Methods and Tools for Design and Fabrication of shell-like and thin-walled Concrete Structures with Line Geometry. Short Title: Thin-walled Concrete Structures with Line Geometry.

具有线几何形状的壳状和薄壁混凝土结构的设计和制造方法和工具。

• 批准号: 198226551
• 负责人: Professor Dr.-Ing. Daniel Lordick
• 金额: --
• 依托单位: Fachgebiet Entwerfen und Konstruieren - 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/198226551?language=en
• 关键词: Methods; Tools; Design; Fabrication; shell

From the viewpoint of load bearing, skew ruled surfaces are favourable because they are basically of negative Gaussian curvature. Since ruled surfaces are generated through the movement of a straight line, they are also a good choice for concrete structures: the formwork can be produced from polystyrene foam with a hot wire cutter. Furthermore, at least in the direction of the rectilinear isocurves, straight reinforcement or even prestress is possible.But in construction industry only hyperboloids of one sheet (cooling towers) and hyperbolic paraboloids (hypars) have been used extensively. This selection does not take advantage of the wide range of possibilities for ruled surfaces at all. Moreover, the limitation to those shapes led to standardized components with a repetitive appearance (Silberkuhl-system). By contrast, today there is a demand for unconventional solutions to the question, how individual forms can be produced to reasonable conditions? Despite their importance, ruled surfaces are not yet properly implemented in common CAD software. However, the project »Line Geometry for Lightweight Structures« by the proposer Lordick, processed during the first phase of the SPP 1542, now delivers convenient mathematical foundations. One result is a form-finding tool (plug-in), which strictly operates in the class of ruled surfaces but nevertheless has the option to integrate load conditions.Now we have the task to make this new tool suitable for application and compare it to the known computation methods in the field of structural engineering. In an iterative process, the results of this comparison, along with other form-finding and optimization methods, shall be incorporated into the model of line geometry. The aim is to establish a workflow, which starts from an input-geometry, continues with static optimizations, and finally leads to the creation of the formwork, a workflow, which enables the designer to shape the structure according to the slogan »form follows force«. Our tool for ruled surfaces is a source for novel shapes and structures, for which we want to develop convenient concepts for structural design. These shell-like and thin-walled elements are predestined for textile-reinforced concrete, with or without prestress. We want to verify this by experiments, where we include typical boundary conditions and load cases for our new shell structures. Additionally, thin-walled structures under predominant compression shall be analysed numerically and experimentally with regard to stability failure. We want to evaluate the results of geometric and physical nonlinear finite element calculations in the light of the test results for the ultimate limit state.Within the project the applicants expect innovative building components not only for roofs, but also for beams, piers, and walls. This shall be proofed by a design workshop and a demonstrator.

从承载的角度来看，斜纹面是有利的，因为它们基本上是负高斯曲率。由于直纹表面是通过直线运动产生的，因此它们也是混凝土结构的一个很好的选择：模板可以用热丝切割机从聚苯乙烯泡沫塑料中产生。此外，至少在直线等曲线方向上，可以直接加筋甚至预应力。但在建筑行业中，只有单面双曲面（冷却塔）和双曲抛物面（hypars）得到了广泛的应用。这种选择根本没有利用直纹表面的广泛可能性。此外，对这些形状的限制导致了具有重复外观的标准化组件（silberkuhl系统）。相比之下，今天人们需要非常规的解决方案来解决这个问题，即如何在合理的条件下产生个体形式？尽管它们很重要，但在普通CAD软件中尚未正确实现直纹曲面。然而，在SPP 1542的第一阶段，由提议者Lordick提出的“轻型结构的直线几何”项目现在提供了方便的数学基础。结果之一是一个查找表单工具（插件），它严格地在直纹曲面类中操作，但仍然可以选择集成负载条件。现在我们的任务是使这个新工具适合于应用，并将其与结构工程领域已知的计算方法进行比较。在一个迭代的过程中，这种比较的结果，连同其他找形和优化方法，将被纳入线几何模型。目的是建立一个工作流程，从输入几何开始，继续静态优化，最后导致模板的创建，一个工作流程，使设计师能够根据“形式服从力量”的口号来塑造结构。我们用于直纹表面的工具是新颖形状和结构的来源，我们希望为结构设计开发方便的概念。这些壳状薄壁构件是为纺织钢筋混凝土而设计的，有或没有预应力。我们想通过实验来验证这一点，在实验中，我们包括了典型的边界条件和新壳结构的载荷情况。此外，对薄壁结构在优势压缩作用下的稳定性破坏进行了数值和实验分析。我们希望根据极限状态的试验结果来评价几何和物理非线性有限元计算的结果。在项目中，申请人期望创新的建筑组件不仅用于屋顶，还用于横梁、桥墩和墙壁。这应通过设计车间和演示来证明。