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Estimating The Seismic Response Of Base Isolated Buildings Including Torsion Rocking And Axial Load Effects
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Book Synopsis Estimating the Seismic Response of Base-isolated Buildings Including Torsion, Rocking, and Axial-load Effects by : Keri Lynn Ryan
Download or read book Estimating the Seismic Response of Base-isolated Buildings Including Torsion, Rocking, and Axial-load Effects written by Keri Lynn Ryan and published by . This book was released on 2005 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Response Control and Seismic Isolation of Buildings by : Masahiko Higashino
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 414 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.
Book Synopsis Seismic Response of Base Isolated Buildings Considering Pounding to Moat Walls by : Armin Masroor Shalmani
Download or read book Seismic Response of Base Isolated Buildings Considering Pounding to Moat Walls written by Armin Masroor Shalmani and published by . This book was released on 2013 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seismic isolation offers a simple and direct opportunity to control or even eliminate damage to structures subjected to ground shaking by simultaneously reducing deformations and acceleration demands. A base isolation system decouples the superstructure from the ground resulting in elongation of fundamental period of the structure and reducing the accelerations transferred to superstructure during ground shaking. However, increasing the fundamental period of the structure is mostly accompanied by increased displacement demands. In base isolated structures, this large displacement is concentrated at base level where seismic isolation devices are installed and designed to handle these large deformations without damage. A typical base isolated basement design requires a space in which the building is free to move sideways without hitting the surrounding structure. This space is commonly referred to as the "moat". Structural design codes such as ASCE 7-05 that regulate the design of buildings incorporating seismic base isolation systems require the minimum moat wall clearance distance equal to the maximum displacement at the base of the structure under the Maximum Considered Earthquake (MCE), although the superstructure is designed for design basis earthquake (DBE) level. Despite the cautious regulation for moat wall gap distance, pounding of base isolated buildings to moat walls has been reported in previous earthquakes. In conventional structures, the pounding problem between adjacent structures of buildings and highway bridges has been a major cause of seismic damage, even collapse, during earthquakes in the past several decades. Current design specifications may not adequately account for the large forces generated during impact in base isolated buildings. This study investigates the pounding phenomenon in base isolated buildings from both experimental and analytical perspectives by conducting shake table pounding experiments, developing effective models for impact to moat walls and evaluating the adequacy of code specifications for the gap distance of moat walls. A series of prototype base isolated moment and braced buildings designed by professional engineers for the purpose of this project is presented and one of the models was selected for a quarter scale shake table test with moat walls. The pounding experiments indicate that the contact forces generated during pounding can induce yielding in the superstructure and amplify the response acceleration at all stories of the building. The response amplification and damage depends on the gap distance, moat wall properties, and impact velocity. A detailed finite element model of the test setup is developed in OpenSees. An analytical study on the dynamic behavior of the moat walls resulted in proposing a new impact element. Numerical simulation using the proposed impact element compares well with experimental results. A series of collapse studies using the Methodology in FEMA P695 was conducted for both prototype models at various gap distances. The collapse probability of base isolated models used in this study and the effect of moat wall gap distance on the probability of collapse for base isolated structures is investigated. These studies verify that pounding to moat walls at the required gap distance by ASCE7-05 result in acceptable probability of collapse for the flexible and ductile moment frame models examined. However, the braced frame shows a notable drop in collapse margin ratio because of pounding to moat wall at the required gap distance and requires increasing the gap distance by 17%. to have an acceptable collapse probability.
Book Synopsis Relative Performance Comparison and Loss Estimation of Seismically Isolated and Fixed-based Buildings Using PBEE Approach by : Prayag J. Sayani
Download or read book Relative Performance Comparison and Loss Estimation of Seismically Isolated and Fixed-based Buildings Using PBEE Approach written by Prayag J. Sayani and published by . This book was released on 2009 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Current design codes generally use an equivalent linear approach for preliminary design of a seismic isolation system. The equivalent linear approach is based on effective parameters, rather than physical parameters of the system, and may not accurately account for the nonlinearity of the isolation system. The second chapter evaluates an alternative normalized strength characterization against the equivalent linear characterization. Following considerations for evaluation are included: (1) ability to effectively account for variations in ground motion intensity, (2) ability to effectively describe the energy dissipation capacity of the isolation system, and (3) conducive to developing design equations that can be implemented within a code framework. Although current code guidelines specify different seismic performance objectives for fixed-base and isolated buildings, the future of performance-based design will allow user-selected performance objectives, motivating the need for a consistent performance comparison of the two systems. Based on response history analysis to a suite of motions, constant ductility spectra are generated for fixed-base and isolated buildings in chapter three. Both superstructure force (base shear) and deformation demands in base-isolated buildings are lower than in fixed-base buildings responding with identical deformation ductility. To compare the relative performance of many systems or to predict the best system to achieve a given performance objective, a response index is developed and used for rapid prototyping of response as a function of system characteristics. When evaluated for a life safety performance objective, the superstructure design base shear of an isolated building is competitive with that of a fixed-base building with identical ductility, and the isolated building generally has improved response. Isolated buildings can meet a moderate ductility immediate-occupancy objective at low design strengths whereas comparable ductility fixed-base buildings fail to meet the objective. In chapter four and five, the life cycle performance of code-designed conventional and base-isolated steel frame buildings is evaluated using loss estimation methodologies. The results of hazard and structural response analysis for three-story moment resisting frame buildings are presented in this paper. Three-dimensional models for both buildings are created and seismic response is assessed for three scenario earthquakes. The response history analysis results indicate that the performance of the isolated building is superior to the conventional building in the design event. However, for the Maximum Considered Earthquake, the presence of outliers in the response data reduces confidence that the isolated building provides superior performance to its conventional counterpart. The outliers observed in the response of the isolated building are disconcerting and need careful evaluation in future studies.
Book Synopsis Effects of Vertical Motion on Seismic Response of Base-isolation System by : Tom B. Wang
Download or read book Effects of Vertical Motion on Seismic Response of Base-isolation System written by Tom B. Wang and published by . This book was released on 1995 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Enhanced Seismic Resiliency for Buildings Via Base Isolation by : Michelle Carolyn Chen
Download or read book Enhanced Seismic Resiliency for Buildings Via Base Isolation written by Michelle Carolyn Chen and published by . This book was released on 2018 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: Base isolation is an effective technology for reducing seismic damage to both structural and nonstructural components, as well as to building contents, allowing buildings to remain functional during and in the aftermath of a rare and strong intensity earthquake. This makes it an ideal seismic response modification system for hospitals and buildings of high importance. Despite the enhanced seismic resiliency of buildings incorporating base isolation, many countries have been slow to adopt it in building designs prior to experiencing the devastating effects of a major earthquake, often embracing the technology as an outcome. The goal of the research in this dissertation is to advance the understanding of base isolation, in order to diminish some of the barriers that impede its widespread use. This dissertation uses data collected from a shake table experiment of a full-scale five-story building outfitted with nonstructural components and systems to analyze the structural response of the building in both base isolated and fixed base configurations. By simulating a realistic environment, this project documents the destructive effects of an earthquake with and without base isolation, ultimately demonstrating the technology's effectiveness in minimizing structural demands. Another test that was conducted addressed the specific response of an isolator in realistic earthquake conditions. One of the barriers that prevents the use of base isolation in certain scenarios is because of gaps in knowledge due to lack of testing. To address this, a comprehensive multiaxial testing program of a high damping rubber bearing was performed, fully characterizing the bearing in six degrees of freedom, to understand the impact of realistic loading conditions on the isolator response. Finally, base isolation is often implemented in buildings specifically to protect nonstructural components and ensure functionality of the building after an earthquake. Despite this, current design codes do not specifically address nonstructural components within base isolated buildings. This dissertation proposes a framework for designing inertia-sensitive nonstructural components within base isolated buildings. The framework is demonstrated through a case study using experimental structural response data in conjunction with simulated nonstructural responses generated by relative displacement floor response spectra for inelastic response.
Book Synopsis NUREG/CR. by : U.S. Nuclear Regulatory Commission
Download or read book NUREG/CR. written by U.S. Nuclear Regulatory Commission and published by . This book was released on 1977 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report written by and published by . This book was released on 2005 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Response of Base Isolated Buildings Considering Pounding to Moat Walls by : Armin Masroor
Download or read book Seismic Response of Base Isolated Buildings Considering Pounding to Moat Walls written by Armin Masroor and published by . This book was released on 2013 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study investigates the pounding phenomenon in base isolated buildings by conducting shake table pounding experiments, developing analytical models for impact to moat walls, and evaluating the adequacy of code specifications for the gap distance of moat walls. The experiments indicated that the contact forces generated during pounding can induce yielding in the superstructure and amplify the response acceleration at all stories of the building. The response amplification and damage depends on the gap distance, moat wall properties, and impact velocity. A detailed finite element model of the test setup was developed in OpenSees and an analytical study on the dynamic behavior of the moat walls resulted in proposing a new impact element. The numerical simulation showed good agreement with the experimental results. Finally, a series of collapse studies using the FEMA P695 methodology was conducted to determine the collapse probability of the base isolated models and the effect of moat wall gap distance on the probability of collapse. These studies verified that pounding to moat walls at the gap distance required by ASCE7-05 results in an acceptable probability of collapse for flexible and ductile moment frame models. However, the braced frame showed a notable drop in collapse margin ratio because of pounding to the moat wall at the required gap distance and requires increasing the gap distance by 17%.to achieve an acceptable collapse probability.
Book Synopsis Seismic Response of Base-isolated Buildings Using a Viscoelastic Model by :
Download or read book Seismic Response of Base-isolated Buildings Using a Viscoelastic Model written by and published by . This book was released on 1993 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to recent developments in elastomer technology, seismic isolation using elastomer bearings is rapidly gaining acceptance as a design tool to enhance structural seismic margins and to protect people and equipment from earthquake damage. With proper design of isolators, the fundamental frequency of the structure can be reduced to a value that is lower than the dominant frequencies of earthquake ground motions. The other feature of an isolation system is that it can provide a mechanism for energy dissipation. In the USA, the use of seismic base-isolation has become an alternate strategy for advanced Liquid Metal-cooled Reactors (LMRs). ANL has been deeply involved in the development and implementation of seismic isolation for use in both nuclear facilities and civil structures for the past decade. Shimizu Corporation of Japan has a test facility at Tohoku University in Sendai, Japan. The test facility has two buildings: one is base isolated and the other is conventionally founded. The buildings are full-size, three-story reinforced concrete structures. The dimensions and construction of the superstructures are identical. They were built side by side in a seismically active area. In 1988, the ANL/Shimizu Joint Program was established to study the differences in behavior of base-isolated and ordinarily founded structures when subjected to earthquake loading. A more comprehensive description of this joint program is presented in a companion paper (Wang et al. 1993). With the increased use of elastomeric polymers in industrial applications such as isolation bearings, the importance of constitutive modeling of viscoelastic materials is more and more pronounced. A realistic representation of material behavior is essential for computer simulations to replicate the response observed in experiments.
Book Synopsis Seismic Response of Base-isolated Structures Using Lead-rubber Bearings with Tension Capability by : W. H. Lee
Download or read book Seismic Response of Base-isolated Structures Using Lead-rubber Bearings with Tension Capability written by W. H. Lee and published by . This book was released on 1990 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Response of Base-isolated Buildings Using a Viscoelastic Model by :
Download or read book Seismic Response of Base-isolated Buildings Using a Viscoelastic Model written by and published by . This book was released on 1993 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Response of Base-isolated Buildings by : Khaled Mohamed Amin Abdou
Download or read book Seismic Response of Base-isolated Buildings written by Khaled Mohamed Amin Abdou and published by . This book was released on 1990 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1989 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Estimation of the Seismic Response of Buildings and the Effect of Different Scaling Methods for Ground Motion by : Sundar Ram Krishna Murthy Mohan Ram
Download or read book Estimation of the Seismic Response of Buildings and the Effect of Different Scaling Methods for Ground Motion written by Sundar Ram Krishna Murthy Mohan Ram and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Response of a Base-isolated Building with High Damping-low Modulus Elastometric Bearings by : Y. W. Chang
Download or read book Seismic Response of a Base-isolated Building with High Damping-low Modulus Elastometric Bearings written by Y. W. Chang and published by . This book was released on 1993 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Response Analysis of Base Isolated Secondary Systems by : George Abdallah Ghantous
Download or read book Seismic Response Analysis of Base Isolated Secondary Systems written by George Abdallah Ghantous and published by . This book was released on 1991 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
