A task-based safety model for construction projects

Daan Liang, Lingguang Song, Terri Branham

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Construction remains one of the most dangerous occupations in the United States according to labour statistics. In recent years, the opportunity to accelerate the integration of design and construction activities has risen to allow maximum accident reduction while minimising adverse impact on project cost and schedule. This paper introduces anovel safety model formulated upon the statistical relationship between construction trades and their corresponding occupational risks. In the model, a project is broken down into a group of construction tasks for which the potential risk of accidents is estimated based on trade classifications of performing workers, historical accident rates and durations of exposure. When aggregated, these results reflect the estimated level of safety risk for a specific project as derived explicitly from its physical features. The estimate is further refined by incorporating non-physical features such as contract type, contractor's experience, risk-sharing mechanism and site conditions. This model can be applied not only to produce an initial hazard assessment useful to safety professionals but also to allow architects and contractors to evaluate different design options for risk-mitigation purposes.

Original languageEnglish
Pages (from-to)29-40
Number of pages12
JournalProceedings of Institution of Civil Engineers: Management, Procurement and Law
Issue number1
StatePublished - Feb 2011


  • Buildings
  • Risk & Probability analysis
  • Safety & Hazards
  • Structures & Design


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