Design for Manufacturing and Assembly-Oriented Parametric Modelling of Prefabricated Bridges

Design for manufacture and assembly (DfMA) has become the efficient design method for prefabricated bridge construction which is being popular at present. However, the current design systems are not well suited for combining the parametric design of Building Information Modeling (BIM) with DfMA. In order to solve the problem, this paper introduces the novel concept of DfMA- oriented parametric modelling of prefabricated bridge structures. The new modelling method is the integration of DfMA principles with BIM model parameters to control the process of manufacturing and assembling. Essential considerations for the manufacturing and the assembly should be included in the model definition as rules and geometry authoring algorithm. The primary outcomes are the digital manufacturing model and digital assembly model of bridge members. Digital manufacturing model is required to guarantee the allowable manufacturing tolerance before delivery to the construction site. Preassembly is used to check the allowable tolerances of bridge components and connections. Finally, the DfMA-oriented parametric modelling of a full prefabricated bridge is presented.

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