Set-Based Design for Lean Delivery of Reinforced Concrete Structures

摘要CMS 0511044将进行研究，以整合和加强设计，制造和安装钢筋的过程，以实现系统的改进。 今天的螺纹钢行业高度分散。 目前钢筋的交付过程主要是顺序的，采用耗时且无效的提交过程，奖励参与者，阻碍创新并促进局部次优化。 为了揭示过程改进的机会，从整体上看待可施工性。 一个设计是更好的，如果它可以更安全地建造，与缺陷的风险较小，在更短的时间和更低的成本;在更高的水平，但是-和它被认为是在这项研究中的方式-设计的可施工性是一个功能的最佳工作结构化战略的项目。 一个有前途的和新的方法来设计钢筋，精益施工原则，将进行调查。 研究内容包括：（1）定义和开发一种新的方法和元语言来表示设计和构件属性数据，使这些数据可以在钢筋交付的各个阶段进行;（2）制定设计规则，体现知识、技能、和能力的专家一起工作，以确保上级质量的钢筋混凝土结构，同时考虑到具体的他们共同从事的项目的情况;（3）建模工具的衔接和测试，包括基于集合的和可视化，以使团队能够以系统和有效的方式探索具有目标特性的设计方案，并选择满足许多（如果不是全部）约束和偏好的解决方案，以及（4）发展过程和组织对如何在并行工程中吸引多学科专家团队的理解，以便产生比今天的基于点的设计更有价值的设计。 采用这种新方法可能会引导该行业进行重组，以提高其全球竞争力。许多专家参与了钢筋混凝土基本项目的交付。专业化的发展反映了我们今天利用先进的技术理解和能力来构建结构，以满足日益严格的业主和社会要求。 然而，专业化的需求与行业的分散化密切相关，导致交付过程远非最佳。 本研究以混凝土中的钢筋（钢筋）为对象，研究设计者和制造者之间的关系，旨在开发新的理论，并说明其应用实践，以提高钢铁行业这一领域的能力、性能和竞争力。 一个有前途的和新的方法来设计钢筋，精益施工原则，将进行调查。 这些原则的基础是团队合作、探索各种备选方案以及推迟承诺，直到有足够的数据可供团队作出知情决定。 采用这一新的做法可能会引导该行业进行重组，以提高其全球竞争力。

Abstract for CMS 0511044Research will be conducted to integrate and enhance the processes for design, fabrication, and installation of steel rebar in order to achieve systemic improvements. Today's rebar industry is highly fragmented. The current delivery process for rebar is predominantly sequential, employs a time-consuming and ineffective submittal process, under-rewards participants, discourages innovation and promotes local sub-optimization. To reveal the opportunities for process improvement, constructability is viewed holistically. A design is better if it can be constructed more safely, with less risk of defects, in less time and at less cost; at a higher lever, however- and the way it is viewed in this research - the constructability of a design is a function of the optimum work structuring strategy for the project. A promising and new approach to design rebar, following lean construction principles, will be investigated. The research includes (1) definition and development of a new methodology and meta-language to represent data about design and component attributes, do that this data can be carried forward through all phases of rebar delivery; (2) formulation of design rules to reflect the knowledge, skills, and ability of a specialists to work together to assure superior quality of reinforced concrete structures while taking into account the specific circumstances of the project they are jointly working on; (3) articulation and testing of modeling tools including set-based and visualization to enable teams to explore design alternatives with target characteristics in a systematic and efficient way and choose solutions that meet many if not all of their constraints and preferences, and (4) development of process- and organizational understanding of how to engage multi-disciplinary teams of specialists in concurrent engineering in order to generate a design that is of greater value than today's point-based design are. Adoption of this new approach may steer the industry towards restructuring so as to boost its global competitiveness.Numerous specialists are involved in the delivery of capital projects made of reinforced concrete. Specialization has evolved to reflect the advanced technological understanding and capabilities that we exploit today to build structures to meet increasingly stringent owner and societal requirements. The need to specialize, however, has gone hand-in-hand with fragmentation of the industry resulting in a far-from-optimal delivery process. This research focuses on the steel that is used as reinforcing bar in concrete (rebar) and studies the relationships between those who design it and those who make it. The goal is to develop new theory and illustrate its application practice, in order to increase the capabilities, performance, and competitiveness of this sector of the steel industry. A promising and new approach to design rebar, following lean construction principles, will be investigated. These principles build on teamwork, exploration of sets of alternatives and postponement of commitments until sufficient data is available for the team to make an informed decision. Adoption of this new approach may steer the industry towards restructuring so as to boost its global competitiveness.