|M.Sc Student||Raviv Gabriel|
|Subject||Identification and Analysis of Mechanisms for|
Constructability Knowledge Transfer from
Contractors to Designers
|Department||Department of Civil and Environmental Engineering||Supervisors||Professor Emeritus Aviad Shapira|
|Professor Rafael Sacks|
|Full Thesis text - in Hebrew|
The advantages of implementing constructability at early project stages have been studied, but no research appears to have been published in which constructability errors have been tracked back and related to the mechanisms that may have prevented them.
Constructability is defined as the optimal use of construction knowledge, starting at the preliminary design stage and continuing until the completion of construction. The mechanisms for constructability knowledge transfer from contractors to designers are referred to as "constructability tools". These tools are the main subject of this research. The research sought to identify them and grade them according to their effectiveness in the prevention of constructability problems, in general or within the contexts of specific projects.
Data were collected from four projects, which were selected out of 30 construction projects in Israel. Project documents such as change orders, diaries, minutes of meetings and requests for information were examined and revealed a broad picture of design failure instances ("constructability problems") that occurred during construction. The data collected included a large number of issues, which were classified in a set of main groups. The term basic problem was coined to describe groups of problems sharing a mutual cause or interest. The outcome was a generic set of basic problems as well as the distribution of their occurrences, weighted by severity, within the selected projects.
Studying the tools for the prevention of constructability problems requires establishing the relationship between the problems and the tools designated to prevent their occurrences a priori. The issue was raised before a forum of experts who were asked to provide their comprehensive estimates of these relationships.
The quantitative tool that was developed, called the relationship matrix, provided for analysis of the interrelations between the constructability failures and the constructability tools. The matrix was designed to draw general conclusions about the potential benefit of the constructability tools as well as to enable estimation of their potential effectiveness for any given specific project context. Connecting the matrix data with the distribution of the basic problems identified within the project documents enabled drawing conclusions concerning context for each of the projects studied.
The conclusions of the study recognized three main categories of tools: managerial tools, technical tools, and procedural tools. The main lesson learned is that the managerial tools are the most effective, and the technical tools are of secondary priority. The procedural tools were found to be the least effective.