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Seismic Performance Of Buckling Restrained Braced Frames With And Without Manufacturing Defects Subjected To Combined In Plane And Out Of Plane Loading
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Book Synopsis Seismic Performance of Buckling Restrained Braced Frames with and Without Manufacturing Defects Subjected to Combined In-plane and Out-of-plane Loading by : Jian Cui
Download or read book Seismic Performance of Buckling Restrained Braced Frames with and Without Manufacturing Defects Subjected to Combined In-plane and Out-of-plane Loading written by Jian Cui and published by . This book was released on 2021 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance Evaluation of Steel Buckling Restrained Braced Frames Subjected to Far-Field, Near-Field, and Long-Duration Earthquakes by : Fokruddin Ahmad
Download or read book Performance Evaluation of Steel Buckling Restrained Braced Frames Subjected to Far-Field, Near-Field, and Long-Duration Earthquakes written by Fokruddin Ahmad and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of Buckling Restrained Brace Frames (BRBFs) has been increasing in recent decades due to their ability to provide superior seismic performance and enhance the resilience of buildings against earthquakes. However, not many studies have extensively and thoroughly investigated the response and resiliency of prescriptively designed BRBF buildings to varying types of earthquake hazards. This study fills that research gap by investigating the seismic performance of two code-designed BRBFs prototype buildings subjected to far-field, near field with pulse and without pulse, and long-duration ground motion sets. The first phase of the study investigated the seismic resiliency of the prescriptively designed BRBF buildings and compared them to identical prototypes designed with mass timber PT-CLT rocking walls using the FEMA P-58 methodology to compare seismic losses. The seismic loss investigation was part of a larger study evaluating the two types of structural systems using multiple criteria decision analysis across four performance categories of seismic resiliency, global warming potential, superstructure cost, and durability. The global warming potential and superstructure cost estimate was completed by others, but this study completed the seismic resiliency assessment and multiple criteria decision analysis.The second phase of this dissertation work analyzed the structural response of the two BRBF prototype buildings across four sets of ground motions representing different hazard levels in Seattle, WA. The two prototype buildings were modeled in 3D using OpenSeesPy to understand the effect of different ground motion types on the structural responses. The analysis results showed that near-field motions increase the deformation demands, such as inter-story drift and maximum ductility in the pulse direction. Though BRBFs are not a self-centering systems, only the upper two floors of the mid-rise building experienced residual drift higher than 0.2%, which is the threshold for expecting minor repair and structural realignment. None of the stories had residual inter-story drift exceeding 0.5% drift for any motion sets. Overall, the code minimum based BRBF buildings showed excellent performance across all the different hazard types. However, the one caveat of this analysis was that long-duration motions had significantly higher cumulative ductility demand than other motion sets.Therefore, the final phase of this dissertation works further investigated the cumulative deformation demand on BRBF braces under long-duration motions. It is important to verify the ductility of the braces through analysis or testing because they act as the primary structural fuse to dissipate the earthquake energy. The final study compared different loading protocols from different countries to the nonlinear modeling results of long-duration motions. It was determined that the long duration motions had over 80% probability of exceeding the current AISC 341 required testing protocol. To rectify these issues, a new loading protocol appropriate for long-duration earthquakes was proposed that accounts for the increased plastic deformation demand and matches the cyclic content of the nonlinear dynamic analyses.In conclusion, these studies have demonstrated that prescriptively designed BRBFs that meet code minimum requirements are a high performing lateral force resisting system to a range of earthquake hazards. They have excellent seismic resiliency, even when not optimized during design through nonlinear time history analysis, as is common in performance-based earthquake engineering. Additionally, the code-designed BRBF buildings were not predicted to have high residual inter-story drifts, which means they are highly likely to be repairable with minor adjustments and re-alignment. However, it was identified that long-duration earthquakes will increase the ductility demand on the braces significantly compared to far-field and near-field earthquakes and that current minimum testing requirements do not account for this increase. A new protocol was proposed to rectify this one challenge with BRBFs.
Book Synopsis Guide to Stability Design Criteria for Metal Structures by : Ronald D. Ziemian
Download or read book Guide to Stability Design Criteria for Metal Structures written by Ronald D. Ziemian and published by John Wiley & Sons. This book was released on 2010-02-08 with total page 1120 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Blast Loading Effect on Buckling Restrained Braced Frames by : Frank Chavarin
Download or read book Blast Loading Effect on Buckling Restrained Braced Frames written by Frank Chavarin and published by . This book was released on 2018 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: Buckling -restrained braced frames are being used around the world to resist lateral loads on structures. They are used due to their high ductility after yielding and the ability to absorb energy. This paper focuses on blast loading on buckling-restrained braced frames. One archetype is looked at in detailed while only the important components are looked at for a second. The main archetype is the chevron braced frame and the second, is the v-braced frame. The two are subjected to a short duration blast load that last 21.7 ms. They are analyzed while the brace core thickness is increased by half an inch. In conclusion, the brace core thickness played a significant role in reducing deformation. The chevron brace also performed significantly better than the v-braced frame. This was due to the position of the braces which created more out of plane deformation in the v-frame archetype. It also witnesses more x-deformation as well as damage.
Book Synopsis Improved Seismic Performance of Buckling Restrained Braced Frames by : Adam S. Christopulos
Download or read book Improved Seismic Performance of Buckling Restrained Braced Frames written by Adam S. Christopulos and published by . This book was released on 2005 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Behavior, Performance and Design of Steel Concentrically Braced Frame Systems by : Keith D. Palmer
Download or read book Seismic Behavior, Performance and Design of Steel Concentrically Braced Frame Systems written by Keith D. Palmer and published by . This book was released on 2012 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation describes a research program on special concentrically braced frame (SCBF) and buckling-restrained braced frame (BRBF) systems. The study builds upon previous work performed as part of a research program supported by the George E. Brown Network for Earthquake Engineering Simulation (NEES) entitled "International Hybrid Simulation of Tomorrow's Braced Frame." This program was initiated due to practical and experimental evidence that SCBFs were not performing as intended by current seismic design provisions. The current study includes a comprehensive experimental and analytical program which included two first-of-its-kind, two-story, one-bay by one-bay SCBF and BRBFs experiments. The experiments were performed at the University of Minnesota NEES laboratory to take advantage of its ability to apply large-displacement bi-directional loading. The two specimens were configured with braces in two orthogonal bays framing into a ``shared'' column with a floor system designed and constructed to simulate realistic conditions. The first specimen, the SCBF, employed HSS3x3x1/4 braces in a single-story X-configuration with one continuous brace and a pair of spliced braces in the opposing direction. The second test specimen, the BRBF, employed pin-ended, collared BRBs in a single-diagonal configuration. The analytical study consisted of a large suite of finite element simulations aimed at identifying the main parameters that influence the damage at the beam-column-gusset connection region in BRBFs and to make recommendations for the design and detailing of this connection region. This research has resulted in a number of findings including the observation that out-of-plane loading and deformation had little impact on the drift and ductility capacity of the system when compared to planar frame test results. In fact, the drift capacity of the SCBF test frame was only 6% less than that of comparable planar frames while the ductility and cumulative ductility capacities of the BRBF exceeded that of many of the planar BRBF system tests. Based on the experimental and analytical findings, design and detailing recommendations were developed for the connection at the brace splice point in the single-story, X-configured system. Design and detailing recommendations were also made for the corner gusset plate connection region in BRBFs.
Book Synopsis Seismic Performance of Buckling Restrained Braced Frame Systems by : Stephen A. Mahin
Download or read book Seismic Performance of Buckling Restrained Braced Frame Systems written by Stephen A. Mahin and published by . This book was released on 2004 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis NEHRP Recommended Provisions (National Earthquake Hazards Reduction Program) for Seismic Regulations for New Buildings and Other Structures: Commentary by : United States. Federal Emergency Management Agency
Download or read book NEHRP Recommended Provisions (National Earthquake Hazards Reduction Program) for Seismic Regulations for New Buildings and Other Structures: Commentary written by United States. Federal Emergency Management Agency and published by . This book was released on 2001 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Behavior of Active Beam Links in Eccentrically Braced Frames by : Keith D. Hjelmstad
Download or read book Seismic Behavior of Active Beam Links in Eccentrically Braced Frames written by Keith D. Hjelmstad and published by . This book was released on 1983 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Behavior and Performance of Buckling-restrained Braced Frame Connections by : Victoria R. Wigle
Download or read book Seismic Behavior and Performance of Buckling-restrained Braced Frame Connections written by Victoria R. Wigle and published by . This book was released on 2008 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Capacity Design Methods for Strongback Braced Frames by : Peter C. Talley
Download or read book Capacity Design Methods for Strongback Braced Frames written by Peter C. Talley and published by . This book was released on 2018 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: When subjected to strong earthquake ground motions, conventional steel braced frames are vulnerable to soft-story mechanisms, whereby the weakest story accumulates more damage relative to the rest of the structure. This reduces the overall strength of the structure, increases the cost of repairs, and can cause issues during the design process due to the reduced redundancy of the system. One method for mitigating this behavior is the use of an elastic spine frame. These frames combine a stiff vertical "spine", such as a truss or shear wall, with a more ductile, energy-dissipating system. The spine typically spans the height of the structure and is designed to remain elastic, distributing earthquake demands across the height of the structure and bridging weak stories. One proposed elastic spine frame is the "strongback" braced frame, which merges a steel buckling-restrained braced frame and an elastic truss, using the buckling-restrained braces for energy dissipation and the truss for force distribution. However, strongback braced frames do not have well-established design criteria. Specifically, there is no generally accepted method for ensuring that the strongback remains elastic, and seismic performance factors have not been developed. Additionally, conventional capacity design underestimates the demands on the spine. It is desirous to have a method for design of these frames that hews closely to existing methods utilizing the equivalent lateral force method. This thesis presents the first phase of a study to address these gaps in the design provisions and to better understand the behavior of this system. A suite of building frames which employ the strongback system were designed with the intent of using them as the basis for parametric analytical studies in the second phase. The suite of frames was selected using the requirements of FEMA P695, the state-of-the-art method for determining seismic performance factors. Three alternative capacity design methods were developed and compared to basic capacity design to identify which is best suited to efficiently achieve the performance objectives. The methods were evaluated for efficiency in the design process, and for feasibility of the resulting designs. However, evaluation of performance objectives is the goal of future study.
Book Synopsis Buckling Restrained Braced Frames as a Seismic Force Resisting System by : Brandon W. Fuqua
Download or read book Buckling Restrained Braced Frames as a Seismic Force Resisting System written by Brandon W. Fuqua and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The hazards of seismic activity on building structures require that engineers continually look for new and better methods of resisting seismic forces. Buckling restrained braced frames (BRBF) are a relatively new lateral force resisting system developed to resist highly unpredictable seismic forces in a very predictable way. Generally, structures with a more ductile lateral force resisting system perform better in resisting high seismic forces than systems with more rigid, brittle elements. The BRBF is a more ductile frame choice than special concentrically braced frames (SCBF). The ductility is gained through brace yielding in both compression and tension. The balanced hysteretic curve this produces provides consistent brace behavior under extreme seismic loads. However regular use of the BRB is largely limited to Japan where the brace type was first designed. The wide acceptance of buckling restrained braced frames requires the system to become easily designable, perform predictably, and common to engineers. This report explains the design process to help increase knowledge of the design and background. This report also details a comparison of a BRBF to a SCBF to give familiarity and promote confidence in the system. The design process of the BRBF is described in detail with design calculations of an example frame. The design process is from the AISC Seismic Provisions with the seismic loads calculated according to ASCE 7 equivalent lateral force procedure. The final members sizes of the BRBF and SCBF are compared based on forces and members selected. The results of the parametric study are discussed in detail.
Book Synopsis Buckling-restrained Braced Frame Connection Design and Testing by : Bradly B. Coy
Download or read book Buckling-restrained Braced Frame Connection Design and Testing written by Bradly B. Coy and published by . This book was released on 2007 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Possible limitations in the design may arise under the presence of increased shear loads, concrete floor slabs, or out-of-plane loading. Additional testing is recommended.
Book Synopsis Seismic Retrofitting of Conventional Reinforced Concrete Moment-Resisting Frames Using Buckling Restrained Braces by : Zaid Al-Sadoon
Download or read book Seismic Retrofitting of Conventional Reinforced Concrete Moment-Resisting Frames Using Buckling Restrained Braces written by Zaid Al-Sadoon and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Earthquake Engineering by : Yousef Bozorgnia
Download or read book Earthquake Engineering written by Yousef Bozorgnia and published by CRC Press. This book was released on 2004-05-11 with total page 958 pages. Available in PDF, EPUB and Kindle. Book excerpt: This multi-contributor book provides comprehensive coverage of earthquake engineering problems, an overview of traditional methods, and the scientific background on recent developments. It discusses computer methods on structural analysis and provides access to the recent design methodologies and serves as a reference for both professionals and res
Book Synopsis Rapid Visual Screening of Buildings for Potential Seismic Hazards: Supporting Documentation by :
Download or read book Rapid Visual Screening of Buildings for Potential Seismic Hazards: Supporting Documentation written by and published by Government Printing Office. This book was released on 2015 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Rapid Visual Screening (RVS) handbook can be used by trained personnel to identify, inventory, and screen buildings that are potentially seismically vulnerable. The RVS procedure comprises a method and several forms that help users to quickly identify, inventory, and score buildings according to their risk of collapse if hit by major earthquakes. The RVS handbook describes how to identify the structural type and key weakness characteristics, how to complete the screening forms, and how to manage a successful RVS program.
Book Synopsis Seismic Design and Qualification of All-steel Buckling-restrained Braced Frames for Canadian Applications by : Morteza Dehghani
Download or read book Seismic Design and Qualification of All-steel Buckling-restrained Braced Frames for Canadian Applications written by Morteza Dehghani and published by . This book was released on 2016 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
