Nonlinear Optimization of Geometrical Defined Joints for Spatial Curved Precast Concrete Components Considering Different Load Cases and the Influence of Material and Structural Behavior Aspects using Isogeometric Techniques

考虑不同荷载情况以及使用等几何技术的材料和结构行为方面的影响，对空间弯曲预制混凝土构件的几何定义接头进行非线性优化

• 批准号: 198016927
• 负责人: Professor Dr.-Ing. Kai-Uwe Bletzinger
• 金额: --
• 依托单位: Lehrstuhl für Statik
• 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/198016927?language=en
• 关键词: Nonlinear; Optimization; Geometrical; Defined; Joints

The vision of this renewal proposal is the shell, composed out of spatial curved, thin-walled precast concrete components, made of steel fiber reinforced concreteThe goal of this project is the further development of the methods, developed in the ongoing project, used for the design, analysis and joint optimization of segmented shells, such that, they can be used for practical applications.With the conclusion of this project a continuous process from the design to the determination of the formwork geometries of the precast concrete components could be provided. The focus of this project is the determination of the optimal joint pattern for shells, made of precast concrete components. In this project the currently used technique for the determination of joint patterns, developed in the ongoing project, should be extended by considering additionally practical aspects, like geometrical nonlinearities (stability) for different load cases and the mechanical modeling of joints. These aspects can have large influence on the structural behavior of shells. Thus for practical applications these aspects must be considered for the analysis and joint optimization. Hereby the joints should be modeled as curved spring models (relative rotations and displacements springs).For this project the Isogeometric B-Rep Analysis (IBRA) concept will be used. IBRA was developed in the ongoing project. It simplifies besides the joint optimization the entire design and analysis process. IBRA uses for the approximation of the solution just Computer-Aided-Design (CAD) parameters and thus it is an extension of the isogeometric analysis (IGA) concept. IBRA uses in addition to the same basis functions, also the same boundary representation and topology of the CAD model. Thus, the geometrical models for the design, analysis and optimization can be combined in one model. IBRA is well suited for free-form shapes, such as "Blobs" and hanging shapes.

这一更新方案的设想是由空间弯曲的薄壁预制混凝土构件组成的钢纤维混凝土壳体。该项目的目标是进一步发展正在进行的项目中开发的用于分段壳体的设计、分析和节点优化的方法，以便它们可以用于实际应用。随着该项目的结束，可以提供从设计到确定预制混凝土构件的模板几何形状的连续过程。该项目的重点是确定由预制混凝土组件制成的壳体的最佳接缝模式。在本项目中，当前使用的确定节点模式的技术应扩展到其他实用方面，如不同荷载情况下的几何非线性(稳定性)和节点的力学建模。这些方面可能会对壳的结构行为产生很大影响。因此，在实际应用中，必须综合考虑这些方面进行分析和联合优化。因此，应将接头建模为曲线弹簧模型(相对旋转和位移弹簧)。对于本项目，将使用等距B-Rep分析(IBRA)的概念。IBRA是在正在进行的项目中开发的。它除了简化了节点优化外，还简化了整个设计分析过程。IBRA仅使用计算机辅助设计(CAD)参数来近似求解，因此它是等距几何分析(IGA)概念的扩展。IBRA除了使用相同的基函数外，还使用与CAD模型相同的边界表示和拓扑。因此，用于设计、分析和优化的几何模型可以组合在一个模型中。Ibra非常适合自由形式的形状，如“水滴”和悬挂形状。