Nonlinear heterogeneous dynamic substructuring and partitioned FETI time integration for the development of low‐discrepancy simulation models
Nonlinear heterogeneous dynamic substructuring and partitioned FETI time integration for the development of low‐discrepancy simulation models
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DOI：
10.1002/nme.5556
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发表时间：
2017-11
影响因子：
2.9
通讯作者：
O. Bursi;G. Abbiati;E. Cazzador;P. Pegon;F. Molina
中科院分区：
文献类型：
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作者：
O. Bursi;G. Abbiati;E. Cazzador;P. Pegon;F. Molina
本文提出了一种新的方法，模型验证和复杂结构系统的校准，通过采用异构（数值/物理）模拟的基础上动态子结构（HDS）。HDS将包含感兴趣的非线性行为的关键区域的物理子系统（PS）与系统的其余部分（即数值模拟的数值子系统（NS））分离，并进行实验测试。基于有限元撕裂和互连方法的并行分区时间积分器在求解耦合系统响应中起着核心作用，能够实现子系统之间严格稳定的同步以及PS和数值子系统响应之间的真实交互。此功能通过虚拟结构测试提高了用于验证和校准低差异模型的基准的质量。作为一个概念的证明，我们选择了一个旧的钢筋混凝土高架桥，受到地震荷载。在位于伊斯普拉（意大利）的欧洲结构评估实验室进行了几次HDS试验，将两个物理桥墩和相关的凹形滑动支座视为异质系统的PS。因此，通过开发关键高架桥构件的低差异有限元模型，突出了采用HDS为模型验证和校准设定基准的好处。版权所有© 2017约翰威利父子有限公司
This article presents a novel approach to model validation and to the calibration of complex structural systems, through the adoption of heterogeneous (numerical/physical) simulation based on dynamic substructuring (HDS). HDS isolates the physical sub‐system (PS) that contains the key region of nonlinear behavior of interest and is tested experimentally, separate from the remainder of the system, that is, the numerical sub‐system (NS), which is numerically simulated. A parallel partitioned time integrator based on the finite element tearing and interconnecting method plays a central role in solving the coupled system response, enabling a rigorous and stable synchronization between sub‐systems and a realistic interaction between PS and numerical sub‐system response. This feature enhances the quality of benchmarks for validation and calibration of low‐discrepancy models through virtual structural testing. As a proof of concept, we select an old reinforced concrete viaduct, subjected to seismic loading. Several HDS were conducted at the European Laboratory for Structural Assessment in Ispra (Italy) considering two physical piers and related concave sliding bearings as PSs of the heterogeneous system. As a result, the benefit of employing HDS to set benchmarks for model validation and calibration is highlighted, by developing low‐discrepancy FE models of critical viaduct components. Copyright © 2017 John Wiley & Sons, Ltd.