@ARTICLE{Biruk_S._Model_2019, author={Biruk, S. and Jaskowski, P. and Krzemiński, M.}, volume={Vol. 65}, number={No 4}, journal={Archives of Civil Engineering}, pages={295-307}, howpublished={online}, year={2019}, publisher={WARSAW UNIVERSITY OF TECHNOLOGY FACULTY OF CIVIL ENGINEERING and COMMITTEE FOR CIVIL ENGINEERING POLISH ACADEMY OF SCIENCES}, abstract={Most construction projects involve subcontracting some work packages. A subcontractor is employed on the basis of their bid as well as according to their availability. A viable schedule must account for resource availability constraints. These resources (e.g. crews, subcontractors) engage in many projects, so they become at the disposal for a new project only in certain periods. One of the key tasks of a planner is thus synchronizing the work of resources between concurrent projects. The paper presents a mathematical model of the problem of selecting subcontractors or general contractor’s crews for a time-constrained project that accounts for the availability of contractors, as well as for the cost of subcontracting works. The proposed mixed integer-binary linear programming model enables the user to perform the time/cost trade-off analysis.}, type={Article}, title={Model of construction subcontractors selection with time windows for their availability}, URL={http://www.journals.pan.pl/Content/115705/PDF-MASTER/19_ace-2019-0061.pdf}, keywords={construction project, project scheduling, subcontractor selection, discrete time/cost trade-off problem}, }