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290 results on '"Sas, Gabriel"'

1. Comparison and Joint Evaluation of Importance, Redundancy and Robustness Indicators Applied to Aging Prestressed Concrete Bridges

Author

Sarmiento Silvia, Thöns Sebastian, González-Libreros Jaime, Björnsson Ivar, and Sas Gabriel

Subjects
importance, redundancy, robustness, reliability, risk, Building construction, TH1-9745
Abstract

A bridge failure can result in significant social, economic, and environmental problems; therefore, its reliability and risk management are essential. Bridges’ system reliability and risks are governed mainly by their redundancy and robustness, which currently are not adequately included in most design code specifications. Thus, in this study, a comprehensive comparison between relevant importance, redundancy, and robustness indicators found in the literature with different levels of complexity is carried out. The indicators under analysis have been used separately in different studies but have never been addressed together. Therefore, this study presents a joint evaluation of deterministic, reliability- and risk-based indicators to evaluate the differences in interpretation and information provided by the indicators. The approach is exemplified by analyzing a prestressed concrete bridge subjected to continuous degradation due to chloride ingress. A procedure is implemented to couple a metamodel-based reliability approach with a Nonlinear Finite Element Analysis (NLFEA). Based on the analysis performed, the comparison between indicators showed how different interpretations can be obtained depending on the implemented approach. Thus, creating more uniform formulations and agreeing on target values is necessary to help with redundancy and robustness interpretation.

Published
2024
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7. Effects of Temperature and NaCl Concentration on the Adsorption of C-S-H Gel in Cement Paste: A Multi-fidelity Molecular Dynamics Simulation

Author

Cao, Jie, Wang, Chao, Wang, Tongfang, Gonzalez-Libreros, Jaime, Tu, Yongming, Sas, Gabriel, Elfgren, Lennart, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Ilki, Alper, editor, Çavunt, Derya, editor, and Çavunt, Yavuz Selim, editor

Published
2023
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8. Numerical Analysis of High-Speed Train Induced Aerodynamic Load on Noise Barrier Considering Wind Effect

Author

Liu, Dongyun, Wang, Chao, Gonzalez-Libreros, Jaime, Enoksson, Ola, Hojsten, Tommy, Tu, Yongming, Elfgren, Lennart, Sas, Gabriel, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Ilki, Alper, editor, Çavunt, Derya, editor, and Çavunt, Yavuz Selim, editor

Published
2023
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9. Numerical and Analytical Evaluation of Load Distribution Patterns on Ballasted Concrete Railway Bridges

Author

Eriksson, Alex, Ullrich, Anita, Wang, Chao, Gonzalez-Libreros, Jaime, Johansson, Johan, Enoksson, Ola, Quist, Johannes, Sas, Gabriel, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Ilki, Alper, editor, Çavunt, Derya, editor, and Çavunt, Yavuz Selim, editor

Published
2023
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10. Data Validation of Strain-Based Monitoring Systems in Low Temperature Conditions, Case Study: The Kalix Bridge

Author

Agredo Chávez, Angélica, Ulfberg, Adrian, Gonzalez-Libreros, Jaime, Elfgren, Lennart, Sas, Gabriel, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Ilki, Alper, editor, Çavunt, Derya, editor, and Çavunt, Yavuz Selim, editor

Published
2023
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11. Validation of an Experimental Methodology for Measuring Concrete Fracture Energy in Existing Structures

Author

Sarmiento, Silvia, González-Libreros, Jaime, Elfgren, Lennart, Andersson, Erik, Petersson, Mats, Sas, Gabriel, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Ilki, Alper, editor, Çavunt, Derya, editor, and Çavunt, Yavuz Selim, editor

Published
2023
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24. Metamodel-Based Reliability Assessment of Reinforced Concrete Beams Under Fatigue Loads

Author

Sarmiento Nova, Silvia J., Gonzalez-Libreros, Jaime, Sas, Gabriel, Elfgren, Lennart, Coric, Ibrahim, Enoksson, Ola, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Pellegrino, Carlo, editor, Faleschini, Flora, editor, Zanini, Mariano Angelo, editor, Matos, José C., editor, Casas, Joan R., editor, and Strauss, Alfred, editor

Published
2022
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49. Time–depth dependent chloride diffusion coefficient of self-compacting concrete.

Author

Liu, Dongyun, Wang, Chao, Guo, Tong, Gonzalez-Libreros, Jaime, Ge, Yuanfei, Tu, Yongming, Elfgren, Lennart, and Sas, Gabriel

Subjects
SELF-consolidating concrete, DIFFUSION coefficients, SOLUTION (Chemistry), CHLORIDE ions, REINFORCED concrete, CALCIUM chloride, SILICA fume
Abstract

Chloride attack severely impacts the performance of reinforced concrete. The total and free chloride ion concentration (CIC) of self-compacting concrete (SCC) prepared with three supplementary cementitious materials (SCM) – fly ash (FA), blast furnace slag (BS) and silica fume (SF) – were measured by accelerated salt immersion tests. The apparent chloride diffusion coefficient (CDC) at any exposure time and erosion depth were calculated using the Boltzmann–Matano method. The influence of the type and content of SCM, the water–binder ratio (W/B) and the type of salt solution on CIC and CDC were investigated. Both the introduction of SCM and the reduction of W/B effectively reduced the CIC. The SCM that most effectively reduced CIC was SF, followed by BS and then FA. Free CIC was reduced to a greater degree than total CIC in FA and BS concrete, but the opposite was true for SF concrete. The presence of calcium chloride in salt solution increased total CIC while reducing free CIC. Apparent free CDC dropped over exposure time and initially increased with erosion depth but eventually stabilised. A model of apparent free CDC considering time–depth dependency was created, which shows that time reduction factors of CDC is greater in SCC containing SCM than in control SCC. [ABSTRACT FROM AUTHOR]

Published
2024
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