OPERATIONAL METHODS FOR THE ASSESSMENT AND MANAGEMENT OF AGING INFRASTRUCTURE

The aims and scope of the Handbook is to provide designers with a general methodology for the assessment of existing structures, which is illustrated step by step, referring to the selected case studies. The case studies have been chosen not only in order to cover as much as possible the actual variety of infrastructures and materials, but also different building periods, from the sixteenth century to the most recent past. In this way, it is possible to consider structures designed according to different approaches; in fact, while recent structures have been designed according to Codes, Standards, Guidelines or theoretical models, the most ancient ones have been designed according to empirical rules or architectural canons, therefore the understanding of original design ideas often requires that survey and in-situ measurements and investigations are supplement with historical studies. In the presentation of case studies, beside the reference to the general procedures provided by modern Codes and ISO 13822 in particular, the above mentioned necessity of understanding original design ideas and the significance of the engineering judgement in the diagnosis of the structural decays are emphasized, aiming to communicate to the reader a correct way to approach existing structures. The references mentioned in each chapter provide additional background materials, further guidance and information, allowing to widen the significance and the field of application of the assessment methods illustrated for each case study

Physics and Process Modeling (PPM) and Other Propulsion R and T

This CP contains the extended abstracts and presentation figures of 36 papers presented at the PPM and Other Propulsion R&T Conference. The focus of the research described in these presentations is on materials and structures technologies that are parts of the various projects within the NASA Aeronautics Propulsion Systems Research and Technology Base Program. These projects include Physics and Process Modeling; Smart, Green Engine; Fast, Quiet Engine; High Temperature Engine Materials Program; and Hybrid Hyperspeed Propulsion. Also presented were research results from the Rotorcraft Systems Program and work supported by the NASA Lewis Director's Discretionary Fund. Authors from NASA Lewis Research Center, industry, and universities conducted research in the following areas: material processing, material characterization, modeling, life, applied life models, design techniques, vibration control, mechanical components, and tribology. Key issues, research accomplishments, and future directions are summarized in this publication

Bridges Structural Health Monitoring and Deterioration Detection Synthesis of Knowledge and Technology

INE/AUTC 10.0

Book of abstracts of the 14th International Symposium of Croatian Metallurgical Society - SHMD \u272020, Materials and metallurgy

Book of abstracts of the 14th International Symposium of Croatian Metallurgical Society - SHMD \u272020, Materials and metallurgy held in Šibenik, Croatia, June 21-26, 2020. Abstracts are organized in four sections: Materials - section A; Process metallurgy - Section B; Plastic processing - Section C and Metallurgy and related topics - Section D

Fibre reinforced concrete column-supported flat slabs : from material and structural characterization to design and economic optimization

Tesi en modalitat de compendi de publicacionsFibre reinforced concrete (FRC) has proven to be a suitable material for statically indeterminate elements. The FRC column-supported flat slabs with partial or even total substitution of reinforcing steel bars constructed within the scope of this thesis provided the positive outcomes from both technical and sustainability perspectives, being a supporting evidence for this statement. Despite the successful experiences of FRC slab construction, the widespread use of this technology is still hindered because of a number of factors related to the general comprehension of the material’s properties, design procedure, and accurate assessment of both technological and economic aspects. In this context, further research is required to complement the current scope of knowledge, providing to practitioners and researchers a clear example of structural capacity of FRC column-supported flat slabs. Moreover, straightforward procedures focused on the design and following evaluation of the potential technological and economic benefits due to use of FRC should be de-rived. Therefore, a rather comprehensive doctoral thesis that covers the majority of the above-mentioned topics is proposed herein. The first part of the study focuses on the material characterization and analysis of the flexural behavior of FRC column-supported flat slab. A full-scale FRC slab was constructed and tested under different load magnitudes, assessing the structural response at both ultimate and serviceability limit states. The results derived proved the sufficient flexural strength at ultimate conditions along with the capacity of moment redistribution and the ductility of the system. Furthermore, the studied FRC slab evidenced the acceptable performance in terms of cracking and deflections. Subsequently, the straightforward design-oriented method is proposed to estimate the structural response of FRC column-supported flat slabs in terms of flexural strength, cracking control, and instantaneous deformations. The results derived were compared with a nonlinear analysis, highlighting a suitable accuracy and precision of the proposed approach. Finally, an industrial-oriented study was carried out with the main objective of elaborating a simplified method for the preliminary comparison of traditional and FRC solutions for column-supported flat slabs in terms of economic benefits. The results reflected an increment of direct costs for both fibre and hybrid (fibre + reinforcing steel bars, HFRC) solutions; however, these increments can be compensated by the reduction of the construction period and, as a consequence, time-dependent costs (i.e. preliminaries, equipment costs, overheads, and finance costs).El hormigón reforzado con fibras (HRF) ha demostrado ser un material adecuado para elementos sujetos a condiciones de contorno que conducen a hiperestaticidad. La construcción de forjados de HRF soportados por pilares ha proporcionado resultados positivos tanto desde el punto de vista técnico como de la sostenibilidad. A pesar de las experiencias de éxito en la sustitución parcial o incluso total del refuerzo tradicional (barras de acero) por fibras, el uso de esta tecnología todavía sigue siendo limitada debido a una serie de factores relacionados con la compresión general de las propiedades de HRF, los métodos de diseño junto con el análisis de los aspectos tecnológicos y económicos. En este contexto, se hace necesario continuar investigando el comportamiento de las losas bidireccionales de HRF con el objeto de complementar el marco actual de conocimiento, proporcionando a los profesionales evidencias de la capacidad estructural de este tipo de elementos. Además, la industria requiere los métodos de diseño prácticos junto con herramientas para llevar a cabo el análisis comparativo de diferentes soluciones en términos de beneficios tecnológicos y económicos. Por este motivo, se plantea una tesis doctoral generalista que abarca la mayoría de los temas mencionados en el ámbito de la tecnología de los forjados de losa maciza de hormigón reforzado con fibras. La primera parte del estudio se enfoca en la caracterización del material y posterior análisis del comportamiento a flexión de un forjado de HRF soportado por pilares. Para ello, se ha construido y ensayado una losa a escala real bajo diferentes magnitudes de carga, evaluando la res-puesta estructural del elemento en estado límite de servicio y último. Los resultados obtenidos han mostrado la suficiente resistencia a flexión bajo las cargas últimas junto con una elevada ductilidad y capacidad de redistribuir los esfuerzos en el sistema hiperestático. Asimismo, la losa de HRF analizada ha cumplido con los requisitos del estado límite de fisuración y de deformaciones. Posteriormente, se propone un método de diseño analítico para estimar la respuesta estructural de las losas de HRF soportadas por pilares en términos de resistencia a flexión, control de fisuración y de deformaciones instantáneas. Los resultados derivados se compararon con un análisis no lineal mediante el método de los elementos finitos, destacando una precisión adecua-da desde el punto de vista ingenieril del método propuesto. En la última parte se presenta un método simplificado para llevar a cabo un análisis comparativo de soluciones tradicionales y de HRF para las losas apoyadas sobre pilares en términos eco-nómicos. Los resultados del estudio comparativo demostraron un incremento de los costes directos para las soluciones con fibra (sustitución parcial o total del refuerzo tradicional); sin embargo, este incremento de los costes puede compensarse debido a la reducción del periodo de construcción y, como consecuencia, reducción de los costes indirectos (costes de maquinaria y herramientas, gastos de administración y dirección técnica, costes financieros).Postprint (published version

Computational Modelling of Concrete and Concrete Structures

Computational Modelling of Concrete and Concrete Structures contains the contributions to the EURO-C 2022 conference (Vienna, Austria, 23-26 May 2022). The papers review and discuss research advancements and assess the applicability and robustness of methods and models for the analysis and design of concrete, fibre-reinforced and prestressed concrete structures, as well as masonry structures. Recent developments include methods of machine learning, novel discretisation methods, probabilistic models, and consideration of a growing number of micro-structural aspects in multi-scale and multi-physics settings. In addition, trends towards the material scale with new fibres and 3D printable concretes, and life-cycle oriented models for ageing and durability of existing and new concrete infrastructure are clearly visible. Overall computational robustness of numerical predictions and mathematical rigour have further increased, accompanied by careful model validation based on respective experimental programmes. The book will serve as an important reference for both academics and professionals, stimulating new research directions in the field of computational modelling of concrete and its application to the analysis of concrete structures. EURO-C 2022 is the eighth edition of the EURO-C conference series after Innsbruck 1994, Bad Gastein 1998, St. Johann im Pongau 2003, Mayrhofen 2006, Schladming 2010, St. Anton am Arlberg 2014, and Bad Hofgastein 2018. The overarching focus of the conferences is on computational methods and numerical models for the analysis of concrete and concrete structures