Parametric three-dimensional modelling of buildings is assumed to offer numerous advantages over computer-aided drafting for structural engineers. Assessment of the extent and nature of the potential benefits is a difficult task because 3D modelling has yet to be adopted in practice. Research based on benchmarking existing practice at the level of distinct engineering activities for complete projects, coupled with full-scale modelling experiments, has been pursued in an effort to estimate the degree of productivity gain and to identify local process impacts and changes for precast and cast-in-place reinforced concrete structures. The experimental results completed to date show that a structural engineering practice should be able to significantly increase its productivity. The degree of benefit that can be achieved is primarily dependent on the proportion of drawing production activity to the firm's overall activity, because the greatest increase in productivity is achieved in this area, ranging from 21 % to 61 % for cast-in-place reinforced concrete structures
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