Folded plate structures made of cementitious composites

由水泥复合材料制成的折叠板结构

• 批准号: 198006311
• 负责人: Professor Dr. Rostislav Chudoba
• 金额: --
• 依托单位: Lehrstuhl und 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 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/198006311?language=en
• 关键词: Folded; plate; structures; made; cementitious

The folding technique exploiting principles of origami is becoming increasingly popular in engineering disciplines and opens up new opportunities also in the field of folded structures with load-carrying function. In combination with novel cement-based composites continuously reinforced with flexible textile fabrics, the folding technique provides an innovative method for design and manufacturing of light-weight structures based on the principle of form follows force. Due to the high adaptivity of the manufacturing process the method lends itself to mass-customization as it complies with the requirements on high variability and economic production. In the first project period, basic components of the design and manufacturing methodology for cement-based folded structures have been developed. New algorithms for the simulation of the folding process and for geometrically based form-finding methods have been mathematically formulated and implemented as plug-ins in the simulation toolkit called oricrete. Based on the conducted simulations, devices controlling the folding process have been developed and validated for singly curved shells based on the Yoshimura crease pattern. The target configuration has been fixed by grout in the crease lines. The mechanical properties of the grouted crease lines have been tested for bending, tensile, transverse and shear loadings. The load-carrying behavior has been analyzed using a finite element model automatically generated by the oricrete toolkit. The goal of the second project period is the extension of the design and production methodology with efficient statically based form-finding algorithms and manufacturing strategies combining several folding approaches. The feasibility of the proposed concepts is to be evaluated on behalf of demonstrator objects. In particular, form-finding methods reflecting the crease line stiffness properties shall be developed and implemented in the oricrete toolkit. This development will address the general need for efficient form-finding methods reflecting the mechanical properties and foldability constraints. The developed methods and algorithms for a geometrically and statically based form-finding will be employed to analyze the formability and static performance of several know crease patterns. The form-finding methods will be validated by geometrically and physically nonlinear analysis of the load-carrying behavior. The developed manufacturing strategies will be used to produce several thin folded specimens for the experimental validation of the simulation results. As a final goal of the project a folded roof structure consisting of several folded segments will be built as a demonstrator of the developed methodology.

利用折纸原理的折叠技术在工程学科中变得越来越流行，并在具有负载功能的折叠结构领域开辟了新的机会。结合新颖的基于水泥的复合材料连续使用柔性纺织织物加固，折叠技术为基于形式原理设计和制造轻量重量结构的创新方法提供了一种创新的方法。由于制造过程的适应性很高，因此该方法适合于大规模定性，因为它符合对高变异性和经济生产的要求。在第一个项目时期，已经开发了基于水泥的折叠结构的设计和制造方法的基本组成部分。用于模拟折叠过程和基于几何形式调查方法的新算法已在数学上制定并实现为插件，称为oricrete。基于执行的模拟，基于Yoshimura折痕模式，已经开发了控制折叠过程的设备，并验证了单个弯曲的壳的验证。目标配置已通过灌浆线中的灌浆固定。灌溉折痕线的机械性能已被测试，用于弯曲，拉伸，横向和剪切载荷。使用oricrete工具包自动生成的有限元模型对负载携带行为进行了分析。第二个项目期间的目标是通过有效的基于静态的形式调查算法和结合了几种折叠方法的制造算法的设计和生产方法扩展。拟议概念的可行性应代表演示者对象进行评估。特别是，应在Oricrete工具包中开发和实现反映折痕线刚度的形式调查方法。这种发展将解决反映机械性能和可折叠性约束的有效形式调查方法的一般需求。将采用几何和基于静态的形式调查的开发方法和算法来分析几种已知折痕模式的形成性和静态性能。形式调查方法将通过对载荷行为的几何和物理非线性分析来验证。开发的制造策略将用于生产几个薄折样标本，以实现模拟结果的实验​​验证。作为该项目的最终目标，将建立由几个折叠段组成的折叠屋顶结构，作为开发方法的演示者。