Delay analysis considering production rate

There are various methods offered in construction literature for determining the schedule impact resulting from delays and interruptions. Previous scheduling technique makes the assumption that the relationship between time and the number of units produced is linear. Accordingly, progress is assumed to be equally distributed along the activities' durations. Often this assumption does not reflect the real situation for the progress of construction activities. Some activities are naturally nonlinear and others exhibit nonlinear progress. To insure reality and reasonableness, delay analysis must allow for nonlinear production rates as well as linear production rates in the delayed activities. Therefore, there is a need for a delay analysis method that incorporates the varying rate of production for the delayed activities. This paper proposes a delay analysis method that can rationally apportion the concurrent delay with consideration of the nonlinear production rates of activities in construction projects. A simple case study has been implemented to demonstrate the accuracy and usefulness of the proposed delay analysis method. This research is useful for both researchers and practitioners for the case including the varying productivity due to delays and interruptions and allows transparent and rational analysis on concurrent delay to facilitate claim analysis. Key words: claims, critical path method, delay analysis, productivity, scheduling. La litterature sur la construction comporte diverses methodes pour determiner l'impact sur l'horaire engendre par des retards et des interruptions. L'ancienne technique d'ordonnancement presumait que la relation entre le temps et le nombre d' unites produites etait directe. Ainsi, le progres est presume etre distribue egalement entre les durees des activites. Mais souvent l' hypothese ne reflete pas la vraie situation du progres des activites de construction. Certaines activites sont naturellement non lineaires et d' autres progressent de maniere non lineaire. Pour permettre sa fiabilite et sa raisonnabilite, l' analyse des retards doit permettre des taux de production non lineaires aussi bien que des taux de production lineaires dans les activites retardees. Ainsi, il faut une methode d'analyse des retards qui incorpore le taux de production variant dans le temps pour les activites retardees. Le present article propose une methode d'analyse des retards qui peut repartir de maniere rationnelle le retard concourant en tenant compte des taux de production non lineaires des activites des projets de construction. Une simple etude de cas est presentee pour demontrer la precision et l'utilite de la methode d'analyse des retards proposee. Cette recherche est utile aux chercheurs et aux praticiens dans les cas comportant une productivite variable en raison des retards et des interruptions et elle permet une analyse transparente et rationnelle des retards concourants afin de faciliter l' analyse des reclamations. Mots-cles : reclamations, methode du chemin critique, analyse des retards, productivite, ordonnancement. [Traduit par la Redaction]
Introduction Delays and suspensions, as well as work accelerations required to overcome delays and suspensions, are the primary contributors to the cost overruns that affect many projects (Smith et al. [...]