Light weight biaxial slabs as bionic structures

作为仿生结构的轻质双轴板

• 批准号: 198421558
• 负责人: Professorin Dr.-Ing. Martina Schnellenbach-Held
• 金额: --
• 依托单位: Institut für Massivbau
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/198421558?language=en
• 关键词: Light; weight; biaxial; slabs; bionic

The adaption of natural archetypes ideally leads to lightweight bearing systems. Particularly reinforced concrete slabs provide a high-design potential and also have an optimized material consumption.The goal of this research project is the development of lightweight, material-saving and stable concrete slabs as a bionic structure. By the adaption of three natural models the flow of force will be optimized. This leads to an improvement of the bending and shear bearing behavior with optimized material consumption. Another effect is the reduction of costs and resources as well as a contribution to sustainable construction methods. Not only the flow of forces will be optimized, also the conventional forms of the bottom side of concrete slabs can be replaced by nature inspired innovative designs. In the first research period of the project fundamentals were carried out for the development of bionic structures. Three different natural structures were adapted for structural concrete and worked out with self-developed optimization methods, FE-simulations and experiments. The inner structure of slabs will be optimized by improved void formers (1), the bearing capacity is improved by geometries like ribs, haunches and curvatures (2) and the bearing behavior will be optimized by a reinforcement configuration inspired by the principals of a spiderweb (3).Based on the results of the first research period, the basic structures are combined, so that a further improvement of the bearing capacity of a slab is realized in this proposed research project. For that purpose, the developed basic structures will be optimized for suitable combinations.The bearing behavior of bionic components is improved by the use of modern high performance concretes ((micro reinforced) ultra high performance concrete, high performance concrete, lightweight concrete, fiber reinforced concrete and textile reinforced concrete) and concrete hybrid systems. The different concretes will be selected on the base of the biological growth rule. It will be chosen a concrete type, which is the best to finish the material requirements of the component area.At the moment no models for the description of the bearing behavior exist. Therefore, engineering models based on the results of the research will be developed to describe the structural behavior and serve as a basis for future design models. Thus, the significant modeling and computational effort for the development of innovative concrete structures can be essentially reduced.Not all structure are suitable for the variety of boundary conditions, so that a design tool on the basis of fuzzy logic will be developed that proposes a suitable bionic slab system according to the conditions.

对自然原型的适应理想地导致了轻量化的轴承系统。特别是钢筋混凝土板提供了很高的设计潜力，同时也具有优化的材料消耗。本研究项目的目标是开发轻质、节材和稳定的混凝土板作为仿生结构。通过三种自然模型的适应，力的流动将得到优化。这导致了弯曲和剪切承载性能的改善，并优化了材料消耗。另一个效果是减少了成本和资源，以及对可持续建筑方法的贡献。不仅力量的流动将得到优化，混凝土楼板底侧的传统形式也可以被自然启发的创新设计所取代。在该项目的第一个研究阶段，开展了开发仿生结构的基础工作。将三种不同的自然结构应用于结构混凝土，并采用自行开发的优化方法、有限元模拟和试验进行了计算。板的内部结构将通过改进的空心板(1)进行优化，承载能力将通过肋、肋和曲率等几何形状进行优化(2)，承载性能将通过受蜘蛛网原理启发的配筋配置进行优化(3)。在第一个研究阶段的结果基础上，将基本结构组合在一起，从而实现板的承载能力的进一步提高。为此，开发的基本结构将进行优化，以适合的组合。仿生组件的承载性能通过使用现代高性能混凝土((微细增强)超高性能混凝土、高性能混凝土、轻质混凝土、纤维混凝土和纺织混凝土)和混凝土混杂系统来改善。根据生物生长规律选择不同的混凝土。它将选择一个具体的类型，最好地完成构件区域的材料要求。目前还没有描述承载行为的模型。因此，将在研究成果的基础上建立工程模型来描述结构的行为，并作为未来设计模型的基础。并不是所有的结构都适合不同的边界条件，因此基于模糊逻辑的设计工具将被开发出来，根据这些条件提出一种合适的仿生板系统。