Nonlinear Seismic Analysis of Quasi-isolation Systems for Earthquake Protection of Bridges PDF Download
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Languages : en
Pages :
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Author:
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Languages : en
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Author: Jeffrey Ger
Publisher: CRC Press
ISBN: 1439837759
Category : Technology & Engineering
Languages : en
Pages : 396
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Nonlinear static monotonic (pushover) analysis has become a common practice in performance-based bridge seismic design. The popularity of pushover analysis is due to its ability to identify the failure modes and the design limit states of bridge piers and to provide the progressive collapse sequence of damaged bridges when subjected to major earthq
Author: Evan McNeil Lapointe
Publisher:
ISBN:
Category :
Languages : en
Pages : 158
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Within the past decade, seismic isolation systems have gained rapid popularity in the earthquake resistant design of bridge structures. This popularity has come in response to the inadequacy of earlier seismic design and retrofit methodologies. The mechanical shortcomings and subsequent failure mechanisms associated with the early elastic seismic design philosophy are first presented, followed by a study of the applicability of seismic isolation systems in bridge structures. This investigation includes a discussion of the susceptibility of simple span bridges to seismic failure, an overview of the behavior of base isolated structures, a detailed description of isolation system components, an explanation of the mechanics of elastometric isolation bearings, and a presentation of the linear theory of seismic isolation. The qualitative investigation of seismic isolation systems is supplemented by a quantitative nonlinear time-history analysis that illustrates the response of a simple span bridge to seismic excitation. The analysis examines the effects of the varying stiffness of a lead-rubber elastometric bearing upon structural response when subjected to the 1940 El Centro earthquake. The results confirm the expected behavior of isolated structures and emphasize the need for site-specific studies in the design of effective seismic isolation systems for bridge structures.
Author: Andreas J. Kappos
Publisher: Springer Science & Business Media
ISBN: 9400739427
Category : Science
Languages : en
Pages : 232
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The book focuses on the use of inelastic analysis methods for the seismic assessment and design of bridges, for which the work carried out so far, albeit interesting and useful, is nevertheless clearly less than that for buildings. Although some valuable literature on the subject is currently available, the most advanced inelastic analysis methods that emerged during the last decade are currently found only in the specialised research-oriented literature, such as technical journals and conference proceedings. Hence the key objective of this book is two-fold, first to present all important methods belonging to the aforementioned category in a uniform and sufficient for their understanding and implementation length, and to provide also a critical perspective on them by including selected case-studies wherein more than one methods are applied to a specific bridge and by offering some critical comments on the limitations of the individual methods and on their relative efficiency. The book should be a valuable tool for both researchers and practicing engineers dealing with seismic design and assessment of bridges, by both making the methods and the analytical tools available for their implementation, and by assisting them to select the method that best suits the individual bridge projects that each engineer and/or researcher faces.
Author: Osman Eser Ozbulut
Publisher:
ISBN:
Category :
Languages : en
Pages :
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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.
Author:
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 232
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Author: Gian Paolo Cimellaro
Publisher: Springer Nature
ISBN: 3031211871
Category : Science
Languages : en
Pages : 1074
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Book Description
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.
Author: Viacheslav Koval
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Wenying Hu
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages :
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A special class of seismically isolated bridges shares a common feature in that both ends of the superstructure are restrained and isolators over the columns of bridge uncouple the superstructure from the ground motions. They are defined as partial isolation bridges. From measured acceleration responses, effectiveness of full seismic isolation had been confirmed widely. However, the seismic isolation behavior in the partial isolation has not been widely observed. The effectiveness of partial isolation is evaluated in this study. The static design procedures for linear and nonlinear partially isolated bridges are developed. Results from the static analysis of linear and nonlinear partially isolated bridges, compared with conventional and fully isolated bridges, demonstrate that the effectiveness of nonlinear partial isolation is close to full isolation for reducing the yield force and displacement of the columns in some parameter ranges. However, increased seismic demands on the abutment displacement in the bridge are observed. Nonlinear time history analyses of the different bridge models under earthquake excitations are carried out to investigate the accuracy of the design procedure for nonlinear partial isolation. In addition, an example shows the application of nonlinear partial isolation to a practical bridge.
Author: Robert K. Dowell
Publisher:
ISBN:
Category :
Languages : en
Pages : 644
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