Evaluation of the use of prefabricated bridge elements with Design for Manufacture and Assembly (DfMA) criteria

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.

DfMA Integrated Assessment Model for Selecting Optimal Design Alternatives in OSC Projects

“…These studies aimed to propose development directions for applying DfMA principles used in the manufacturing sector to the construction sector, but the present study is novel in that it derived specific DfMA assessment items and used these to develop a DfMA assessment model. Finally, studies to propose assessment methods using DfMA have been conducted to select optimal alternatives for OSC projects [19,33]. These studies contribute to identifying the evaluation factors of DfMA as it relates to production efficiency, including the number of components and assembly time, and using these to propose an alternative design assessment method.…”

Improving Construction Industrialization Practices from a Socio-Technical System Perspective: A Hong Kong Case

“…Power is the ability of those who possess the authority to bring about the outcomes they desire; urgency means the degree to which a stakeholder's claim calls for immediate attention; and legitimacy is "a generalized perception or assumption that the actions of an entity are desirable, proper, or appropriate within some socially constructed system of norms, values, beliefs, and definitions" [32]. Environmental protection [34,38] The four attributes of the artifacts identified from the published articles are economics, user friendly, social acceptance, and environmental protection. With respect to CI, 'economics' considers the cost effectiveness of the artifacts, such as prefabricated façades.…”