The actual completion time of construction projects is rarely in accordance with initial plans. This is due to unforeseen events that affect the project execution. In the paper, the authors propose a method of improving the construction schedule reliability. The method is based on the idea of buffers allocation, whose proper sizing helps to reduce negative effects of random conditions on the progress and efficiency of project activities. The authors adopt a proactive approach to the construction of robust schedules to cope with multiple disruptions during project execution, applicable to two processes starting policies (as soon as possible or no sooner than on a predefined date). The proposed method, based on simulation technique and mathematical programming, was illustrated by an example. The results obtained by means of the proposed method were compared, in terms of schedule stability, to those of the float factor heuristic and starting time criticality heuristicprocedures. The method allowed reducing cost of deviations from the planned activity start dates in random conditions. Santrauka Tikrasis statybos projektų baigimo laikas retai atitinka pradinius užsibrėžtus planus. Taip yra dėl nenumatytų atvejų, kurie daro įtaką galutiniam projekto baigimo laikui. Šiame straipsnyje autoriai pristato metodą, kuris pagerina statybos grafikų patikimuma. Jis grindžiamas laiko rezervo paskirstymo idėja, padedančia sumažinti neigiamus atsitiktinių trikdžių poveikius vykdant projektą. Autoriai pritaiko veiksmingą būdą, kuris leidžia išvengti daugelio sutrikimų vykdant projektą. Siūlomas metodas pagrįstas modeliavimu ir matematiniu programavimu, darbe pateiktas jo taikymo pavyzdys. Gauti rezultatai, taikant siūlomą metoda, buvo lyginami įvairiais požiūriais. Metodas leidžia sumažinti išlaidas, kai atsitiktinėmis sąlygomis nukrypstama nuo planuojamų terminų.
Abstract. Resources selection and allocation at the project planning stage is an important issue for reducing project cost, duration and risk. Existing planning and scheduling methods overlook aspects of limited production capacity of construction companies (contractors) due to the fact that they are simultaneously engaged in realization of some projects. This paper presents a new methodology for project scheduling with repetitive processes using Petri nets based approach. The paper starts with an overview of current developments in the Petri nets theory. We then propose an effi cient computational method based on simulation of Petri net model for construction project planning and subcontractor agreement analysis. An example of construction project simulation research is presented to illustrate the method of project planning and resources allocation.
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