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

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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.