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Book Synopsis Damage-free Seismic-resistant Self-centering Friction-damped Braced Frames with Buckling-restrained Columns by : Felix C. Blebo
Download or read book Damage-free Seismic-resistant Self-centering Friction-damped Braced Frames with Buckling-restrained Columns written by Felix C. Blebo and published by . This book was released on 2015 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conventional concentrically braced frame (CBF) systems have limited drift capacity prior to brace buckling, and related damage leads to deterioration in strength and stiffness. CBFs are also susceptible to weak story failure. A pin- supported self-centering friction-damped braced frame system with buckling-restrained columns (FDBF-BRC) is being developed to provide significant drift capacity while limiting damage due to residual drift and soft-story mechanisms. The FDBF-BRC system consists of beams, columns, and braces branching off a central column, with buckling restrained columns (BRCs) incorporated into the system at the first story external column positions. The BRCs and friction generated at lateral-load bearings at each floor level are used to dissipate energy to minimize the overall seismic response of the FDBF-BRC system. Vertically aligned post-tensioning bars provide additional overturning moment resistance and aid in self-centering the system to eliminate residual drift. The pin support condition and the lateral stiffness of the system enable it to exhibit a nearly uniform inter-story drift distribution. In this study, a suite of 44 DBE-level ground motions used in FEMA P695 is numerically applied to several FDBF- BRCs to demonstrate the seismic performance of the system. The results show that the FDBF-BRC system has a nearly uniform inter-story drift response, high ductility, and a high energy dissipation capacity, and is an effective seismic-resistant system.
Book Synopsis Parametric Study of Friction-Damped Braced Frames with Buckling-Restrained Columns Using Recommended Frame and BRC Strength Factors by : Chibuike Anozie
Download or read book Parametric Study of Friction-Damped Braced Frames with Buckling-Restrained Columns Using Recommended Frame and BRC Strength Factors written by Chibuike Anozie and published by . This book was released on 2017 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: The friction-damped braced frame system with buckling restrained columns (FDBF-BRC) is being developed to provide significant drift capacity while limiting damage due to residual drift and soft-story mechanisms. BRCs will be on both ends of the frame, where they will experience tension and compression due to conditioned earthquake simulations on OPENSEES. This research is a continuation of previous work by Dr. David A. Roke's previous graduate student, Dr. Felix C. Blebo, for multiple stories, based on the established design recommendations. This study includes buildings with 4, 6, and 8 stories, with application of recommended frame hardening factor and BRC hardening factor. This system consists of beams, columns, braces interlocking at a central column, a pinned support condition, and BRCs at both external columns of first story. Energy dissipation to minimize overall seismic response on each floor level are products of the incorporated BRCs and friction generated at the lateral-load bearings. A suite of 20 DBE, 20 MCE, and 20 FOE-level ground motions is numerically applied to several FDBF-BRCs. Based on dynamic analysis results, the FDBF-BRC still proves to be an effective seismic-resistant system. The system's performance shows a nearly uniform inter-story drift response, high ductility, and high energy dissipation capacity.
Book Synopsis Parametric Study of Self-centering Concentrically-braced Frames with Friction-based Energy Dissipation by : Brandon Jeffers
Download or read book Parametric Study of Self-centering Concentrically-braced Frames with Friction-based Energy Dissipation written by Brandon Jeffers and published by . This book was released on 2012 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conventional concentrically-braced frame (CBF) systems have limited drift capacity before brace buckling and related damage leads to deterioration in strength and stiffness. Self-centering concentrically-braced frame (SC-CBF) systems have been developed with increased drift capacity prior to initiation of damage. SC-CBF systems are intended to minimize structural damage and residual drift under the design basis earthquake. The behavior of SC-CBF system differs from that of a conventional CBF system in that the SC-CBF columns are designed to uplift from the foundation at a specified level of lateral loading, initiating a rigid-body rotation (rocking) of the frame. Vertically-oriented post-tensioning bars resist uplift and provide a restoring force to return the SCCBF columns to the foundation (self-centering the system). This thesis considers an SC-CBF configuration that includes two sets of columns: the SC-CBF columns, which uplift from the foundation, and the adjacent gravity columns, which do not uplift. Lateral-load bearings between the columns at each floor level transfer the inertia forces from the gravity columns (which are connected to the floor diaphragm) to the SC-CBF (which is not directly connected to the floor diaphragm). Friction at the lateral-load bearings increases the overturning moment capacity of the SCCBF and dissipates energy under cyclic loading. A parametric study of SC-CBFs with friction-based energy dissipation elements is presented in this thesis. Nonlinear static and dynamic analyses of SC-CBFs with different coefficients of friction at the lateral-load bearings are presented to illustrate the effect that changing the coefficient of friction has on the design, behavior, and dynamic response of SC-CBF systems.
Book Synopsis Parametric Study of Seismic-resistant Friction-damped Braced Frame System by : Felix C. Blebo
Download or read book Parametric Study of Seismic-resistant Friction-damped Braced Frame System written by Felix C. Blebo and published by . This book was released on 2013 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conventional braced frame systems have limited drift capacity before brace buckling and related damage leads to deterioration in strength and stiffness. A friction-damped braced frame (FDBF) system is being developed to provide significant drift capacity while limiting damage and residual drift. The FDBF system consists of beams, columns, and braces branching off a central column. Friction at lateral-load bearings that transfer inertia forces from the floor diaphragms to the FDBF is used to dissipate energy, to reduce the overall seismic response of the FDBF system, and to provide overturning moment resistance. Vertically oriented post-tensioning bars provide additional overturning moment resistance and help to reduce residual drift. The thesis introduces a preliminary design approach for FDBF systems. Several FDBF systems are designed, and pushover and dynamic nonlinear analysis results are presented. Dynamic analysis results confirm the expected drift capacity and behavior of the system.
Book Synopsis Damage-free Seismic-resistant Self-centering Concentrically-braced Frames by : David Alan Roke
Download or read book Damage-free Seismic-resistant Self-centering Concentrically-braced Frames written by David Alan Roke and published by . This book was released on 2010 with total page 733 pages. Available in PDF, EPUB and Kindle. Book excerpt: The scope of this study includes the development of a design procedure for SC-CBF systems, a parametric study of different SC-CBF configurations, analytical and experimental studies of a large-scale SC-CBF test structure, and evaluation of the performance of the SC-CBF test structure.
Book Synopsis Seismic Responses of Buckling-restrained Braced Frames and Self-centering Braced Frames by : 范廷海
Download or read book Seismic Responses of Buckling-restrained Braced Frames and Self-centering Braced Frames written by 范廷海 and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Parametric Study and Higher Mode Response Quantification of Steel Self-centering Concentrically-braced Frames by : M. R. Hasan
Download or read book Parametric Study and Higher Mode Response Quantification of Steel Self-centering Concentrically-braced Frames written by M. R. Hasan and published by . This book was released on 2012 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conventional concentrically braced frame (CBF) systems have limited drift capacity prior to structural damage, often leading to brace buckling under moderate earthquake input, which results in residual drift. Self-centering CBF (SC-CBF) systems have been developed to maintain the economy and stiffness of the conventional CBFs while increasing the ductility and drift capacity. SC-CBF systems are designed such that the columns uplift from the foundation at a specified level of lateral loading, initiating a rocking (rigid body rotation) of the frame. Vertically aligned post tensioning bars resist column uplift and provide a restoring force to return the structure to its initial state (i.e., self-centering the system). Friction elements are used at the lateral-load bearings (where lateral load is transferred from the floor diaphragm to the SC-CBF) to dissipate energy and reduce the peak structural response. Previous research has identified that the frame geometry is a key design parameter for SC-CBFs, as frame geometry relates directly to the energy dissipation capacity of the system. This thesis therefore considered three prototype SC-CBFs with differing frame geometries for carrying out a comparative study. The prototypes were designed using previously developed performance based design criteria and modeled in OpenSees to carry out nonlinear static and dynamic analyses. The design and analysis results were then thoroughly investigated to study the effect of changing frame geometry on the behavior of SC-CBF systems. The rocking response in SC systems introduces large higher mode effects in the dynamic responses of structure, which, if not properly addressed during design, can result in seismic demands significantly exceeding the design values and may ultimately lead to a structural failure. To compare higher mode effects on different frames, proper quantification of the modal responses by standard measures is therefore essential. This thesis proposes three normalized quantification measures based on an intensity-based approach, considering the intensity of the modal responses throughout the ground motion duration rather than focusing only on the peak responses. The effectiveness of the three proposed measures and the conventionally used peak-based measure is studied by applying them on dynamic analysis results from several SC-CBFs. These measures are then used to compare higher mode effects on frames with varying geometric and friction properties.
Book Synopsis Seismic Analyses of Self-centering Braced Frames and Buckling-restrained Braced Frames Using the Computer Program SAP2000 by : 範萩賢
Download or read book Seismic Analyses of Self-centering Braced Frames and Buckling-restrained Braced Frames Using the Computer Program SAP2000 written by 範萩賢 and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance-based Assessments of Buckling-restrained Braced Steel Frames Retrofitted by Self-centering Shape Memory Alloy Braces by : Huy Pham
Download or read book Performance-based Assessments of Buckling-restrained Braced Steel Frames Retrofitted by Self-centering Shape Memory Alloy Braces written by Huy Pham and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Concrete-filled buckling restrained braces (BRBs) was first developed in 1988 in Tokyo, Japan, to prevent the steel plates in the core portion from buckling, leading the steel core to exhibiting a more stable and fully hysteretic loop than conventional steel braces. However, past studies have shown that buckling restrained braced frames (BRBFs) have a large residual deformation after a median or high seismic event due to steel's residual strain. In order to address this issue, innovative self-centering SMA braces are proposed and installed in the originally unbraced bays in existing BRBFs to become a hybrid frame system where the existing steel BRBs dissipate energy induced by external forces and the newly added self-centering SMA braces restore the building configuration after the steel BRBs yield. A case study of conventional three-story BRBF retrofitted by the proposed self-centering SMA braces is carried out to develop systematic retrofit strategies, to investigate the structural behavior, and to probabilistically assess their seismic performance in terms of interstory drifts, residual drifts, and brace deformation, as compared to the original steel BRB frames. Finally, the developed brace component fragility curves and system fragility curves will be further used for the assessment of downtime and repair cost.
Book Synopsis Friction Damped Braced Frames by : Parvaneh Baktash
Download or read book Friction Damped Braced Frames written by Parvaneh Baktash and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Kinematics and Preliminary FEMA P-695 Evaluation of the NewZ-BREAKSS Steel Boundary Frame with Buckling Restrained Brace Structural Fuses by :
Download or read book Kinematics and Preliminary FEMA P-695 Evaluation of the NewZ-BREAKSS Steel Boundary Frame with Buckling Restrained Brace Structural Fuses written by and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract : Buckling Restrained Braced Frames (BRBFs) have become a popular seismic force resisting system (SFRS) due to their high ductility and energy dissipation. However, BRBFs are also susceptible to large residual drifts, which can make repair difficult. Efforts to reduce the residual drift of BRBFs typically involve special self-centering braces, or by using a dual system in tandem with the BRBF. This study proposes an alternative approach, in which a self-centering steel rocking frame is used as the boundary frame for the BRBF. The proposed system, called the NewZ-BREAKSS Buckling Restrained Braced Frame (NZ-BRBF) utilizes the recently proposed NewZ-BREAKSS (NZ) boundary frame to increase the post-yield stiffness of the system while concentrating all damage to the BRBs. The NZ-BRBF system is expected to behave similarly to conventional BRBF, but with smaller residual drifts and a boundary frame that remains essentially elastic, simplifying repair. This study presents a numerical investigation of the proposed low-damage SFRS, using the FEMA P-695 methodology as a guiding framework. The results suggest that the NZ-BRBF can exhibit better performance than conventional BRBFs and can be designed with the same response modification factor (R factor) as conventional BRBFs.
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 Stability of Buckling-restrained Braced Frames by : Santiago Raul Zaruma Ochoa
Download or read book Seismic Stability of Buckling-restrained Braced Frames written by Santiago Raul Zaruma Ochoa and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Simulation of Dynamic Impact of Self-centering Concentrically-braced Frames Using LS-DYNA 971 by : Lucie M. Blin-Bellomi
Download or read book Simulation of Dynamic Impact of Self-centering Concentrically-braced Frames Using LS-DYNA 971 written by Lucie M. Blin-Bellomi and published by . This book was released on 2012 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper focuses on the finite element simulation of a self-centering concentrically-braced frame (SC-CBF) using the LS-DYNA 971 solver. SC-CBFs have been developed as a damage-free alternative to conventional concentrically braced frame (CBF) systems. Previous experimental pseudo-dynamic hybrid simulation results for SC-CBF systems indicated that the system works as intended; however, these pseudo-dynamic tests were unable to measure the effect of the mass of the SC-CBF structure on the dynamic response. This thesis analyzes the dynamic effect of the mass on a SC-CBF using the LS-DYNA software. A finite element model (FEM) of a buckling restrained braced frame (BRBF) was built to calibrate an LS-DYNA model to experimental results. This study parallels published experimental and finite element analysis results, and validates the finite element analysis method chosen to conduct the SC-CBF impact study. The objective of the thesis is to determine the effect of the mass of the SC-CBF on dynamic response. A comparative study is undertaken with two different FEMs of the SC-CBF system: one including the mass of the steel, and one treating the steel as massless.
Book Synopsis Passive Energy Dissipation Systems for Structural Design and Retrofit by : Michalakis C. Constantinou
Download or read book Passive Energy Dissipation Systems for Structural Design and Retrofit written by Michalakis C. Constantinou and published by . This book was released on 1998 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Timber Engineering by : Sven Thelandersson
Download or read book Timber Engineering written by Sven Thelandersson and published by John Wiley & Sons. This book was released on 2003-03-14 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Timber construction is one of the most prevalent methods of constructing buildings in North America and an increasingly significant method of construction in Europe and the rest of the world. Timber Engineering deals not only with the structural aspects of timber construction, structural components, joints and systems based on solid timber and engineered wood products, but also material behaviour and properties on a wood element level. Produced by internationally renowned experts in the field, this book represents the state of the art in research on the understanding of the material behaviour of solid wood and engineered wood products. There is no comparable compendium currently available on the topic - the subjects represented include the most recent phenomena of timber engineering and the newest development of practice-related research. Grouped into three different sections, 'Basic properties of wood-based structural elements', 'Design aspects on timber structures' and 'Joints and structural assemblies', this book focuses on key issues in the understanding of: timber as a modern engineered construction material with controlled and documented properties the background for design of structural systems based on timber and engineered wood products the background for structural design of joints in structural timber systems Furthermore, this invaluable book contains advanced teaching material for all technical schools and universities involved in timber engineering. It also provides an essential resource for timber engineering students and researchers, as well as practicing structural and civil engineers.
