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Computational Design Methods for the Optimization of the Density Distribution in Graded Concrete Components under static and dynamic loading

静态和动态荷载下级配混凝土构件密度分布优化的计算设计方法

基本信息

批准号：
353348123
负责人：
Professor Dr.-Ing. Michael Herrmann
金额：
--
依托单位：
Department of Civil and Environmental Engineering
依托单位国家：
德国
项目类别：
Research Fellowships
财政年份：
2017
资助国家：
德国
起止时间：
2016-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/353348123?language=en
关键词：
Computational Design Methods Optimization Density

项目摘要

This research aims to develop a numerical design tool for determining the optimal density distribution within functionally graded structural concrete components subject to static and dynamic actions. This tool should be used to design functionally graded frame components for dynamic loading, which are then to be produced at ILEK and tested in Berkeley. Functionally graded structural components are characterized by location-dependent, continuous changes in their properties. Density gradation of concretes (i.e. a continuous change in the porosity within the component) serves to accurately adjust the properties of the material to the actions it is subjected to. High-impact zones are made from high-performance concrete whereas low-impact zones consist of porous concrete. This approach makes it possible to save up to 60% of the mass of the material, such as in floor structures subject to bending. Initial tests showed that this new lightweight construction method was associated with a high energy absorption capacity.Only after developing numerical design methods will it become possible to determine continuous, three-dimensional property gradation patterns. The optimization steps implemented in the preliminary research were limited on account of the simplified geometry, the linearly elastic material assumption, and the restriction to optimizing component rigidity. Methods were limited to the algorithms, design variables, and target functions provided in the commercially available optimization tool (Abaqus Atom). No alteration or adjustment of these parameters was possible. The design tool to be developed within the scope of the applied-for research grant should also enable thermal conductivity optimization whilst considering static restrictions and make it possible to design a density layout subject to dynamic actions. The design tool should then be made available free of charge to make a contribution to disseminating the new approach. Some of the optimization algorithms and simulation methods, such as the Concrete Damaged Plasticity Model to describe the non-linear material behavior of concrete, were developed at the University of California at Berkeley. Prof. Filippou has been conducting research on describing concrete structures subject to static and dynamic actions since 1983. The team of scientists tasked with the related activities and the existing infrastructure at the host university thus provide the perfect setting to successfully complete the envisaged research project. Once completed, this project will provide design methods to determine three-dimensional property gradations for structural concrete components subject to static, thermal, and dynamic actions. Besides the automation of manufacturing processes currently under development at ILEK, this design tool is the missing link to reliably produce structural concrete components with free, three-dimensional density gradation.

本研究旨在发展一个数值设计工具，以确定功能梯度结构混凝土构件在静态和动态作用下的最佳密度分布。该工具应用于设计动态载荷的功能梯度框架组件，然后在ILEK生产并在Berkeley进行测试。功能梯度结构部件的特征在于其性质的位置依赖性、连续变化。混凝土的密度分级（即构件内孔隙率的连续变化）用于根据材料所经受的作用准确地调整材料的性能。高冲击区由高性能混凝土制成，而低冲击区由多孔混凝土组成。这种方法可以节省高达60%的材料质量，例如在受弯曲的地板结构中。最初的测试表明，这种新的轻质结构方法具有很高的能量吸收能力。只有在开发了数值设计方法之后，才有可能确定连续的三维性能分级模式。由于简化的几何形状、线性弹性材料假设以及对优化部件刚度的限制，在初步研究中实施的优化步骤受到限制。方法仅限于商业优化工具（Abaqus Atom）中提供的算法、设计变量和目标函数。这些参数不可能改变或调整。在申请研究补助金的范围内开发的设计工具还应在考虑静态限制的同时实现热导率优化，并使设计受动态作用影响的密度布局成为可能。然后，应免费提供设计工具，为传播新方法作出贡献。一些优化算法和模拟方法，如混凝土损伤塑性模型来描述混凝土的非线性材料行为，是在加州大学伯克利分校开发的。Filippou教授自1983年以来一直从事描述静态和动态作用下混凝土结构的研究。因此，负责相关活动的科学家团队和东道大学的现有基础设施为成功完成设想的研究项目提供了完美的环境。一旦完成，该项目将提供设计方法，以确定结构混凝土构件受静态，热和动态作用的三维性能等级。除了ILEK目前正在开发的制造过程自动化之外，该设计工具是可靠生产具有自由三维密度等级的结构混凝土构件的缺失环节。