Seismic Design And Analysis Of Unbonded Post Tensioned Precast Wall Systems
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Seismic Design And Analysis Of Unbonded Post Tensioned Precast Wall Systems
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Author : Sriram R. Aaleti
language : en
Publisher:
Release Date : 2005
Seismic Design And Analysis Of Unbonded Post Tensioned Precast Wall Systems written by Sriram R. Aaleti and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Following the satisfactory response of the unbonded post-tensioned precast concrete jointed wall system tested for seismic performance as part of the PREcast Seismic Structural Systems (PRESSS) test building, a set of design guidelines was published. Based on these guidelines, Thomas & Sritharan (2003) developed a procedure to analyze the unbonded jointed wall systems. The primary objective of this research is to improve this analysis procedure so that it can be applied to analyze both unbonded post-tensioned single walls and jointed wall systems. Using the experimental data from PRESSS test building, ATLSS research center single wall tests, the accuracy of this analysis procedure and that based on the monolithic beam analogy (MBA) are examined. It was found that both the analysis methods predicted the moment resistance of the walls adequately at the given base rotation. Based on these analysis procedures, revised set of design guidelines are proposed for design of precast jointed wall systems with unbonded post-tensioning steel. A detailed investigation on the influence of several wall parameters on the lateral load behavior of jointed wall system is conducted and a new jointed wall concept refer to as the "jointed wall-column (JWC) system" is proposed. It is shown by analysis that, the JWC system will be more economical than that of an equivalent jointed wall system tested in the PRESSS building.
Seismic Analysis Behavior And Design Of Unbonded Post Tensioned Precast Concrete Walls
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Author : Yahya Cüneyt Kurama
language : en
Publisher:
Release Date : 1997
Seismic Analysis Behavior And Design Of Unbonded Post Tensioned Precast Concrete Walls written by Yahya Cüneyt Kurama and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Buildings, Reinforced concrete categories.
Unbonded post-tensioned precast concrete walls are constructed by joining precast wall panels along horizontal connections using post-tensioning bars that are not bonded to the concrete. The dissertation describes the seismic design and behavior of such walls and addresses the following topics: (1) analytical modeling and behavior of the walls under lateral load; (2) a seismic design approach; (3) design of prototype walls; and (4) dynamic response of the prototype walls under earthquake loading.
Analysis And Validation Of A Seismic Design Method Proposed For Precast Jointed Wall Systems
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Author : Derek James Thomas
language : en
Publisher:
Release Date : 2003
Analysis And Validation Of A Seismic Design Method Proposed For Precast Jointed Wall Systems written by Derek James Thomas and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
Following the satisfactory response of the unbonded post-tensioned precast concrete wall system tested for seismic performance as part of the PREcast Seismic Structural Systems (PRESSS) test building, a set of design guidelines was published. The primary objective of this research is to evaluate the adequacy of the design guidelines and make appropriate recommendations so that the guidelines can be adopted for design of jointed walls in seismic regions. The test data to date on such systems are those collected during the wall direction testing of the PRESSS test building. Hence, this data set has been employed in the validation process. Furthermore, in order to validate the design guidelines over a range of lateral drift levels, an analytical procedure was first developed by reversing the suggested guidelines. Additionally, because of the shortcomings associated with the use of the equivalent stress block concept in design, an alternative analysis method was also considered, which was based on the monolithic beam analogy recommended for jointed systems. The analytical results from monotonic loading were compared to experimental response of the wall established from the PRESSS test building. It was found that both the analysis methods based on PRESSS and MBA predicted the moment response of the wall adequately. However, utilizing the PRESSS guidelines it was found that the neutral axis depth was overestimated by over 100% and the post-tensioning elongation was underestimated by 26%. It was also revealed that the frame contributed to the moment resistance in the wall direction by as much as 25%.
Seismic Response Of Unbonded Post Tensioned Precast Concrete Walls With Ductile Vertical Connections
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Author : James Roland Conley
language : en
Publisher:
Release Date : 2000
Seismic Response Of Unbonded Post Tensioned Precast Concrete Walls With Ductile Vertical Connections written by James Roland Conley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.
Seismic Design And Response Evaluation Of Unbonded Post Tensioned Precast Concrete Walls
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Author :
language : en
Publisher:
Release Date : 1997
Seismic Design And Response Evaluation Of Unbonded Post Tensioned Precast Concrete Walls written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Concrete walls categories.
Seismic Performance And Modeling Of Reinforced Concrete And Post Tensioned Precast Concrete Shear Walls
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Author : Ahmet Can Tanyeri
language : en
Publisher:
Release Date : 2014
Seismic Performance And Modeling Of Reinforced Concrete And Post Tensioned Precast Concrete Shear Walls written by Ahmet Can Tanyeri and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Past earthquakes have shown examples of unsatisfactory performance of buildings using reinforced concrete structural walls as the primary lateral-force-resisting system. In the 1994 Northridge earthquake, examples can be found where walls possessed too much overstrength, leading to unintended failure of collectors and floor systems, including precast and post-tensioned construction. In the 2010 Maule Chile earthquake, many structural wall buildings sustained severe damage. Although Chilean design standards result in different reinforcement detailing than is common in U.S. walls, the failure patterns raise concerns about how well conventionally reinforced structural walls in U.S. buildings will perform during the next earthquake. Alternative wall design philosophies that offer more predictable response, with better damage control, should be investigated. After the Mw 8.8 Chile earthquake, the 15-story Alto Rio building in Concepción sustained failures near the base, overturned, and came to rest on its side. The collapse of the Alto Rio building was significant because it was designed using the Chilean Building Code NCh433. Of96, which requires the use of ACI 318-95 for design of reinforced concrete structural elements intended to resist design seismic forces. The failure of the Alto Rio building is significant for many reasons. It is the first modern shear wall building of its type to collapse by overturning during an earthquake. The building is studied using forensic data and structural models of the framing system subjected to earthquake shaking. The study identifies the likely failure mechanism and suggests areas for which design and detailing practices could be improved. The capabilities and shortcomings of the analyses to identify details of the failure mechanism are themselves important outcomes of the study. A second study explores the behavior of structural wall buildings using unbonded post-tensioned structural walls. Such walls offer the opportunity to better control yielding mechanisms and promote self-centering behavior. The study focuses on the measured responses of a full-scale, four-story building model tested on the E-Defense shaking table in Japan. The seismic force-resisting system of the test building comprised two post-tensioned (PT) precast frames in one direction and two unbonded PT precast walls in the other direction. The building was designed using the latest code requirements and design recommendations available both in Japan and the U.S., including the ACI ITG-5.2-09. The test building was subjected to several earthquake ground motions, ranging from serviceability level to near collapse. Analytical studies were carried out to test the capability of the structural models to replicate behaviors important to structural engineers, and to assess whether available analysis tools are sufficient to model dynamic behavior that results when a full-scale building is subjected to realistic earthquake ground shaking. Measured response data from such an outstanding test provides an opportunity to fully understand the response characteristics of PT walls and assess the ability of nonlinear analytical models to reproduce important global and local responses, including three-dimensional system interactions, both prior to and after loss of significant lateral strength. Moreover, this study to assess behavior and system interaction of PT walls leads to improvements of the current design ideas and performance expectations. The present study examines both the collapse of the Alto Rio building in Chile and the shaking table tests of the unbonded post-tensioned wall building in Japan. The collapse study suggests areas of improvement in current design and detailing practice. The shaking table study suggests an alternative approach to design of shear walls in buildings. Both studies demonstrate the use of modern structural analysis tools to interpret building responses to earthquake shaking. Taken together, the studies provide added confidence in earthquake simulation capabilities and demonstrate alternatives for designing earthquake-resistant buildings that use structural walls.
Analytical Modeling And Lateral Load Behavior Of Unbonded Post Tensioned Precast Concrete Walls
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Author :
language : en
Publisher:
Release Date : 1998
Analytical Modeling And Lateral Load Behavior Of Unbonded Post Tensioned Precast Concrete Walls written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Concrete walls categories.
Seismic Analysis And Design Of Buildings Equipped With Propped Rocking Wall Systems
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Author : Afsoon Nicknam
language : en
Publisher:
Release Date : 2015
Seismic Analysis And Design Of Buildings Equipped With Propped Rocking Wall Systems written by Afsoon Nicknam and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Propped Rocking Wall (PRW) is an innovative technology which combines passive damping with unbonded post-tensioned rocking concrete walls. This system has been proposed to reduce economic losses associated with earthquakes by returning a building to a functional state following a design seismic event. The proposed seismic force-resisting system consists of a slender unbonded post-tensioned concrete wall which is "propped" near the top with multi-story diagonal steel braces equipped with passive supplemental damping devices. In this study, a closed-form solution was derived for the global hysteretic response of the PRW system and a parametric study was conducted to evaluate the effect of different structural parameters involved. A seismic Direct Displacement-Based Design (DDBD) procedure for buildings equipped with PRW systems was then developed. The proposed design procedure was first evaluated through a comparative study between the seismic performance of the introduced system as opposed to a similar system called Propped Shear Walls (PSW) from which the proposed system was originally inspired. The adequacy of the proposed DDBD procedure and further the performance of PRWs were then evaluated through a shake table testing program. Detailed modeling of the PRW test model was developed and validated with shake table test results. Numerical modeling of the PRW on the prototype scale was further adopted and used in a seismic vulnerability assessment study based on the Methodology presented in FEMA P695. Design verifications were then extended to taller buildings equipped with the proposed Propped Rocking Wall (PRW) system. For this purpose, the seismic response of an 8-story building was evaluated against the predetermined performance objectives set in the beginning of the design procedure. In addition, the sensitivity of the response parameters under consideration to three main design parameters was studied.
Seismic Design Of Precast Concrete Building Structures
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Author : fib Fédération internationale du béton
language : en
Publisher: fib Fédération internationale du béton
Release Date : 2003-01-01
Seismic Design Of Precast Concrete Building Structures written by fib Fédération internationale du béton and has been published by fib Fédération internationale du béton this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-01-01 with Technology & Engineering categories.
The aim of this state-of-art report is to present current practices for use of precast and prestressed concrete in countries in seismic regions, to recommend good practice, and to discuss current developments. The report has been drafted by 30 contributors from nine different countries. This state-of-art report covers: state of the practice in various countries; advantages and disadvantages of incorporating precast reinforced and prestressed concrete in construction; lessons learned from previous earthquakes; construction concepts; design approaches; primary lateral load resisting systems (precast and prestressed concrete frame systems and structural walls including dual systems) diaphragms of precast and prestressed concrete floor units; modelling and analytical methods; gravity load resisting systems; foundations; and miscellaneous elements (shells, folded plates, stairs and architectural cladding panels). Design equations are reported where necessary, but the emphasis is on principles. Ordinary cast-in-place reinforced concrete is not considered in this report. This fib state-of-the-art report is intended to assist designers and constructors to provide safe and economical applications of structural precast concrete and at the same time to allow innovation in design and construction to continue. This Bulletin N° 27 was approved as an fib state-of-art report in autumn 2002 byfib Commission 7, Seismic design.
Seismic Design Analysis And Behavior Of Reinforced Concrete Coupled Shear Wall Systems With Post Tensioned Coupling Beams
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Author : Steven M. Barbachyn
language : en
Publisher:
Release Date : 2019
Seismic Design Analysis And Behavior Of Reinforced Concrete Coupled Shear Wall Systems With Post Tensioned Coupling Beams written by Steven M. Barbachyn and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.