Cross Sectional Adaption for Rod-Shaped Element in Compression

压缩时杆状元件的横截面适应性

• 批准号: 198118038
• 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 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/198118038?language=en
• 关键词: Cross; Sectional; Adaption; Rod; Shaped

The aim of the applied continuation phase is the optimisation of tubular shaped compression members which occur in constructions as columns. Columns carry the vertical loads of structures of the construction dead and live loads. Usual columns have rectangular or circular cross-sections. Depending on acting loads and the construction of the connection area between column and the adjacent members, different areas of the columns are more or less stressed and also the bearing behaviour of the adjacent members is influenced. It is aimed to develop optimised geometries for columns, for which the typical failure mechanisms of columns due to exceedance of stress or loss of stability can be excluded by an efficient material utilisation.In investigations during the first project period the factors influencing the bearing behaviour of columns have been determined and the transition points between the different failure types have been determined. At first the influence of the geometrical column form in longitudinal direction of centrically loaded columns has been investigated and optimised cross-sections and shapes in the column axis were found. Based on that the influence of additional bending moments acting on the column were analysed and the resulting principal optimum shapes for basic loading conditions developed. In reality columns are exposed to combinations of different actions, so that at first a characteristic loading scenario has to be chosen to develop an optimised column shape. For the design and construction columns are idealised as uniaxial trusses, but for the construction also the connection point to the slabs is important and was investigated. Thereby the positive influence of the developed column shape was found, because a haunching of the column ends improves the load transfer between slab and column and the overall behaviour of the structure.In the applied project period the developed column shapes for basic loading conditions are to be optimised for certain characteristic loading cases. Therefore numerical calculation will be done and the results verified by experimental investigations. As the result a column shape according to form follows force is developed which is also material- and resource-efficient. A separate focus lies on the connection point between column and slab under consideration of local problems, as e.g. the punching of slabs. Therefore a close cooperation with the project Lightweigth Ceiling Structures Made of Layered High-Performance Concrete, also applied for by the applicant, is planned. At the end the consolidation of form optimized members to a spatial structure is proven with the development and construction of a demonstrator.

应用延续阶段的目的是优化管状受压构件，这些构件作为柱出现在建筑中。立柱承担建筑结构的竖向荷载和活荷载。通常的柱有矩形或圆形的横截面。根据作用荷载和柱与相邻构件之间连接区的构造，柱的不同区域或多或少地受到应力的影响，并影响相邻构件的承载性能。在第一个工程阶段的研究中，确定了影响柱承载性能的因素，并确定了不同破坏类型之间的转换点，以期通过有效的材料利用来排除柱因应力过大或失稳而导致的典型破坏机理。首先研究了轴心受压柱纵向几何形状的影响，找出了轴心受压柱的优化截面和形状。在此基础上，分析了附加弯矩对柱的影响，得出了基本加载条件下的主要优化形状。在现实中，柱子暴露在不同作用的组合中，因此首先必须选择一种特征加载方案来开发优化的柱子形状。对于设计和施工，柱被理想化为单轴桁架，但对于施工，与板的连接点也是重要的，并进行了研究。在工程应用过程中，对基本荷载条件下的柱形状进行了优化，以满足某些特殊荷载工况的要求。因此，将进行数值计算，并通过实验研究对结果进行验证。结果，根据形状随力而定的柱形状被开发出来，这也是材料和资源的有效利用。在考虑局部问题时，另一个重点是柱和板之间的连接点，例如板的冲压。因此，计划与申请人申请的Lightweigth高性能混凝土分层天花板结构项目密切合作。最后，通过样机的研制和施工，验证了将形状优化构件加固为空间结构的可行性。