Discrete event simulation and 4D modelling for elevated highway reconstruction projects

This paper presents a modelling approach that can be used by contractors to plan elevated highway reconstruction projects. The proposed model estimates the project duration, productivity rate of the operation, and visualizes the output using 4D modelling. In this paper, the focus is on the demolition and construction of a box girder elevated highways as part of an interchange reconstruction project. The demolition method of the elevated highway’s superstructure is done by cutting and lifting. In this method, the elevated highway’s spans that have been cut are taken down by a crane. Launching gantry is used for full span precast box girder erection. Discrete event simulation is used to develop the simulation templates to mimic the elevated highway reconstruction processes. The templates are implemented in STROBOSCOPE. The developed templates can be used to determine the production rate, and duration of an elevated highway reconstruction project. Activity durations are linked with the 3D model to generate a 4D model using specialized software. The 4D model is used for visualization and analysis of highway reconstruction, which can help in resolving constructability issues. A case study is presented to validate and demonstrate the applicability of the proposed approach.