Damage identification using inverse analysis for 3D coupled thermo-hydro-mechanical problems
Damage identification using inverse analysis for 3D coupled thermo-hydro-mechanical problems
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DOI：
10.1016/j.compstruc.2017.11.008
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发表时间：
2018-02
影响因子：
4.7
通讯作者：
L. Nguyen-Tuan;C. Könke;T. Lahmer
中科院分区：
文献类型：
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作者：
L. Nguyen-Tuan;C. Könke;T. Lahmer
在本文中，通过基于瞬态位移、温度和水压等一系列测量的基于多场的反演分析来确定大型砌体结构的损坏位置和程度。由于这是典型的多场问题，损伤的存在会导致不同物理场参数的局部变化。损坏的程度由一个主要变量定义，并从中导出其他量。对于非等温边界条件下可变形多孔介质中的流体流动问题，这个量就是材料的孔隙率。逆分析基于全局搜索方法，采用双层并行计算来降低计算成本。本文还讨论了测量不确定性和损伤大小对解决方案准确性的影响。
In this paper, location and degree of damages in massive masonry structures are identified by a multi-field based inverse analysis which relies on a series of measurements such as transient displacements, temperatures and water pressures. As it is typical for the multi-field problems, the existence of damage leads to local changes in parameters of the different physical fields. The degree of the damage is defined by one primary variable, from which other quantities are derived. For fluid-flow problems in deformable porous media under non-isothermal boundary conditions such a quantity is the porosity of the material. The inverse analysis bases on a global search method, in which a dual-level parallel-computation is applied to improve computational cost. The effects of uncertainties in measurements and the size of the damage on the accuracy of the solutions are also discussed in the paper.