By integrating physical 3D elements with time, 4D technology provides a comprehensive tool to visualize construction sequences as part of an interactive experience. With years of development, 4D technologies were adopted in more and more projects, to improve crew coordination, shorten the construction period, and to reduce request for information. Though research that improves the productivity of 4D tools exists, most studies so far failed to keep synchronization between work schedules and animations and are not capable to verify the 4D model automatically. By evaluating commonly used 4D visualization tools, the pros and cons are concluded in this article. Then, a schedule-driven 4D model is proposed, which consists of physical element model, geometry model, schedule model and visualization model. With this model, different construction operations can be represented by colors, textures, and transformations. What’s more, processes for model verification and frame rendering were proposed in this research. Finally, demonstration of this model was implemented in the construction of a cable-stayed truss bridge over the Yangtze River. It is illustrated that with automatic model verification and a better visualization, the proposed model can reduce rework and mistakes. Future improvements of the model are also discussed in this article. .
2013.10-2016.10: Digital Development of Industrial Residential Projects based on Lifecycle Mangement Ministry of Science and Technology