Model reduction and substructure technique - application to modular shell structures made of ultra high performance concrete

模型简化和子结构技术——在超高性能混凝土模块化壳结构中的应用

• 批准号: 257611820
• 负责人: Professorin Dr.-Ing. Stefanie Reese
• 金额: --
• 依托单位: Rektor der Universität Siegen
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/257611820?language=en
• 关键词: Model; reduction; substructure; technique; application

Shell structures are especially suited for the construction of light-weight buildings, since they can be constructed to have relatively thin dimensions. Shells can be also found in nature, so that in the context of bionics the construction can be oriented to examples in nature. In reinforced concrete construction the use of reinforced shells has been common for a long time. The construction of monolithical shells, however, needs a very high effort for rigging and formwork. This is the reason why concepts have been developed where shells are made out of modules which are then put together on the construction site. This concept of modules also offers the possibility to work with fractal structures. This idea is picked up and developed further in this project. The main focus of the research work lies in the supply of suitable numerical methods for the design and efficient static and dynamic simulation of such shell structures. This means to employ already existing substructure and model reduction techniques. These have to be adapted to the new field of use and have to be connected with non-linear finite element technologies. The main and in this existing research field so far unused advantage of the new combination of methods lies in the possibility to take into consideration the non-linear performance of the single modules with only very few (in the area of 3 to 5 inner) degrees-of-freedom per module. Redundant calculations for different elements of the same shape can be avoided. On the one hand optimal configurations of modules for different load combinations can be determined quickly. On the other hand the distinctive non-linear behavior of the (ultra high performance) concrete, also after the opening of the joints between the modules, can be taken into account. Due to the expected residual load bearing capacity the structures have high ductility. The concept mentioned here provides the composition of curved shell structures made of plane polygonal modules. The connecting zones between the modules shall be at right angle to their plane. In order to achieve the necessary angles for curved shells in the connection between two modules, joining parts are being used. These are being formed as semi-manufactured parts for different angles and are cut in length respective to the edges of the modules. The connection of the modules is achieved by centered unbonded prestressing . This joining technology allows the dismantling without destruction of the shells and therefore a further use of the elements. For the latter reason this form of construction can be used especially for temporal buildings. The already used parts can be used to build new shells with an entirely different shape.

壳结构特别适合建造轻型建筑物，因为它们可以建造成具有相对较薄的尺寸。贝壳也存在于自然界中，因此在仿生学的背景下，结构可以面向自然界中的例子。在钢筋混凝土建筑中，长期以来，钢筋壳的使用一直很常见。然而，整体外壳的建造需要付出很大的努力来进行索具和模板。这就是为什么开发了由模块制成外壳然后在施工现场组装在一起的概念的原因。这种模块概念还提供了使用分形结构的可能性。这个想法在这个项目中得到了进一步发展。研究工作的主要重点在于为此类壳结构的设计和有效的静态和动态模拟提供合适的数值方法。这意味着采用现有的子结构和模型简化技术。这些必须适应新的使用领域，并且必须与非线性有限元技术相结合。在这个现有的研究领域中，迄今为止未使用的新方法组合的主要优点在于可以考虑仅很少（在3到5内）度的单个模块的非线性性能每个模块的自由度。可以避免对相同形状的不同元素进行冗余计算。一方面，可以快速确定针对不同负载组合的模块的最佳配置。另一方面，可以考虑（超高性能）混凝土的独特非线性行为，以及在模块之间的接缝打开之后。由于预期的残余承载能力，该结构具有高延展性。这里提到的概念提供了由平面多边形模块组成的弯曲壳结构的组成。模块之间的连接区域应与其平面成直角。为了在两个模块之间的连接中实现弯曲壳体所需的角度，使用了连接部件。这些被形成为不同角度的半成品部件，并根据模块的边缘进行长度切割。模块的连接是通过中心无粘结预应力实现的。这种连接技术允许在不破坏外壳的情况下拆卸，从而进一步利用元件。由于后一个原因，这种结构形式尤其适用于临时建筑。已经使用过的零件可以用来建造形状完全不同的新外壳。