Analyzing the Critical Sources of Dimensional Variability during the Lifecycle of a Steel Framed Modular Construction Project

Abstract

This paper presents a case study which analyzes critical sources of dimensional variability in a modular steel framed construction project. If not managed properly, dimensional variability can lead to conflicts during alignment and interfacing of components and modules. The management of dimensional variability can be expressed in distinct categories based on its impact on structural safety, constructability, aesthetics and functionality. This case study explores the use of a laser scanner and a total station in order to quantify critical sources of dimensional variability. The results of the case study show that during different project stages (i.e., fabrication, assembly, transportation, handling and erection) that often one of the distinct impact categories governs in terms of the management of dimensional variability. As such, this paper demonstrates how critical sources of dimensional variability can be identified so that they can be properly managed.