A Fuzzy structural equation model to analyze relationships between determinants of safety performance in construction sites: development of a safety performance index assessment tool


Thesis Type: Doctorate

Institution Of The Thesis: Middle East Technical University, Faculty of Engineering, Department of Civil Engineering, Turkey

Approval Date: 2015

Thesis Language: English

Student: Mustafa Özdemir

Supervisor: MUSTAFA TALAT BİRGÖNÜL

Abstract:

The principal aim of this study is to examine the relationships between determinants of safety performance in construction sites. In this study, 168 observable variables and 16 latent dimensions affecting safety performance of construction sites were collected together from detailed literature review, expert opinions and face-to-face interviews with 15 construction safety professionals. Relationships between observed variables and latent dimensions of safety performance of construction sites were studied and a multidimensional safety performance model was proposed. Structural equation modeling (SEM) analysis and testing results showed that, all of the research hypotheses were supported and the proposed multidimensional safety performance model was validated. After validation of the proposed multidimensional safety performance model, the formulation of the safety performance index of construction sites was developed. Case studies were conducted at 11 international construction sites and the results of site safety performance indices were benchmarked. A short (simple) safety performance model was developed as an alternative to the full model (proposed model) to assess safety performance of construction sites. Results showed that short model predicts the safety performance with an acceptable accuracy and requires less time to complete. Finally, a safety performance index assessment software tool for construction sites was proposed by developing a Site Safety Performance (SSP) software and an application for mobile devices based on the empirically validated theoretical model. Top 30 of the observed variables most affecting the safety performance in construction sites were discussed and recommendations to construction safety professionals were provided to improve the safety performance of construction sites.