Download or read book Seismic Protection of Bridge Structures Using Shape Memory Alloy based Isolation Systems Against Near field Earthquakes written by Osman Eser Ozbulut and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The damaging effects of strong ground motions on highway bridges have revealed the limitations of conventional design methods and emphasized the need for innovative design concepts. Although seismic isolation systems have been proven to be an effective method of improving the response of bridges during earthquakes, the performance of base-isolated structures during near-field earthquakes has been questioned in recent years. Near-field earthquakes are characterized by long period and large- velocity pulses. They amplify seismic response of the isolation system since the period of these pulses usually coincides with the period of the isolated structures. This study explores the feasibility and effectiveness of shape memory alloy (SMA)-based isolation systems in order to mitigate the response of bridge structures against near-field ground motions. SMAs have several unique properties that can be exploited in seismic control applications. In this work, uniaxial tensile tests are conducted first to evaluate the degree to which the behavior of SMAs is affected by variations in loading rate and temperature. Then, a neuro-fuzzy model is developed to simulate the superelastic behavior of SMAs. The model is capable of capturing rate- and temperature-dependent material response while it remains simple enough to carry out numerical simulations. Next, parametric studies are conducted to investigate the effectiveness of two SMA-based isolation systems, namely superelastic-friction base isolator (S-FBI) system and SMA/rubber-based (SRB) isolation system. The S-FBI system combines superelastic SMAs with a flat steel-Teflon bearing, whereas the SRB isolation system combines SMAs with a laminated rubber bearing rather than a sliding bearing. Upon evaluating the optimum design parameters for both SMA-based isolation systems, nonlinear time history analyzes with energy balance assessment are conducted to compare their performances. The results show that the S-FBI system has more favorable properties than the SRB isolation system. Next, the performance of the S-FBI systems is compared with that of traditional isolation systems used in practice. In addition, the effect of outside temperature on the seismic response of the S-FBI system is assessed. It is revealed that the S-FBI system can successfully reduce the response of bridges against near-field earthquakes and has excellent re-centering ability.

Download or read book Technologies for Sustainable Development written by Alka Mahajan and published by CRC Press. This book was released on 2020-09-01 with total page 423 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains a selection of papers presented at the 7th Nirma University International Conference on Engineering ‘NUiCONE 2019’. This conference followed the successful organization of four national conferences and six international conferences in previous years. The main theme of the conference was “Technologies for Sustainable Development”, which is in line with the “SUSTAINABLE DEVELOPMENT GOAL” established by the United Nations. The conference was organized with many inter-disciplinary technical themes encompassing a broad range of disciplines and enabling researchers, academicians and practitioners to choose between ideas and themes. Besides, NUiCONE-2019 has also presented an exciting new set of events to engage practicing engineers, technologists and technopreneurs from industry through special knowledge sharing sessions involving applied technical papers based on case-study applications, white-papers, panel discussions, innovations and technology products. This proceedings will definitely provide a platform to proliferate new findings among researchers. Advances in Transportation Engineering Emerging Trends in Water Resources and Environmental Engineering Construction Technology and Management Concrete and Structural Engineering Futuristic Power System Control of Power Electronics Converters, Drives and E-mobility Advanced Electrical Machines and Smart Apparatus Chemical Process Development and Design Technologies and Green Environment Sustainable Manufacturing Processes Design and Analysis of Machine and Mechanism Energy Conservation and Management Advances in Networking Technologies Machine Intelligence / Computational Intelligence Autonomic Computing Control and Automation Electronic Communications Electronics Circuits and System Design Signal Processing

Download or read book Response Control and Seismic Isolation of Buildings written by Masahiko Higashino and published by Routledge. This book was released on 2006-09-27 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: This state of the art report from an international task group (TG44) of CIB, the International Council of Building Research Organizations, presents a highly authoritative guide to the application of innovative technologies on response control and seismic isolation of buildings to practice worldwide. Many countries and cities are located in earthquake-prone areas making effective seismic design a major issue in structural engineering. Reassuringly, structural response control and seismic isolation have advanced remarkably in recent years following numerous studies internationally. Several major conferences have been held and reports have been written but little has been issued on the application of the technologies to good structural engineering practice. Plugging that gap, Response Control and Seismic Isolation of Buildings presents researchers in structural engineering (dynamics) and construction management with up-to-date applications of the latest technologies.

Download or read book Experimental Vibration Analysis for Civil Structures written by Jian Zhang and published by CRC Press. This book was released on 2020-11-04 with total page 745 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental Vibration Analysis for Civil Structures: Testing, Sensing, Monitoring, and Control covers a wide range of topics in the areas of vibration testing, instrumentation, and analysis of civil engineering and critical infrastructure. It explains how recent research, development, and applications in experimental vibration analysis of civil engineering structures have progressed significantly due to advancements in the fields of sensor and testing technologies, instrumentation, data acquisition systems, computer technology, computational modeling and simulation of large and complex civil infrastructure systems. The book also examines how cutting-edge artificial intelligence and data analytics can be applied to infrastructure systems. Features: Explains how recent technological developments have resulted in addressing the challenge of designing more resilient infrastructure Examines numerous research studies conducted by leading scholars in the field of infrastructure systems and civil engineering Presents the most emergent fields of civil engineering design, such as data analytics and Artificial Intelligence for the analysis and performance assessment of infrastructure systems and their resilience Emphasizes the importance of an interdisciplinary approach to develop the modeling, analysis, and experimental tools for designing more resilient and intelligent infrastructures Appropriate for practicing engineers and upper-level students, Experimental Vibration Analysis for Civil Structures: Testing, Sensing, Monitoring, and Control serves as a strategic roadmap for further research in the field of vibration testing and instrumentation of infrastructure systems.

Download or read book Mechanics of Rubber Bearings for Seismic and Vibration Isolation written by James M. Kelly and published by John Wiley & Sons. This book was released on 2011-08-24 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: Widely used in civil, mechanical and automotive engineering since the early 1980s, multilayer rubber bearings have been used as seismic isolation devices for buildings in highly seismic areas in many countries. Their appeal in these applications comes from their ability to provide a component with high stiffness in one direction with high flexibility in one or more orthogonal directions. This combination of vertical stiffness with horizontal flexibility, achieved by reinforcing the rubber by thin steel shims perpendicular to the vertical load, enables them to be used as seismic and vibration isolators for machinery, buildings and bridges. Mechanics of Rubber Bearings for Seismic and Vibration Isolation collates the most important information on the mechanics of multilayer rubber bearings. It explores a unique and comprehensive combination of relevant topics, covering all prerequisite fundamental theory and providing a number of closed-form solutions to various boundary value problems as well as a comprehensive historical overview on the use of isolation. Many of the results presented in the book are new and are essential for a proper understanding of the behavior of these bearings and for the design and analysis of vibration or seismic isolation systems. The advantages afforded by adopting these natural rubber systems is clearly explained to designers and users of this technology, bringing into focus the design and specification of bearings for buildings, bridges and industrial structures. This comprehensive book: includes state of the art, as yet unpublished research along with all required fundamental concepts; is authored by world-leading experts with over 40 years of combined experience on seismic isolation and the behavior of multilayer rubber bearings; is accompanied by a website at www.wiley.com/go/kelly The concise approach of Mechanics of Rubber Bearings for Seismic and Vibration Isolation forms an invaluable resource for graduate students and researchers/practitioners in structural and mechanical engineering departments, in particular those working in seismic and vibration isolation.

Download or read book Effect of Isolators on Regular Bridges Subjected to Scaled Near Field and Far Field Time Histories written by Tejaswi L. Kuppa and published by . This book was released on 2014 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seismic isolation is an important and widely used method to protect a structure from the devastating effects of earthquake ground motions. Seismic isolation seeks to mitigate the effects of the ground motions by decreasing the base shear acting on the structure by increasing the fundamental time period of the structure in question. This in turn affects the spectral acceleration and hence the base shear. This thesis deals with investigating the behavior of lead core rubber isolators, on bridges, under near field and far field earthquake loading. The earthquake records were scaled to three intensities, namely, very high, high, and medium to high. The parameters investigated were the longitudinal base shear, transverse base shear, longitudinal displacement and transverse displacement caused by a wide range of scaled earthquake load intensities. SAP 2000 was used to run the analysis on different bridge models which varied in the number of spans, length of span and the height of the columns. The lead core rubber isolators used in the models varied in the longitudinal and transverse stiffness. The isolator stiffness ranged from 90 kips per feet to 270 kips per feet. The results showed that the isolators reduced the longitudinal base shear for most cases. With the use of isolators there was also an increase in displacements. The results in the transverse direction showed variability which was caused by not smoothing out the response curves for the ground motions in the transverse direction. The results also show that care has to be taken when using isolation for bridges in locations with very high intensity earthquakes. For medium to high intensity earthquakes, isolators with initial stiffness between 90 to 270 k/ft can be used. For bridges in extreme earthquake zones, the use of isolators should be evaluated based on the earthquake record used and the bridge properties. The results also show that using isolators for bridges with less flexible substructure resulted in a greater reduction in base shear for most cases. The use of isolators with high initial stiffness, resulted in lower base shears in far field cases when compared to near field cases.

Download or read book Fundamentals of Seismic Protection for Bridges written by Mark Yashinsky and published by National Information Centre of Earthquake Engineering. This book was released on 2003 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: With special reference to United States.

Download or read book Seismic Isolation Energy Dissipation and Active Vibration Control of Structures written by Gian Paolo Cimellaro and published by Springer Nature. This book was released on 2023-01-06 with total page 1074 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume gathers the proceedings of the 17th World Conference on Seismic Isolation (17WCSI), held in Turin, Italy on September 11-15, 2022. Endorsed by ASSISi Association (Anti-Seismic Systems International Society), the conference discussed state-of-the-art information as well as emerging concepts and innovative applications related to seismic isolation, energy dissipation and active vibration control of structures, resilience and sustainability. The volume covers highly diverse topics, including earthquake-resistant construction, protection from natural and man-made impacts, safety of structures, vulnerability, international standards on structures with seismic isolation, seismic isolation in existing structures and cultural heritage, seismic isolation in high rise buildings, seismic protection of non-structural elements, equipment and statues. The contributions, which are published after a rigorous international peer-review process, highlight numerous exciting ideas that will spur novel research directions and foster multidisciplinary collaboration among different specialists.

Download or read book Probabilistic Performance Based Optimum Seismic Design of Seismic Isolation for California High Speed Rail Prototype Bridge written by Yong Li and published by . This book was released on 2014 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the last five decades, remarkable progress has been achieved in the field of earthquake engineering, especially in the following areas: seismic design philosophy, earthquake protective systems, seismic design and performance evaluation of structures, and theory of structural optimization. The progress achieved and products developed in these areas can be integrated to develop a desired computer-aided optimum structural design framework. Accordingly, a probabilistic performance-based optimum seismic design (PPBOSD) framework is proposed and first illustrated and validated on a simplified single-degree-of-freedom (SDOF) bridge model optimized (i.e., rated) for a target seismic loss hazard curve. The feasibility and optimality of seismic isolation is investigated for a California High-Speed Rail (CHSR) prototype bridge testbed using the proposed PPBOSD framework, balancing the beneficial and detrimental effects of seismic isolation for such a bridge. Towards this goal, a three-dimensional detailed nonlinear finite element model of the CHSR prototype bridge, including soil-pile-structure interaction and rail-structure interaction, is developed in OpenSees. The seismic response of the isolated bridge is compared to that of the corresponding non-isolated bridge both in deterministic and probabilistic terms. A comprehensive parametric probabilistic demand hazard analysis is carried out to investigate the effects of the seismic isolator properties on the seismic risk of the CHSR prototype bridge. To enable the computationally intensive probabilistic seismic response analyses, a cloud-based optimization framework was used integrating cloud computing resources with the high throughput computing in PPBOSD methodology. Furthermore, some well-posed practical optimization problems are formulated and investigated for seismic isolation in CHSR bridges. In summary, the unique contributions and findings are summarized as follows : (1) A PPBOSD framework is proposed, illustrated, and validated using a nonlinear SDOF bridge model; (2) Compared to a non-isolated bridge, the seismic isolation increases the deck displacement and rail stress demands, while it reduces the seismic demand in the bridge substructure in both the deterministic and probabilistic sense; (3) A cloud-based computing platform is developed for PPBOSD to address the high computational cost; (4) The feasibility and optimality of seismic isolation for the prototype bridge is achieved using the PPBOSD framework, reaching various performance objectives considering the relevant sources of uncertainty.

Download or read book Seismic Bridge Design and Retrofit Structural Solutions written by fib Fédération internationale du béton. Task Group: Seismic design and assessment procedures for bridges and published by FIB - Féd. Int. du Béton. This book was released on 2007 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridge structures can give the impression that they are rather simple structural systems, whose seismic responses can be easily predicted. On the contrary, however, many bridges did not perform well in recent earthquakes, showing a need for increased research to understand various potential problems and collapse mechanisms. Indeed, progress has been made lately in design and assessment procedures around the world, and consequently many practices have changed. In this context, the objective of fib Bulletin 39 is to present, discuss and critically compare structural solutions for bridge seismic design and retrofit that have been developed and are now used all over the world, ten years after the publication of the last comprehensive manual on the subject. It is the result of the work of an international team of experts that collaborated intensively for over three years. The first four chapters of the Bulletin present a regional review of design choices, compare and discuss international design practices, and indicate their relative merits and potential problems. Current developments are treated in the next three chapters, with particular emphasis on design for enhanced damage control, for spatial variation of ground motion and for fault crossing. The last part presents a summary of current issues related to existing bridges. Extensive technical developments have been taking place in the last two decades with the goal of making bridges an important transportation infrastructure with limited damage during earthquakes. Realising this goal depends on regional seismicity, transportation systems, seismic performance goals, local cultures, and a wide range of design and construction practices, which are presented and discussed in this Bulletin.

Download or read book Performance Estimates in Seismically Isolated Bridge Structures written by Gordon P. Warn and published by . This book was released on 2007 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Guide Specifications for Seismic Isolation Design written by and published by AASHTO. This book was released on 2010 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: This edition is based on the work of NCHRP project 20-7, task 262 and updates the 2nd (1999) edition -- P. ix.

Download or read book Seismic Isolation Planned Designed and Detailed written by The Japan Society of Seismic Isolation and published by 日本免震構造協会. This book was released on 2023-11-22 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: ※この商品はタブレットなど大きいディスプレイを備えた端末で読むことに適しています。また、文字だけを拡大することや、文字列のハイライト、検索、辞書の参照、引用などの機能が使用できません。 This book was compiled with the aim of providing reference materials specific to architectural designers (architects and designers) in order to promote further technical improvement and development of seismic isolation buildings. “How has seismic isolation architecture solved the diverse demands and complex problems faced by architecture?” “What are the points of seismic isolation architecture design?” “By dissecting seismic isolation architecture, you can feel more familiar with seismic isolation architecture”. The editorial theme was based on the historical background, such as “Sharing accumulated seismic isolation technology”. Preparations are being made not only by building owners and governments planning projects, but also in economic, cultural, medical, welfare, production, logistics, academic, and other fields where natural disasters occur frequently, and are preparing for major earthquakes that are sure to repeat in the future. This book aims to remove obstacles when considering the introduction of seismically isolated buildings. We hope that this book will be used as a guidebook to protect valuable social capital and illuminate the path to seismically isolated construction.

Download or read book Earthquake Resistant Engineering Structures VII written by M. Phocas and published by WIT Press. This book was released on 2009-04-23 with total page 513 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on the proceedings of the Seventh International Conference on Earthquake Resistant Engineering Structures (ERES), this book presents basic and applied research in the main fields of engineering relevant to earthquake resistant analysis and design of structural systems.

Download or read book Earthquake Resistant Engineering Structures VI written by C. A. Brebbia and published by WIT Press. This book was released on 2007 with total page 529 pages. Available in PDF, EPUB and Kindle. Book excerpt: The problem of protecting the built environment in earthquake-prone regions of the world involves not only the optimal design and construction of new facilities, but also the upgrading and rehabilitation of existing structures and infrastructures. The latter is a laborious and expensive task, which can be accomplished only gradually. However, the inestimable loss of life and the colossal costs following a major earthquake in a metropolitan area provide sufficient reason to make it an important challenge for the scientific and technical community.Containing papers presented at the Sixth International Conference on Earthquake Resistance and Engineering Structures, this book will be invaluable to engineers, scientists and managers working in industry, academia, research organizations and governments. The book encompasses a wide range of topics such as: Site Effects and Geotechnical aspects; Earthquake resistant design; Seismic Behaviour and Vulnerability; Structural Dynamics; Monitoring and Testing; Bridges; Heritage Buildings; Masonry Construction; Retrofitting; Passive Protection Devices and Seismic Isolation; Lifelines; Design Codes and Response Spectre.

Download or read book Earthquake Spectra written by and published by . This book was released on 2003 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Subduction Zone Earthquakes on SDOF Bridge Models written by Yicheng Long and published by . This book was released on 2013 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: Current bridge design codes do not account for the effects of duration of mega-thrust subduction zone earthquakes. Furthermore, codes and even recent performance-based design methodologies only make use of the peak response quantities (forces, displacements, and ductility demands) and do not account for the increased number of inelastic cycles that the structure is expected to experience due to the mega-thrust long-duration subduction zone earthquake ground motions. The main goal of this research is to investigate the effect of subduction zone earthquake ground motions on bridge structures as a first step towards providing basic information for adapting current codes and performance-based design guidelines. To achieve this goal, eighty (80) subduction zone earthquake ground motions are processed and motions from shallow crustal earthquakes with similar spectral shapes are selected. Three simple nonlinear single-degree of freedom (SDOF) models are subjected to the 160 (80 x 2) ground motions and seismic demands are estimated. The SDOF models analyzed include an elasto-plastic with hardening model, a Takeda model, and a model with isolation bearings. The models are representative of recent bridges in California and the Pacific Northwest. Effects of varying the parameters that describe these SDOF models are studied. Effects of P-Delta are also investigated. Four measures of seismic demand are assumed to be correlated to damage that will be sustained by a bridge The seismic demands monitored in these analyses are ductility, energy dissipated (yielding and damping), number of inelastic excursions, and normalized cumulative absolute inelastic displacements. These four measures of seismic demand are assumed to be correlated to the damage that will be sustained by a bridge. Statistical correlation coefficients between ground motion intensity measures that are sensitive to duration (cumulative absolute velocity, significant duration, and arias intensity) and the four measures of seismic demand described above provide for new insight on the effects of duration on bridge structures. To study the effect of the long-motion duration, a parametric sensitivity analysis of simplified nonlinear SDOF models corresponding to cantilever single-column bridge bents is performed. Three different SDOF models are analyzed: an elastoplastic SDOF model, a Takeda-type (stiffness degrading) model, and an isolated bearing system model. For the elastoplastic and Takeda type models, the input parameters of this parametric analysis include: (i) R-factor (26 levels); (ii) hardening ratio (4 levels); (iii) two earthquake types (80 Crustal earthquakes records, 80 Subduction zone earthquakes records); (iv) structural periods (3 levels); (v) P-Delta effect (2 levels). For the SDOF system with the isolation bearing, the input parameters are: (i) period of the bearing (3 levels); (ii) friction coefficient (24 levels); (iii) two earthquake types (80 Crustal earthquakes records, 80 Subduction zone earthquakes records); and (iv) P-Delta effect (2 levels). The Open System for Earthquake Engineering Simulation (OpenSees) software is used to compute the nonlinear dynamic response of each SDOF model and a batch queue system (HTCondor, Thain 2005) is used for running the very large number of simulations efficiently. Comparative statistics of nonlinear response quantities of SDOF systems subjected to crustal earthquakes and subduction zone earthquakes are presented in terms of seismic capacity (normalized strength), and seismic demands (ductility factor, cumulative absolute inelastic displacement, number of inelastic excursions, ratio of damping energy and yielding energy). In addition, for the system with isolation bearings, the effect of the friction coefficient on the isolation bearing displacement, pier base shear, and deck accelerations are studied under these two earthquake types. Lastly, the linear correlation coefficient between the seismic demands and the ground motion intensity measures is presented. In conclusion, this parametric analysis provides insight on the expected damage (and its uncertainty) as a function of various ground motion characteristics of long-duration earthquake records and provides data that can be used later to calibrate design equations that have been developed for crustal ground motions.