Algorithms for in-situ production layout of composite precast concrete members

In general, precast concrete (PC) construction is preferred to reduce construction time, improve the quality of buildings and reduce costs. This type of construction consists of in-plant or in-house production, transportation and on-site erection processes. However, the PC construction method based on in-plant production is less effective in terms of cost compared to an in-situ construction method. According to previous studies in Korea, in-plant production cost of PC members accounts for 75-77% of total cost of PC framework, transportation cost is 7-10% and erection cost is 15-17%. If qualitative in-situ production is possible, more than 10% of in-plant production cost and 7-10% of the transportation cost can be reduced, resulting in better cost competitiveness. Yet, in-situ production of PC members has complicated issues such as securing site traffic and resolving interference with other work. This study is intended to develop algorithms that can quickly establish a production layout plan by considering in-situ production factors affecting composite precast concrete members. Usefulness of the developed algorithms has been demonstrated through a case study. (C) 2014 Elsevier B.V. All rights reserved.