Complex bridge structures assembled by utilising facetted planar elements made of carbon-reinforced ultra-high performance concrete - Graph-based modularisation and trajectory-sensitive production

利用碳纤维增强超高性能混凝土制成的多面平面元件组装复杂的桥梁结构 - 基于图形的模块化和轨迹敏感生产

• 批准号: 423969184
• 负责人: Professor Dr.-Ing. André Borrmann
• 金额: --
• 依托单位: Lehrstuhl für Computergestützte Modellierung und Simulation
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/423969184?language=en
• 关键词: Complex; bridge; structures; assembled; utilising

Bridge structures are currently mostly characterised by the fact that essential work is carried out on the construction site and the structure is designed/erected individually, either as a whole or from large-scale individual prefabricated members which are connected on site using conventional joining techniques. This results in long construction times, the quality depends largely on the weather conditions and the skills of the personnel used, and an adaptation, replacement of individual components or even temporary use and subsequent dismantling are not possible or only at great expense. Even when using prefabricated parts, no actual modular design with industrial flow production is possible due to the large individual weights, the low degree of repetition and the comparatively high manufacturing tolerances. The basic idea of the research project is to consistently further develop the modularisation principle by using facetted structural elements made of carbon-reinforced ultra-high performance concrete for bridge construction. The approach, comparable with the geometric division of structures into finite elements, is characterised by a systematic division of the overall system into basic partitions ("modules") which are easy to produce. The boundary conditions to be adhered to here result on the one hand from loads and the structural capacity (especially in module joints), on the other hand from the requirements of manufacture and assembly. The complex problem of optimisation can only be solved by a further development of computer-aided methods and the conception of efficient modules, their production and the associated (variable) joining technology. Therefore, suitable joining methods and individual modules made of ultra-high performance concrete adapted to internal stresses are developed and investigated theoretically and experimentally in the project. Short carbon fibres are used as reinforcement, which can be aligned to the stress paths by module production in 3D printing and thus enable a highly efficient load-bearing behaviour. In addition, the modularisation process is systematically analysed and further developed so that segmentation is largely automatic. On the one hand, the boundary conditions resulting from module production and assembly are to be taken into account, and on the other hand, the module arrangement is to be optimised with regard to static aspects. The semi-automated decomposition into modules is to take place by using a rule-based graph substitution system or a graph grammar, so that on the basis of the initial geometry and boundary conditions different arrangement possibilities of the variable basic modules are generated. Both the conceptual and structural-mechanical investigations as well as the investigations for semi-automated modularisation may provide valuable contributions to the overall goals of the SPP.

目前桥梁结构的主要特征是，基本工作在施工现场进行，结构单独设计/安装，作为一个整体或由大型单独预制构件组成，这些构件使用传统的连接技术在现场连接。这导致建造时间长，质量在很大程度上取决于天气条件和所使用人员的技能，并且不可能进行调整、更换单个部件或甚至临时使用以及随后的拆卸，或者只能花费很大的费用。即使在使用预制件的情况下，由于单个重量大、重复程度低和相对较高的制造公差，也不可能实现工业流水生产的实际模块化设计。该研究项目的基本思想是通过使用由碳增强超高性能混凝土制成的多面结构元件用于桥梁建设，不断进一步发展模块化原则。该方法的特点是将整个系统地划分为易于生产的基本分区（“模块”），与将结构划分为有限元的几何分区相比较。这里要遵守的边界条件一方面来自载荷和结构能力（特别是在模块接头中），另一方面来自制造和组装的要求。优化的复杂问题只能通过计算机辅助方法的进一步发展和有效模块的概念、其生产和相关的（可变）连接技术来解决。因此，在该项目中，开发和研究了适用于内应力的超高性能混凝土的合适连接方法和单个模块。短碳纤维用作增强材料，可以通过3D打印中的模块生产与应力路径对齐，从而实现高效的承载行为。此外，模块化过程进行了系统的分析和进一步发展，使分割在很大程度上是自动的。一方面，要考虑模块生产和组装产生的边界条件，另一方面，要在静态方面优化模块布置。通过使用基于规则的图形替换系统或图形语法来进行模块的半自动化分解，使得基于初始几何形状和边界条件产生可变基本模块的不同布置可能性。无论是概念和结构力学的调查，以及半自动化模块化的调查可能提供有价值的贡献的SPP的总体目标。