An integrated multi-objective optimization model for solving the construction time-cost trade-off problem

Choongwan Koo, Taehoon Hong, Sangbum Kim

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)


As construction projects become larger and more diversified, various factors such as time, cost, quality, environment, and safety that need to be considered make it very difficult to make the final decision. This study was conducted to develop an integrated Multi-Objective Optimization (iMOO) model that provides the optimal solution set based on the concept of the Pareto front, through the following six steps: (1) problem statement; (2) definition of the optimization objectives; (3) establishment of the data structure; (4) standardization of the optimization objectives; (5) definition of the fitness function; and (6) introduction of the genetic algorithm. To evaluate the robustness and reliability of the proposed iMOO model, a case study on the construction time-cost trade-off problem was analyzed in terms of effectiveness and efficiency. The results of this study can be used: (1) to assess more than two optimization objectives, such as the initial investment cost, operation and maintenance cost, and CO2 emission trading cost; (2) to take advantage of the weights as the real meanings; (3) to evaluate the four types of fitness functions; and (4) to expand into other areas such as the indoor air quality, materials, and energy use.

Original languageEnglish
Pages (from-to)323-333
Number of pages11
JournalJournal of Civil Engineering and Management
Issue number3
Publication statusPublished - 2015 Apr 3

Bibliographical note

Funding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (No. NRF-2012R1A2A1A01004376) and by a grant from High-Tech Urban Development Program (11CHUD-C03) funded by the Ministry of Land, Transport and Maritime affairs, South Korea.

Publisher Copyright:
Copyright © 2015 Vilnius Gediminas Technical University (VGTU) Press.

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Strategy and Management


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