Lightweight ceiling structures made of layered high-perfomance concrete

由层状高性能混凝土制成的轻质天花板结构

• 批准号: 198117966
• 负责人: Professor Dr.-Ing. Manfred Curbach
• 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 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/198117966?language=en
• 关键词: Lightweight; ceiling; structures; made; layered

The aim of the requested extension period is the exploration of the load bearing behaviour of form optimized layered two-way slabs. Due to the stratification of the cross-section, the materials can be arranged according to the existing stress distribution along the cross-section height. Consequently, each of the applied materials can be put to its best possible use. The high compression and tensile stresses at the top and bottom layer of the sandwich structure are carried by thin layers of suitable concrete or by a reinforcement. In the centre of the cross section, which is under less stress, the load transfer can be achieved through special lightweight concretes. These concretes join the top and bottom layer shear rigid. Through an additional form optimization of the bottom layer according to the principle form follows force, the efficiency of the layered slab can be further increased.Fundamental research carried out in the first funding period served to show that slabs with a layered cross section have a significantly lower self-weight than conventional slabs. The main focus of the work was on choosing an ideal material combination. In particular, the core layers load bearing capacity has to be sufficiently high to guarantee the shear rigid connection of the top and bottom layer (without shear reinforcement). In experimental investigations of one-way slabs, the load bearing behaviour of layered slab elements was analysed and the transition zones between the different failure modes were determined. In the requested project period these fundamental findings are to be transferred to two-way slabs. Furthermore, the influence of layered cross-sections on the biaxial load-transfer is to be determined. Toward this aim, two-way slabs will be numerically and experimentally investigated. The mutual verification of experiment and numerical model will be carried out continually. Subsequently, a force flow optimized two-way slab will be developed. An engineering model and a construction recommendation will be provided for the design of form optimized layered slabs. Finally, the insights gained will be transferred to multi-span systems. Based on the results from project Cross Sectional Adaption for Rod-Shaped Elements, which an extension period has also been applied for, a demonstrator will be developed to prove that the form optimized members can be consolidated in one spatial structure.

请求的延长期的目的是探索形式优化的分层双向平板的负载轴承行为。由于横截面的分层，可以根据沿横截面高度的现有应力分布来排列材料。因此，每种应用材料都可以最佳使用。三明治结构顶部和底层的高压缩应力和拉伸应力由合适的混凝土薄层或增强层携带。在压力较小的横截面的中心，可以通过特殊的轻质混凝土实现载荷转移。这些混凝土将刚性剪切连接起来。通过根据原理形式对底层的额外形式优化，可以进一步提高分层平板的效率。在第一个资金期间进行的汇票研究表明，具有分层横截面的平板比传统平板的自重较低。这项工作的主要重点是选择理想的材料组合。特别是，核心层负载轴承的容量必须足够高，以确保顶层和底层的剪切刚性连接（无剪切钢筋）。在对单向平板的实验研究中，分析了分层板元件的负载轴承行为，并确定了不同故障模式之间的过渡区。在要求的项目期间，这些基本发现将转移到双向平板。此外，要确定分层横截面对双轴负荷转移的影响。为了实现这一目标，双向平板将在数值和实验上进行研究。实验和数值模型的相互验证将连续进行。随后，将开发出强力流动的双向平板。将提供工程模型和施工建议，以设计形式优化的分层平板。最后，获得的见解将被转移到多跨度系统。基于项目横截面适应的棒状元件的结果，还应用了扩展周期，将开发一个演示器，以证明可以在一个空间结构中合并形式优化的成员。