Abstract
The increasing need for bridge infrastructure in Indonesia requires an efficient and lean construction process. The aim of this research to evaluate the use of precast concrete elements on bridges based on the Design for Manufacture and Assembly (DfMA) criteria. DfMA is a principle design that considers the process of manufacture and assembly components based on the following criteria, i.e., simplificity of design, number of components, standardization on elements or material and ease of handling. Analytical Hierarchy Process (AHP) is used to determine the weights for each criteria. Data were collected through observations on a bridge project, interviews with engineers and questionnaires. A typical girder and slab bridge is used as an object for DfMA-based evaluation. The results of evaluation design of prefabricated components to recommend some that are suitable for use in bridge construction. The last case study was taken to one of the bridge construction projects on the newly completed highway is done to identify the prefabricated components used. Bridge analysis and re-design are carried out with the DfMA concept, including costs incurred, resource scheduling and discussions of project risk. The results of analysis with simulation design giving efficiency 28,83% simplificity of design; 8,74% number of components and standardization on elements or materials; 25% ease of handling; 51,53% assembly time; 23,39% cost of work and 18,87% duration time. Finally, the level of risk of work received such as weather conditions and work safety is reduced. In closing, recommendations were given for further DfMA development.
Highlights
The availability of infrastructure is an important and vital aspect to accelerate the national development process
The first step of the study is given the Design for Manufacture and Assembly (DfMA) category for bridges based on references which related to the standardized of bridge design in Indonesiain where show on Table 1
Design for assembly (DfA) index is a result of multiplication between the sum of the minimum theoretical parts and the basic assembly time of each component divided by the total installation time as a whole
Summary
The availability of infrastructure is an important and vital aspect to accelerate the national development process. On the traditional bridge construction it is often criticized for being inefficient and unsafe [1]. To overcome this through the Accelerated Bridge Construction (ABC) program, which is a construction management system with the use of more prefabricated technology in the implementation process [2]. Applying prefabrication with the main characteristics of assembly on bridge elements is an effort to standardize products or components through the factory [3]. The design stage plays a crucial role in determining the resources, costs, time and others for the production and assembly process. One way to evaluate the design of a product is with the Design for Manufacture and Assembly (DfMA). Some DFMA requirements can be used at various levels of complexity [4]
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