Offsite prefabrication of the non-structural components of residential and commercial low- and high-rise buildings is becoming increasingly popular due to its sustainability, fast on-site execution, safety and cost-effectiveness. The benefits of offsite prefabrication can be further enhanced if it is coupled with the principles of Design for Manufacturing and Assembly (DfMA), which is based on materials, labours and cost optimisation. Although DfMA has been widely used in automotive and other industries, it is not well-established in the offsite prefabricated construction industry. Moreover, there are no guidelines exist for applying DfMA in prefabricated construction. In this paper, DfMA principles are applied to the most common non-structural members i.e., timber frame wall and the plumbing drainage system of a local residential building in Melbourne, Australia. Site and factory observations for the manufacturing of these components were carried out to collect actual assembly times. Then, using the collected data, the design efficiencies of onsite-, offsite- and DfMA-based prefabrication were computed by developing a user-friendly tool through advanced MATLAB programming. Moreover, from a cost-benefit analysis, DfMA-based prefabrication was found to be better than conventional factory prefabrication of selected non-structural components. Furthermore, based on the results, a pragmatic framework for DfMA based design and execution in a real prefabricated construction project is proposed. The findings of this paper are significant as they can contribute to developing guidelines for DfMA based design of prefabricated non-structural components of residential buildings.

住宅和商业低层和高层建筑的非结构组件的异地预制由于其可持续性，现场快速执行，安全性和成本效益而变得越来越受欢迎。如果异地预制与基于材料，人工和成本优化的制造和组装设计（DfMA）原理相结合，则可以进一步提高其优势。尽管DfMA已广泛应用于汽车和其他行业，但在异地预制建筑行业尚不完善。此外，尚无关于在预制建筑中应用DfMA的准则。本文将DfMA原理应用于最常见的非结构性成员，即 木结构墙和澳大利亚墨尔本当地居民建筑的排水系统。对这些组件的制造进行了现场和工厂观察，以收集实际的组装时间。然后，使用收集的数据，通过先进的MATLAB编程开发一种用户友好的工具，计算基于现场，异地和DfMA的预制件的设计效率。此外，从成本效益分析中，发现基于DfMA的预制优于选定的非结构组件的传统工厂预制。此外，基于结果，提出了在实际的预制建筑项目中基于DfMA的设计和执行的实用框架。