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Author: Stefan Wijanto Publisher: ISBN: Category : Earthquake resistant design Languages : en Pages : 406
Book Description
The recent series of damaging earthquakes in Christchurch, New Zealand (NZ) has encouraged greater recognition of the post-earthquake economic impacts on NZ society and higher emphasis on low-damage earthquake resisting systems. Buckling Restrained Braces (BRB) are seen as a significant contender for such a system. They have been developed and used in both North America and Japan and are recognised for their superior seismic performance compared to existing concentrically braced systems due to the suppression of brace buckling in compression, and hence the development of equal strength and stiffness under tension and compression loading. However, the focus of development in those countries has been on establishing a testing regime to which companies produce patented systems. This has limited their application in New Zealand due to small demand and has generated interest in development of a generic solution. This research project focuses on the development of a reliable design procedure and detailing requirements for a generic BRB system. This started with the development of a design procedure based on modifications of the concentrically braced frame (CBF) design procedure contained in HERA Report R4-76 (1995). This has been used to develop a representative design for a 10 storey building, from which a brace size and bay has been chosen for experimental testing. A series of dynamic sub-assemblage tests were performed at the University of Auckland on this BRB frame with two different brace connection configurations to gauge the performance of the designed system. The results are presented and discussed herein. An initial prototype model for analytical modelling of the sub-assemblage frame has also been constructed and subjected to inelastic time history analyses. The experimental tests show stable hysteresis loops which is a principal feature of the BRB system, albeit with the occurrence of slack in the connections. These test results show the reliability of the proposed design procedure and detailing, especially after procedural modifications to prevent slack from occurring in the two different connection systems.
Author: Stefan Wijanto Publisher: ISBN: Category : Earthquake resistant design Languages : en Pages : 406
Book Description
The recent series of damaging earthquakes in Christchurch, New Zealand (NZ) has encouraged greater recognition of the post-earthquake economic impacts on NZ society and higher emphasis on low-damage earthquake resisting systems. Buckling Restrained Braces (BRB) are seen as a significant contender for such a system. They have been developed and used in both North America and Japan and are recognised for their superior seismic performance compared to existing concentrically braced systems due to the suppression of brace buckling in compression, and hence the development of equal strength and stiffness under tension and compression loading. However, the focus of development in those countries has been on establishing a testing regime to which companies produce patented systems. This has limited their application in New Zealand due to small demand and has generated interest in development of a generic solution. This research project focuses on the development of a reliable design procedure and detailing requirements for a generic BRB system. This started with the development of a design procedure based on modifications of the concentrically braced frame (CBF) design procedure contained in HERA Report R4-76 (1995). This has been used to develop a representative design for a 10 storey building, from which a brace size and bay has been chosen for experimental testing. A series of dynamic sub-assemblage tests were performed at the University of Auckland on this BRB frame with two different brace connection configurations to gauge the performance of the designed system. The results are presented and discussed herein. An initial prototype model for analytical modelling of the sub-assemblage frame has also been constructed and subjected to inelastic time history analyses. The experimental tests show stable hysteresis loops which is a principal feature of the BRB system, albeit with the occurrence of slack in the connections. These test results show the reliability of the proposed design procedure and detailing, especially after procedural modifications to prevent slack from occurring in the two different connection systems.
Author: David J. Miller Publisher: ISBN: Category : Languages : en Pages :
Book Description
Although conventional earthquake-resisting structural systems provide adequate life safety when properly designed, they often rely on significant structural damage to dissipate the seismic energy. The structural damage and the residual drift that may result from the inelastic response can make a building difficult, if not financially unreasonable, to repair after an earthquake. As a result, development of systems that return to their initial position (i.e., 0́−self-center0́+) following an earthquake and minimize structural damage is a crucial need. The research presented in this thesis aims to address this need by creating an innovative self-centering brace for advanced seismic performance. In the present study, the seismic behavior and performance of self-centering buckling-restrained braces (SC-BRBs) using shape memory alloys (SMAs) is investigated. The SC-BRBs consist of a typical BRB component, which provides energy dissipation, and pre-tensioned superelastic NiTi shape memory alloy rods, which provide self-centering. The SMA rods are attached to the BRB portion of the brace using a set of concentric tubes and free-floating anchorage plates that cause the SMA rods to elongate when the brace is both in tension and compression. Using a five-story building as context, half-scale SC-BRBs are designed and fabricated for experimental validation. To characterize hysteretic response, the braces are subjected to a cyclic loading protocol adapted from the AISC Seismic Provisions for Structural Steel Buildings. The results of the experiments are used to validate an SC-BRB model in OpenSEES, which is used to conduct further parametric studies of SC-BRB behavior.
Author: Pierre Thibault Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Contemporary seismic-resistant design of steel structures relies on the dissipation of earthquake energy through significant inelastic deformations. Buckling-restrained braced frames (BRBFs) are a type of concentrically-braced system characterized by braces that yield both in tension and in compression. Thanks to a restraining mechanism that confines a ductile steel core, buckling-restrained braces (BRBs) can take advantage of the cyclic ductility of the steel material. However, BRBs commonly display a low post-yield stiffness, causing substantial interstory drifts and large residual drifts after seismic events. Moreover, yielding of the core is often tied to only a single performance objective, thus making its response at other levels of seismicity largely unpredictable. Hybrid BRB solutions are explored as an alternative to the traditional BRB system to overcome its limitations. The hybrid concept is hinged on harnessing different characteristics from different materials that are carefully combined into one ductile design to achieve a desirable response. This numerical study has three main objectives. Potential core metals are first evaluated to determine the best combinations of two materials with complementary engineering properties. Analysis of experimental data indicates that the post-yield behavior of hybrid BRBs is improved by employing 350WT carbon steel in conjunction with another metal, which possesses a low-yield and high-strain-hardening capacity (e.g., 304L stainless steel, 5083-O aluminum alloy, A36 carbon steel, or LYP-100 low-yield-point steel). Afterwards, two new hybrid BRB systems are designed to accommodate the complex deformation pattern of three core plates connected in parallel. The first proposed option has a restraining mechanism made from concrete-filled steel tubes, while the second hybrid BRB option is fabricated exclusively from metal plate components. Lastly, multiple finite element simulations are carried out on numerical models to quantitatively validate the performance enhancement. Compared to conventional BRBs, hybrid BRBs exhibit an improved strain hardening response, a slight increase in axial stiffness, and a greater energy dissipation capability for an equivalent brace strength.
Author: Thomas Paulay Publisher: Wiley-Interscience ISBN: 9780471549154 Category : Technology & Engineering Languages : en Pages : 768
Book Description
Emphasizes actual structural design, not analysis, of multistory buildings for seismic resistance. Strong emphasis is placed on specific detailing requirements for construction. Fundamental design principles are presented to create buildings that respond to a wide range of potential seismic forces, which are illustrated by numerous detailed examples. The discussion includes the design of reinforced concrete ductile frames, structural walls, dual systems, reinforced masonry structures, buildings with restricted ductility and foundation walls. In addition to the examples, full design calculations are given for three prototype structures.
Author: Theodore V. Galambos Publisher: John Wiley & Sons ISBN: 0470037784 Category : Technology & Engineering Languages : en Pages : 386
Book Description
Practical guide to structural stability theory for the design of safe steel structures Not only does this book provide readers with a solid foundation in structural stability theory, it also offers them a practical, working knowledge of how this theory translates into design specifications for safe steel structures. Structural Stability of Steel features detailed discussions of the elastic and inelastic stability of steel columns, beams, beam-columns, and frames alongside numerous worked examples. For each type of structural member or system, the authors set forth recommended design rules with clear explanations of how they were derived. Following an introduction to the principles of stability theory, the book covers: * Stability of axially loaded planar elastic systems * Tangent-modulus, reduced-modulus, and maximum strength theories * Elastic and inelastic stability limits of planar beam-columns * Elastic and inelastic instability of planar frames * Out-of-plane, lateral-torsional buckling of beams, columns, and beam-columns The final two chapters focus on the application of stability theory to the practical design of steel structures, with special emphasis on examples based on the 2005 Specification for Structural Steel Buildings of the American Institute of Steel Construction. Problem sets at the end of each chapter enable readers to put their newfound knowledge into practice by solving actual instability problems. With its clear logical progression from theory to design implementation, this book is an ideal textbook for upper-level undergraduates and graduate students in structural engineering. Practicing engineers should also turn to this book for expert assistance in investigating and solving a myriad of stability problems.
Author: Ronald D. Ziemian Publisher: John Wiley & Sons ISBN: 0470085258 Category : Technology & Engineering Languages : en Pages : 1120
Book Description
The definitive guide to stability design criteria, fully updated and incorporating current research Representing nearly fifty years of cooperation between Wiley and the Structural Stability Research Council, the Guide to Stability Design Criteria for Metal Structures is often described as an invaluable reference for practicing structural engineers and researchers. For generations of engineers and architects, the Guide has served as the definitive work on designing steel and aluminum structures for stability. Under the editorship of Ronald Ziemian and written by SSRC task group members who are leading experts in structural stability theory and research, this Sixth Edition brings this foundational work in line with current practice and research. The Sixth Edition incorporates a decade of progress in the field since the previous edition, with new features including: Updated chapters on beams, beam-columns, bracing, plates, box girders, and curved girders. Significantly revised chapters on columns, plates, composite columns and structural systems, frame stability, and arches Fully rewritten chapters on thin-walled (cold-formed) metal structural members, stability under seismic loading, and stability analysis by finite element methods State-of-the-art coverage of many topics such as shear walls, concrete filled tubes, direct strength member design method, behavior of arches, direct analysis method, structural integrity and disproportionate collapse resistance, and inelastic seismic performance and design recommendations for various moment-resistant and braced steel frames Complete with over 350 illustrations, plus references and technical memoranda, the Guide to Stability Design Criteria for Metal Structures, Sixth Edition offers detailed guidance and background on design specifications, codes, and standards worldwide.
Author: Andrew H. Buchanan Publisher: John Wiley & Sons ISBN: 0470972890 Category : Technology & Engineering Languages : en Pages : 437
Book Description
Structural Design for Fire Safety, 2nd edition Andrew H. Buchanan, University of Canterbury, New Zealand Anthony K. Abu, University of Canterbury, New Zealand A practical and informative guide to structural fire engineering This book presents a comprehensive overview of structural fire engineering. An update on the first edition, the book describes new developments in the past ten years, including advanced calculation methods and computer programs. Further additions include: calculation methods for membrane action in floor slabs exposed to fires; a chapter on composite steel-concrete construction; and case studies of structural collapses. The book begins with an introduction to fire safety in buildings, from fire growth and development to the devastating effects of severe fires on large building structures. Methods of calculating fire severity and fire resistance are then described in detail, together with both simple and advanced methods for assessing and designing for structural fire safety in buildings constructed from structural steel, reinforced concrete, or structural timber. Structural Design for Fire Safety, 2nd edition bridges the information gap between fire safety engineers, structural engineers and building officials, and it will be useful for many others including architects, code writers, building designers, and firefighters. Key features: • Updated references to current research, as well as new end-of-chapter questions and worked examples. •Authors experienced in teaching, researching, and applying structural fire engineering in real buildings. • A focus on basic principles rather than specific building code requirements, for an international audience. An essential guide for structural engineers who wish to improve their understanding of buildings exposed to severe fires and an ideal textbook for introductory or advanced courses in structural fire engineering.
Author: Akbar R. Tamboli Publisher: McGraw Hill Professional ISBN: 0071550054 Category : Technology & Engineering Languages : en Pages : 654
Book Description
Surveys the leading methods for connecting structural steel components, covering state-of-the-art techniques and materials, and includes new information on welding and connections. Hundreds of detailed examples, photographs, and illustrations are found throughout this handbook. --from publisher description.
Author: Stefan Wijanto
Author: Stefan Wijanto
Author: David J. Miller
Author: Elnaz Talebi
Author: Pierre Thibault
Author: Nasreen B. Pathan (Graduate student)
Author: Thomas Paulay
Author: Theodore V. Galambos
Author: Ronald D. Ziemian
Author: Andrew H. Buchanan
Author: Akbar R. Tamboli