Tag Archive for: Finite Element

News & View, Volume 45 | Improved Asset Management Through Test Informed Analysis

News & Views, Volume 45 | Improved Asset Management Through Test Informed Analysis

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News & View, Volume 45 | Improved Asset Management Through Test Informed AnalysisBy:  Eri Kjolsing

Introduction
Structures may experience unforeseen operating environments or site-specific hazards leading to changes in the structure’s performance, safety, and longevity.  These changes often prompt asset owners to undertake analysis efforts to ensure satisfactory structural performance for the updated conditions. However, conventional analyses that fail to capture the true behavior of a structure can lead to inaccurate analysis results, causing owners to make less than ideal asset management decisions.  Structural Integrity (SI) is uniquely positioned to pair our dynamic characterization and advanced structural analysis capabilities to generate a better structural model.  SI vibration experts use impact testing, forced vibration, or ambient excitation sources, along with proprietary signal processing software, to non-destructively characterize the dynamic behavior of structural systems.  This characterization is used to inform advanced structural analyses by SI analysis experts to provide more accurate results related to operational improvements, damage location, and retrofits.

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News & View, Volume 43 | Perforation, Scabbing, and Reinforcement Optimization in an Aircraft Impact Analysis (AIA)

News & Views, Volume 43 | Perforation, Scabbing, and Reinforcement Optimization in an Aircraft Impact Analysis (AIA)

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By:  Eric Kjolsing

BackgroundNews & View, Volume 43 | Perforation, Scabbing, and Reinforcement Optimization in an Aircraft Impact Analysis (AIA)
A 2016 project utilized a variety of Structural Integrity competencies to analyze a beyond design basis threat at an overseas nuclear power plant.  The client was assessing a plant design and approached Structural Integrity to investigate local perforation and scabbing of a reinforced concrete wall due to hard missile impact.  Perforation occurs when a missile fully penetrates and passes through a target while scabbing occurs when material is ejected from the back face of a target, potentially striking personnel and equipment inside the facility.  The client also sought to reduce the volume of wall reinforcement, a potentially large cost savings, while still meeting the facility’s strict design criteria.  The project is best described in four stages and took advantage of our AIA experience, finite element (FE) modeling expertise, and proprietary concrete constitutive model ANACAP.

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