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Workshop on Construction-Aware Design
March 18 - 19, 2019
Campus Library, Level 3, Room 3118, Seaside

AgendaTalk Details

Bim-Based Model for the Automatic Generation and 4-D Scheduling for Concrete Skeleton: A Graph Theory Approach

11:00 - 11:45 Campus Library, Level 3, Room 3118, Seaside

This research presents a model framework that extracts building elements, along with their topological relationships and geometrical properties, from an existing fully designed Building Information Model (BIM Model) to be mapped into a directed acyclic Elemental Graph Data Model (EGDM).

With the rapid increase in complexity in the building industry, project managers are facing more and more complex decision environments and problems. Therefore, it would be beneficial to aid project managers in making sound decisions regarding the intelligent knowledgeable selection of the optimal construction methodology for concrete skeletons while making use of Building Information Modelling (BIM). 

This research presents a model framework that extracts building elements, along with their topological relationships and geometrical properties, from an existing fully designed Building Information Model (BIM Model) to be mapped into a directed acyclic Elemental Graph Data Model (EGDM). The framework incorporates BIMbased search algorithms for automatic deduction of geometrical data and topological relationships for each building element type. The EGDM can undergo a broad range of measures that aids in discovering more information about the construction of the project under study. By electing elemental construction method(s) available in the construction site for each element category, Elemental Construction Method Graph(s) (ECMG) are generated, and Entra-elemental relationships are added in order to mimic any practical constraints in real life. Using graph search algorithms, Depth First Search (DFS) and topological sortings, and an innovative Genetic Algorithm (GA) inspired by Tabu Search (TS), possible construction sequences are generated. The sequences were, then, simulated, hence, recommending the Optimized Elemental Construction Method, Schedule & Resources, and, hence, generating 4D BIM models.

An application was developed to implement the framework and test its robustness. Results revealed an improvement in project's total construction duration, a significant saving in the time of generation of the 4D construction schedule, in addition to human interference elimination. Moreover, this shows how promising the area of planning through the generation of construction sequences is.