangan aplikasi untuk permasalahan inventory routing yang mengintegrasikan kontraktor dan manajer proyek, sehingga dapat menentukan pengelolaan inventaris beberapa kondisi gudang proyek, rute pengiriman yang optimal, dan efektivitas biaya. Informasi tentang inventaris yang ada dikumpulkan dari manajer proyek. Model Inventory Routing Problem (IRP) dengan pendekatan Capacitated Vehicle Routing Problem with Time Windows (CVRPTW) dengan pendekatan nearest neighbor. Informasi inventaris dikumpulkan menggunakan spreadsheet dan diproses dalam Visual Basic for Application (VBA) Microsoft Excel. Validasi dilakukan untuk mengetahui keakuratan keluaran model, dan hasilnya menunjukkan bahwa model cukup akurat dengan kondisi eksisting yang dapat mengurangi rata-rata biaya transportasi sebesar 12%. Eksperimen dilakukan dengan beberapa skenario, dan dapat disimpulkan bahwa strategi pengalokasian jumlah kendaraan dan kondisi geografis mempunyai pengaruh yang sangat penting terhadap tingkat penggunaan kendaraan, penjadwalan pengiriman, dan total biaya. Perencanaan strategis terkait alokasi kendaraan yang optimal dan spesifikasi produk diperlukan untuk menjawab tantangan kegiatan pengadaan ulang.
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The construction Industry already moved to fulfil site construction by making precasting in the factory. This condition leads the project manager to determine the condition of inventory in optimal condition, from aspects of delivery and the scheduling of the precasting products which are heavy loads. Optimal inventory management, delivery routing, and scheduling are very important aspects that need to be considered in this situation since heavy loads have special conditions that only single trip for one vehicle. The main problem in this research is the coordination between contractors and project managers. This research focused on developing an application for inventory routing problems that integrates contractor and project managers that determine the inventory management of several project warehouse conditions, optimal routes for delivery, and cost-effectiveness. The information about existing inventory was collected from the project managers. The model of the Inventory Routing Problem (IRP) with the approach of Capacitated Vehicle Routing Problem with Time Windows (CVRPTW) with the approach of nearest neighbor. The inventory information was gathered using a spreadsheet and processed in Visual Basic for Application (VBA) of Microsoft Excel. The validation was conducted to determine the accuracy of the model output, and the result shows that the model is quite accurate through the existing condition which can reduce on average by 12% of transportation cost. Experiments were conducted with several scenarios, and it can be concluded that the strategy of allocating the number of vehicles and geographical conditions has a crucial impact on vehicle utilization, delivery schedule, and total cost. Strategic planning related to the optimal vehicle allocation and product specification is needed to respond to the replenishment activities challenges.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Inventory Routing Problem, Precasting, Vendor Managed Inventory
Subjects:	Q Science > QA Mathematics > QA402.6 Transportation problems (Programming) T Technology > TE Highway engineering. Roads and pavements > TE7 Transportation--Planning
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Industrial Engineering > 26201-(S1) Undergraduate Thesis
Depositing User:	Althof Akhmadi
Date Deposited:	01 Aug 2024 12:42
Last Modified:	12 Sep 2024 07:19
URI:	http://repository.its.ac.id/id/eprint/110726

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