Download or read book Seismic Reliability Assessment of Structures Incorporating Modeling Uncertainty and Implications for Seismic Collapse Safety written by Beliz Ugurhan Gokkaya and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Advancements in nonlinear dynamic simulation, seismic hazard analysis, and performance-based earthquake engineering are enabling more scientific assessment of structural collapse risk and how the risk is controlled by building code design requirements. Although current collapse assessment methods carefully account for the nonlinear response of structures, most of these analyses do not explicitly capture model uncertainties associated with variability in the structural properties and response characteristics of components. Instead, modeling uncertainties are typically considered through simplified assumptions and techniques. This dissertation focuses on modeling uncertainty in seismic performance assessment and implications on seismic collapse safety of structures. A statistical framework assessing model parameter correlations from component tests is proposed for characterizing the modeling parameters that define dynamic response at a component level and the interactions of multiple uncertain components in structural systems. The framework is illustrated using a dataset that is composed of over two-hundred tests of reinforced concrete columns. Statistics of the model parameters are established including the correlation structure of the inelastic model parameters, both within a component and between different components. The analyses show that model parameters within structural components tend to be only mildly correlated, whereas there are strong correlations between like parameters of different components within a building. Uncertainty propagation methods, including Monte-Carlo simulation-based, moment-based and surrogate (response surface and neural network) methods, are assessed for probabilistic assessment of collapse risk. To reduce computational demand of collapse risk assessment, a Bayesian approach is proposed and demonstrated using a reinforced concrete archetype building. The results emphasize the sensitivity of collapse response to modeling uncertainties and the challenges of balancing of computational efficiency and robust uncertainty characterization. Impacts of modeling uncertainty are evaluated for fragility functions and mean annual exceedance rates for drift limits and collapse for thirty-three reinforced concrete archetype building configurations. Modeling uncertainty is shown to have considerable impacts on collapse risk. Inclusion of modeling uncertainty is shown to increase the mean annual frequency of collapse by about 1.7 times, as compared to analyses based on median model parameters, for a high-seismic site in California. Modeling uncertainty has a smaller effect on drift demands at levels usually considered in building codes. A novel method is introduced to relate drift demands to collapse safety through a joint distribution of deformation demand and capacity, taking into account simulated instances of collapse and no-collapse. This method enables linking seismic performance goals specified in building codes to drift limits and other acceptance criteria. The distributions of drift demand at maximum considered earthquake level and drift capacity of case study structures are compared with drift limits as specified in the proposed seismic criteria for the next edition (2016) of ASCE 7.

Download or read book Reliability Based Analysis and Design of Structures and Infrastructure written by Ehsan Noroozinejad Farsangi and published by CRC Press. This book was released on 2021-09-27 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt: Increasing demand on improving the resiliency of modern structures and infrastructure requires ever more critical and complex designs. Therefore, the need for accurate and efficient approaches to assess uncertainties in loads, geometry, material properties, manufacturing processes, and operational environments has increased significantly. Reliability-based techniques help develop more accurate initial guidance for robust design and help to identify the sources of significant uncertainty in structural systems. Reliability-Based Analysis and Design of Structures and Infrastructure presents an overview of the methods of classical reliability analysis and design most associated with structural reliability. It also introduces more modern methods and advancements, and emphasizes the most useful methods and techniques used in reliability and risk studies, while elaborating their practical applications and limitations rather than detailed derivations. Features: Provides a practical and comprehensive overview of reliability and risk analysis and design techniques. Introduces resilient and smart structures/infrastructure that will lead to more reliable and sustainable societies. Considers loss elimination, risk management and life-cycle asset management as related to infrastructure projects. Introduces probability theory, statistical methods, and reliability analysis methods. Reliability-Based Analysis and Design of Structures and Infrastructure is suitable for researchers and practicing engineers, as well as upper-level students taking related courses in structural reliability analysis and design.

Download or read book Reliability Based Analysis and Design of Structures and Infrastructure written by Ehsan Noroozinejad Farsangi and published by CRC Press. This book was released on 2021-09-27 with total page 597 pages. Available in PDF, EPUB and Kindle. Book excerpt: Increasing demand on improving the resiliency of modern structures and infrastructure requires ever more critical and complex designs. Therefore, the need for accurate and efficient approaches to assess uncertainties in loads, geometry, material properties, manufacturing processes, and operational environments has increased significantly. Reliability-based techniques help develop more accurate initial guidance for robust design and help to identify the sources of significant uncertainty in structural systems. Reliability-Based Analysis and Design of Structures and Infrastructure presents an overview of the methods of classical reliability analysis and design most associated with structural reliability. It also introduces more modern methods and advancements, and emphasizes the most useful methods and techniques used in reliability and risk studies, while elaborating their practical applications and limitations rather than detailed derivations. Features: Provides a practical and comprehensive overview of reliability and risk analysis and design techniques. Introduces resilient and smart structures/infrastructure that will lead to more reliable and sustainable societies. Considers loss elimination, risk management and life-cycle asset management as related to infrastructure projects. Introduces probability theory, statistical methods, and reliability analysis methods. Reliability-Based Analysis and Design of Structures and Infrastructure is suitable for researchers and practicing engineers, as well as upper-level students taking related courses in structural reliability analysis and design.

Download or read book Safety Reliability Risk and Life Cycle Performance of Structures and Infrastructures written by George Deodatis and published by CRC Press. This book was released on 2014-02-10 with total page 1112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Safety, Reliability, Risk and Life-Cycle Performance of Structures and Infrastructures contains the plenary lectures and papers presented at the 11th International Conference on STRUCTURAL SAFETY AND RELIABILITY (ICOSSAR2013, New York, NY, USA, 16-20 June 2013), and covers major aspects of safety, reliability, risk and life-cycle performance of str

Download or read book Performance based Earthquake Engineering with the First order Reliability Method written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Performance-based earthquake engineering is an emerging field of study that complements the prescriptive methods that the design codes provide to ensure adequate seismic performance of structures. Accounting for uncertainties in the performance assessments forms an important component in this area. In this context, the present study focuses on two broad themes; first, treatment of uncertainties and the application of the first-order reliability method (FORM) in finite-element reliability analysis, and second, the seismic risk assessment of reinforced concrete structures for performance states such as, collapse and monetary loss. In the first area, the uncertainties arising from inherent randomness ("aleatory uncertainty") and due to the lack of knowledge ("epistemic uncertainty") are identified. A framework for the separation of these uncertainties is proposed. Following this, the applicability of FORM to the linear and nonlinear finite-element structural models under static and dynamic loading is investigated. The case studies indicate that FORM is applicable for linear and nonlinear static problems. Strategies are proposed to circumvent and remedy potential challenges to FORM. In the case of dynamic problems, the application of FORM is studied with an emphasis on cumulative response measures. The limit-state surface is shown to have a closed and nonlinear geometric shape. Solution methods are proposed to obtain probability bounds based on the FORM results. In the application-oriented second area of research, at first, the probability of collapse of a reinforced concrete frame is assessed with nonlinear static analysis. By modelling the post-failure behaviour of individual structural members, the global response of the structure is estimated beyond the component failures. The final application is the probabilistic assessment of monetary loss for a high-rise shear wall building due to the seismic hazard in the Cascadia subduction zone. A 3-dimensional finite-element.

Download or read book Structural Seismic Design Optimization and Earthquake Engineering Formulations and Applications written by Plevris, Vagelis and published by IGI Global. This book was released on 2012-05-31 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Throughout the past few years, there has been extensive research done on structural design in terms of optimization methods or problem formulation. But, much of this attention has been on the linear elastic structural behavior, under static loading condition. Such a focus has left researchers scratching their heads as it has led to vulnerable structural configurations. What researchers have left out of the equation is the element of seismic loading. It is essential for researchers to take this into account in order to develop earthquake resistant real-world structures. Structural Seismic Design Optimization and Earthquake Engineering: Formulations and Applications focuses on the research around earthquake engineering, in particular, the field of implementation of optimization algorithms in earthquake engineering problems. Topics discussed within this book include, but are not limited to, simulation issues for the accurate prediction of the seismic response of structures, design optimization procedures, soft computing applications, and other important advancements in seismic analysis and design where optimization algorithms can be implemented. Readers will discover that this book provides relevant theoretical frameworks in order to enhance their learning on earthquake engineering as it deals with the latest research findings and their practical implementations, as well as new formulations and solutions.

Download or read book Safety and Reliability of Complex Engineered Systems written by Luca Podofillini and published by CRC Press. This book was released on 2015-09-03 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt: Safety and Reliability of Complex Engineered Systems contains the Proceedings of the 25th European Safety and Reliability Conference, ESREL 2015, held 7-10 September 2015 in Zurich, Switzerland. It includes about 570 papers accepted for presentation at the conference. These contributions focus on theories and methods in the area of risk, safety and

Download or read book Hydro Environmental Analysis written by James L. Martin and published by CRC Press. This book was released on 2013-12-04 with total page 5742 pages. Available in PDF, EPUB and Kindle. Book excerpt: Focusing on fundamental principles, Hydro-Environmental Analysis: Freshwater Environments presents in-depth information about freshwater environments and how they are influenced by regulation. It provides a holistic approach, exploring the factors that impact water quality and quantity, and the regulations, policy and management methods that are necessary to maintain this vital resource. It offers a historical viewpoint as well as an overview and foundation of the physical, chemical, and biological characteristics affecting the management of freshwater environments. The book concentrates on broad and general concepts, providing an interdisciplinary foundation. The author covers the methods of measurement and classification; chemical, physical, and biological characteristics; indicators of ecological health; and management and restoration. He also considers common indicators of environmental health; characteristics and operations of regulatory control structures; applicable laws and regulations; and restoration methods. The text delves into rivers and streams in the first half and lakes and reservoirs in the second half. Each section centers on the characteristics of those systems and methods of classification, and then moves on to discuss the physical, chemical, and biological characteristics of each. In the section on lakes and reservoirs, it examines the characteristics and operations of regulatory structures, and presents the methods commonly used to assess the environmental health or integrity of these water bodies. It also introduces considerations for restoration, and presents two unique aquatic environments: wetlands and reservoir tailwaters. Written from an engineering perspective, the book is an ideal introduction to the aquatic and limnological sciences for students of environmental science, as well as students of environmental engineering. It also serves as a reference for engineers and scientists involved in the management, regulation, or restoration of freshwater environments.

Download or read book Seismic Hazard and Risk Analysis written by Jack Baker and published by Cambridge University Press. This book was released on 2021-10-21 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seismic hazard and risk analyses underpin the loadings prescribed by engineering design codes, the decisions by asset owners to retrofit structures, the pricing of insurance policies, and many other activities. This is a comprehensive overview of the principles and procedures behind seismic hazard and risk analysis. It enables readers to understand best practises and future research directions. Early chapters cover the essential elements and concepts of seismic hazard and risk analysis, while later chapters shift focus to more advanced topics. Each chapter includes worked examples and problem sets for which full solutions are provided online. Appendices provide relevant background in probability and statistics. Computer codes are also available online to help replicate specific calculations and demonstrate the implementation of various methods. This is a valuable reference for upper level students and practitioners in civil engineering, and earth scientists interested in engineering seismology.

Download or read book Performance based Seismic Design of Nonlinear Steel Structures Using a Novel Reliability Technique written by Jose Ramon Gaxiola Camacho and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A unified performance-based seismic design procedure is proposed and successfully implemented in this dissertation. It provides an alternative to the currently used life safety design requirement. To successfully develop the concept, structures are represented by finite elements and excited by the seismic loading in time domain. To implement the performance-based seismic design concept, a novel reliability evaluation technique is proposed, integrating the finite element method, first order reliability method, the response surface method, and advanced factorial design concept, producing compounding beneficial effects. Following the 1994 Northridge earthquake, several improved connections in steel buildings were proposed to eliminate brittle fractures in welds. Making connections more flexible was considered to be an attractive option. One type of flexible connection considered in this study is expected to be economical and improve the behavior of steel structures, making them more seismic load-tolerant. However, the partial rigidities of connections need to be considered. To consider rigidities of connections, the 4-parameters Richard model is incorporated in the finite element algorithm. The accuracy of the procedure is demonstrated by comparing it with respect to Monte Carlo Simulation. The efficiency and robustness are verified with the help of several steel structures of different height. Performances are defined in terms of immediate occupancy, life safety, and collapse prevention. The corresponding risks are evaluated by exciting steel structures designed by experts satisfying all post-Northridge seismic design requirements. In order to incorporate uncertainties in frequency contents of ground motions, the structures are excited by 20 earthquake time histories for each performance level, and the corresponding reliability indexes and probabilities of failure are estimated. Only hundreds of deterministic finite element analysis are required for extracting the corresponding risk. The superiority in extracting reliability information is demonstrated with respect to Monte Carlo Simulation, which requires thousands or millions of deterministic finite element analysis. The study confirms the benefits of multiple deterministic analyses suggested in recent design guidelines. The behavior of post-Northridge design is demonstrated to be superior to that of the pre-Northridge design, as expected. The performance criteria suggested by the Federal Emergency Management Agency appear to be reasonable and are expected to satisfy the intent of the performance-based design concept. Several other advantages of the novel reliability technique are presented in terms of corresponding risk of steel structures excited by simulated ground motions. A broadband platform developed by the Southern California Earthquake Center is used for the artificial generation of time histories. Then, the structural risk is calculated using simulated ground motions. Designing a structure using multiple time histories, as suggested in recent design guidelines, is a step in the right direction. Based on the results and the observations documented in this dissertation, a robust, efficient, and accurate reliability technique is proposed, and its implementation potential for the performance-based seismic design of steel structures is demonstrated.

Download or read book Engineering Geology and the Environment written by G.C. Koukis and published by CRC Press. This book was released on 1997-01-01 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composed of the proceedings of a symposium on engineering geology and the environment, held in Athens in June, 1997, this work provides a survey of trends in engineering geology, and an interdisciplinary collaboration with hydrogeology, geochemistry, geomorphology, and soil and rock mechanics.

Download or read book Structural Uncertainty in Seismic Risk Analysis written by T. K. Hasselman and published by . This book was released on 1980 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Probabilistic Models written by Pijush Samui and published by Butterworth-Heinemann. This book was released on 2019-10-05 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Probabilistic Models carefully examines the application of advanced probabilistic models in conventional engineering fields. In this comprehensive handbook, practitioners, researchers and scientists will find detailed explanations of technical concepts, applications of the proposed methods, and the respective scientific approaches needed to solve the problem. This book provides an interdisciplinary approach that creates advanced probabilistic models for engineering fields, ranging from conventional fields of mechanical engineering and civil engineering, to electronics, electrical, earth sciences, climate, agriculture, water resource, mathematical sciences and computer sciences. Specific topics covered include minimax probability machine regression, stochastic finite element method, relevance vector machine, logistic regression, Monte Carlo simulations, random matrix, Gaussian process regression, Kalman filter, stochastic optimization, maximum likelihood, Bayesian inference, Bayesian update, kriging, copula-statistical models, and more. - Explains the application of advanced probabilistic models encompassing multidisciplinary research - Applies probabilistic modeling to emerging areas in engineering - Provides an interdisciplinary approach to probabilistic models and their applications, thus solving a wide range of practical problems

Download or read book Multi hazard Approaches to Civil Infrastructure Engineering written by Paolo Gardoni and published by Springer. This book was released on 2016-06-22 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection focuses on the development of novel approaches to address one of the most pressing challenges of civil engineering, namely the mitigation of natural hazards. Numerous engineering books to date have focused on, and illustrate considerable progress toward, mitigation of individual hazards (earthquakes, wind, and so forth.). The current volume addresses concerns related to overall safety, sustainability and resilience of the built environment when subject to multiple hazards: natural disaster events that are concurrent and either correlated (e.g., wind and surge); uncorrelated (e.g., earthquake and flood); cascading (e.g., fire following earthquake); or uncorrelated and occurring at different times (e.g., wind and earthquake). The authors examine a range of specific topics including methodologies for vulnerability assessment of structures, new techniques to reduce the system demands through control systems; instrumentation, monitoring and condition assessment of structures and foundations; new techniques for repairing structures that have suffered damage during past events, or for structures that have been found in need of strengthening; development of new design provisions that consider multiple hazards, as well as questions from law and the humanities relevant to the management of natural and human-made hazards.

Download or read book Seismic reliability analysis of structures written by Paolo E. Pinto and published by Multimedia Cardano. This book was released on 2004 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Seismic Collapse Risk Assessment of Buildings written by Laura Eads and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Life safety and collapse prevention have always been primary goals of earthquake engineering. Although the collapse risk of structures has not been explicitly quantified until recently, interest in doing so has risen significantly. A primary reason for this is the advent of performance-based earthquake engineering, which considers uncertainties in the seismic hazard and structural response and seeks to engineer structures that will achieve a desired level of performance in terms of expected monetary losses, downtime and casualties. Collapse risk assessment of a structure involves combining information about the seismic hazard at the site with the behavior of the structure. Typically an intensity measure (IM) is used to describe the level of ground motion shaking and quantify the seismic hazard. The behavior of the structure is then characterized through nonlinear response history analysis by subjecting the structure to many different ground motions at various intensity levels. A collapse fragility curve, which describes how the probability of collapse increases as a function of the ground motion intensity, is constructed based on analysis results and combined with the seismic hazard curve to compute the mean annual frequency of collapse. This dissertation focuses on evaluating the effects of IM selection and computational approach on the computed collapse risk, and contributions are made in the following areas: (1) quantifying the uncertainty in the collapse risk estimate due to the number of ground motions used in structural analysis; (2) characterizing the ability of different IMs to efficiently predict structural collapse and provide reliable estimates of the collapse risk; (3) explaining why certain IMs perform better than others with respect to the previous point; and (4) because the spectral acceleration averaged over a period range has been identified as a promising IM for collapse risk assessment, providing recommendations on the period ranges that maximize the efficiency of this IM as a function of structural properties.

Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1977 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt: