From Jointing Systems to Light-Weight Structures: Hybrid, dry-fit beam, surface and spatial structures made of UHPFRC

从连接系统到轻质结构：由 UHPFRC 制成的混合干式梁、表面和空间结构

• 批准号: 198251365
• 负责人: Professor Dr.-Ing. Harald Budelmann
• 金额: --
• 依托单位: Institut für Tragwerksentwurf
• 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 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/198251365?language=en
• 关键词: Jointing; Systems; Light; Weight; Structures

As part of the ongoing SPP1542 the applicants are working on the subproject: development of novel jointing systems for geometrically complex surfaces and beam elements made of UHPC. Focus of the investigation is the development of dry fit jointing systems for thin UHPFRC components for the transmission of compression, bending and shear forces. The main approach is to achieve a high mechanical efficiency through increased precision and geometric complexity in the jointing area. Besides precise fitting the components are axially prestressed by integrated tendon elements. The novel jointing systems are being developed for the following UHPFRC components: Axial loaded and dry fit thin walled pipes for the transmission of compressive forces, bending stiffness node elements of thin walled tubes for guiding forces in beam structures, as well as line shaped dry fit jointing systems for accurate assemble of segmented shell components. The objectives identified in the first funding are reached by the end of the first research-period. The results so far have been published several times. The aim of the subsequent application is now to transfer the previously developed new jointing principles for UHPFRC components into powerful light weight beam, surface and spatial structures. The goal is to increase the load bearing capacity of structural components and systems by intelligent coupling of individual modular beam and shell elements into hybrid, cooperating supporting elements and systems. By combining dry fit rods associated with shear resistant, flat or curved surface elements a variety of relevant building structure types can be realized mainly from the bending load bearing structures towards optimized shells. The preconditions of the first project phase remain valid: Using UHPFRC to improve tension resistance and post cracking behaviour, dry fit jointing and efficient material utilization through prestressing. Since in this research project not all possible combinations of beams and shells in their geometric diversity can be investigated, exemplified three relevant construction practice cases from the possible support element combinations for the research program are selected: combination of beam and shell elements into a uniaxial prestressed girder element, combination of beam and shell elements into an orthogonal biaxial prestressed surface structure and combination of beam and shell elements into curved spatial structures. Depending on the geometric constraints the resulting hybrid structural systems and elements in three dimensional space can work as beams and surfaces as mainly bending loaded component or function as membrane structure.

作为正在进行的SPP1542项目的一部分，申请人正在进行子项目：开发用于几何复杂表面和由UHPC制成的梁单元的新型连接系统。研究的重点是开发用于超薄UHPFRC构件的干配合连接系统，用于传递压缩、弯曲和剪切力。主要方法是通过提高焊接区域的精度和几何复杂性来实现高机械效率。除了精确拟合外，构件还采用综合筋单元进行轴向预应力。新型连接系统正在为以下UHPFRC组件开发：轴向加载和干配合薄壁管，用于传递压缩力；薄壁管的弯曲刚度节点单元，用于在梁结构中引导力；以及线形干配合连接系统，用于精确组装分段壳组件。在第一个研究期结束时，将达到第一次供资中确定的目标。到目前为止，研究结果已经发表了好几次。后续应用的目的是将先前开发的UHPFRC组件的新连接原则转移到强大的轻质梁，表面和空间结构中。目标是通过将单个模块化梁和壳单元智能耦合成混合、协作的支撑单元和系统来提高结构部件和系统的承载能力。通过与抗剪、平面或曲面单元相结合的干配合杆，可以主要实现从弯曲承重结构到优化壳体的各种相关建筑结构类型。项目第一阶段的前提条件仍然有效：使用UHPFRC来提高抗拉性能和开裂后性能，通过预应力进行干配合接缝和有效的材料利用。由于在本研究项目中，并非所有可能的梁和壳的几何多样性组合都可以进行调查，因此从研究项目中可能的支撑元件组合中选择了三个相关的建筑实践案例：梁与壳单元组合为单轴预应力梁单元，梁与壳单元组合为正交双轴预应力面结构，梁与壳单元组合为弯曲空间结构。根据几何约束条件的不同，混合结构体系和构件在三维空间中既可以作为梁和面，也可以作为主要受弯载荷构件，也可以作为膜结构。