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All Journal IPTEK Journal of Proceedings Series Jurnal Dimensi Pratama Teknik Sipil Rekayasa Sipil Journal of Civil Engineering Civil Engineering Dimension
Willy Husada
Petra Christian University
Civil Engineering, Building, Construction & Architecture Computer Science & IT

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Journal : Civil Engineering Dimension

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Optimization of Counterfort Retaining Wall Structure with Shear Key using Metaheuristic Method Gogot Setyo Budi; Joel Glenn Chandra; Bryan Saputra Ongkowardhana; Willy Husada
Civil Engineering Dimension Vol. 26 No. 2 (2024): SEPTEMBER 2024
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9744/ced.26.2.151-159

Abstract

This paper presents the optimization work to obtain the most econo­mical of counterfort retaining wall structure with shear key attached at its base using metaheuristic method. The metaheuristic algorithm is a global optimization method that can be used to find the optimum solution of complex problems. In this research, optimization is carried out using the Particle Swarm Optimization (PSO) and Symbiotic Organisms Search (SOS) methods. This research utilizes a retaining wall sitting on stiff clay layer subjected to ten (10) m of granular soil of backfill. The scope of the study is limited to the material cost, that consists of the cost of concrete and reinforcement bars, of the counterfort retaining wall with shear key. The results show that the SOS algorithm resulted a lower cost and relatively faster in obtaining optimum retaining wall design compared to that of the PSO algorithm.
Vehicle Routing Problem Optimization for Rebar Material Distribution using the Symbiotic Organisms Search Method Reynaldo, Ambrosius Matthew Junius; Husada, Willy; Wijaya, Ezra Kenzie; Vaphilio, Denish
Civil Engineering Dimension Vol. 27 No. 2 (2025): SEPTEMBER 2025
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9744/ced.27.2.203-213

Abstract

The success rate of construction projects depends on subcontractors and material suppliers, especially in ensuring the material delivery to avoid delays and cost overruns. The Vehicle Routing Problem (VRP) addresses transportation management to minimize the distribution costs. This study presents a comparative analysis of three VRP scenarios: the existing case, the Capacitated Vehicle Routing Problem (CVRP), and the Capacitated Vehicle Routing Problem with Time Windows (CVRPTW). The Symbiotic Organisms Search (SOS) method is used to solve the VRP of a building materials supplier in Sulawesi, Indonesia in delivering rebar to 19 locations over 12 weeks while considering the vehicle capacity and the time window constraints. The results show that the SOS method effectively handles the rebar distribution problems with these constraints. The CVRP scenario achieves a total cost saving of Rp 23,263,278 (26.15%), while the CVRPTW scenario saves Rp 6,732,942 (7.57%).
Co-Authors Aland Kane Ujuto Bryan Saputra Ongkowardhana Christoffel Felio Thamrin Doddy Prayogo Doddy Prayogo Gogot Setyo Budi Hogianto, Josh Felix I-Tung Yang Joel Glenn Chandra Putri, Clarissa Arisanti Reynaldo, Ambrosius Matthew Junius Reynaldo, Ambrosius Matthew Junius Ricky Christian Chandra Ronald Herdjijono Tri Joko Wahyu Vaphilio, Denish Wijaya, Ezra Kenzie