Construction Project Scheduling with Time, Cost, and Material Restrictions Using Fuzzy Mathematical Models and Critical Path Method

Abstract

This article evaluates the viability of using fuzzy mathematical models for determining construction schedules and for evaluating the contingencies created by schedule compression and delays due to unforeseen material shortages. Networks were analyzed using three methods: manual critical path method scheduling calculations, Primavera Project Management software ͑P5͒, and mathematical models using the Optimization Programming Language software. Fuzzy mathematical models that allow the multiobjective optimization of project schedules considering constraints such as time, cost, and unexpected materials shortages were used to verify commonly used methodologies for finding the minimum completion time for projects. The research also used a heuristic procedure for material allocation and sensitivity analysis to test five cases of material shortage, which increase the cost of construction and delay the completion time of projects. From the results obtained during the research investigation, it was determined that it is not just whether there is a shortage of a material but rather the way materials are allocated to different activities that affect project durations. It is important to give higher priority to activities that have minimum float values, instead of merely allocating materials to activities that are immediately ready to start.

Creating a Construction Schedule Specyfing Fuzzy Norms and the Number of Workers

“…In [1] authors analysed the implementation of fuzzy sets in schedule planning when time, costs and resources were limited. [12] presented the usage of fuzzy sets for the assessment of uncertainty caused by the duration of a construction project.…”

“…Subsequently, reasons for the adoption of this approach are provided andillustrated by a number of practical examples of the model's application. 1 Prof., Eng., Cracow University of Technology, Faculty of Civil Engineering, Warszawska 24,…”

The Fuzzy Project Scheduling Problem with Minimal Generalized Precedence Relations

“…Castro‐Lacouture et al. () applied fuzzy values to time, cost, and material restrictions using fuzzy mathematical models. Ponz‐Tienda et al.…”

Análise Do Gerenciamento De Múltiplos Projetos Na Construção Civil

“…A eficiência de um projeto de construção depende de muitas variáveis: em relação ao tempo, iniciar mais cedo, terminar mais cedo, iniciar mais tarde, terminar mais tarde; custo normal; certas condições como priorização entre os projetos, orçamento disponível, duração esperada; e de algumas incertezas como atrasos, aumento do tempo necessário ou dos custos e restrições de materiais. Todas essas variáveis, condições e incertezas devem ser levadas em consideração no desenvolvimento de previsões realistas, com o objetivo de minimizar o tempo necessário para completar o projeto e os custos envolvidos (Castro-Lacouture et al, 2009 …”