Integrated management model of production and yard stock for in-situ precast concrete production

Abstract

In-situ production of precast concrete (PC) members is affected by various factors, such as cost, time, quantity, lead-time, number of molds, production cycle, number of cranes, and yard stock area. Particularly, the yard stock area constitutes over 84% of the total required area, considerably larger than the production area. This is important because in-situ production is not applicable if the yard stock area is not satisfied. However, most existing studies related to in-situ production of PC members have focused on the production area, and no study has specifically focused on the yard stock area. Therefore, research on in-situ production, considering various influencing factors centering on the yard stock area, is required. This study developed a system dynamics-based integrated management model of production and yard stock for in-situ production. Cost reduction up to 739,000 USD was demonstrated possible in a case project, wherein the yard stock area was 5,941m2. The influencing factors of in-situ production can be numerically controlled in the proposed model. It is thus possible to perform an effective simulation study and obtain appropriate values of the yard stock area, which varies during the project, under various scenarios based on the real site situations.

Keywords

• precast concrete
• in-situ production
• integrated management model
• system dynamics
• yard stock area