While it comes to "Sustainable design", it's usually defined by the concepts like energy consumption optimization, natural sources utilization and environmental protection. Despite of designers focus on these requirements, the financial issues could also affect the sustainability of a design. When a worker injured or dead, it has a direct effect on the financial aspect of the sustainable design beside it is obviously in contradiction to the green design principals. So it may provide a design with the most sustainability when the occupational safety and health, energy conversation and environmental protection come together. To help designers in PtD, a variety of tools have been developed. The newest category of tools are 3D(three-dimensional) and 4D computer-aided-design(CAD) models and Building Information Modeling (BIM) technologies which assist in visualizing 3D components to detect interferences between building systems and spatial-temporal workspace conflicts during construction. This research assessed perceptions about the impact of the implementation of 3D/4D BIM on construction safety. A qualitative survey with a response rate of 62 completed surveys, and based on Iran's construction incidents distribution and happened incidents percentage in 7 primary accident's category, showed that 75% of the respondents thought that construction accidents can be eliminated or lessened through using 3D/4D BIM. The highest three ranking in order of most preventable category of accidents were falls from height, cuts or blows from objects and tools, and thermal contacts or electrical shocks. Beside the safe design idea, sustainable design can also be developed and improved with design suggestions in combination of new design for safety tools and technologies like 3D/4D virtual construction and BIM. This will make ease in correct choices among different designing options and in some cases even would be ended in the new design suggestions.
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