Seismic Design And Response Evaluation Of Unbonded Post Tensioned Precast Concrete Walls
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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.
Dynamic Response Of Unbonded Post Tensioned Concrete Walls For Seismic Resilient Structures
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Author : Kimberley M. Twigden
language : en
Publisher:
Release Date : 2016
Dynamic Response Of Unbonded Post Tensioned Concrete Walls For Seismic Resilient Structures written by Kimberley M. Twigden and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Concrete walls categories.
The research in this thesis was conducted with the primary aim of advancing the current state of knowledge of unbonded Post-Tensioned (PT) precast concrete rocking walls. Emphasis was placed on systematically investigating both the static and dynamic experimental response of Single Rocking Wall (SRW) and Precast Wall with End Columns (PreWEC) systems. Using the experimental data generated, simple numerical modelling techniques were investigated and the Direct Displacement Based Design (DDBD) process was verified. The experimental programme consisted of component tests on modified energy dissipating Oconnectors and pseudo-static cyclic, snap back, and shake table testing on a selection of SRW and PreWEC systems. The unique experimental investigation into the cyclic response of an improved O-connector confirmed the suitability of the O-connector as a cost effective energy dissipater that is able to demonstrate stable hysteretic behaviour while being easy to install and replace. The focus of the wall tests was on assessing the general wall response and design, the influence of the O-connectors on the wall panel, initial stiffness and fundamental frequency, equivalent viscous damping and residual drifts from different loading types. During the wall tests only minor damage and negligible residual drifts were observed which confirmed the desirable seismic behaviour of SRW and PreWEC systems under both static and dynamic loads. An investigation was performed using a simple single degree of freedom numerical model to provide recommendations on appropriate damping schemes that are able to emulate the seismic response of SRW and PreWEC systems that were validated using the shake table test results. The numerical analyses indicated that good estimation of the seismic response could be attained when using 2% tangent stiffness proportional damping in combination with a hysteretic behaviour calibrated to the cyclic hysteresis. Lastly, an assessment of current methods used for determining the equivalent viscous damping for unbonded PT walls systems in the current DDBD framework was performed. A current method based on the weighted contribution of an unbonded PT only system and a purely dissipative system was found to produce good results when used with the proposed bilinear force-displacement idealisation based on an effective stiffness.
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.
Seismic Response Of Buildings That Utilise Unbonded Post Tensioned Concrete Walls
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Author : Jonathan Watkins (‡c (PhD))
language : en
Publisher:
Release Date : 2017
Seismic Response Of Buildings That Utilise Unbonded Post Tensioned Concrete Walls written by Jonathan Watkins (‡c (PhD)) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Concrete walls categories.
Unbonded post-tensioned precast concrete walls are a low-damage seismic resisting system that resist lateral loads by rocking at the wall base. This thesis addresses the uncertainty that wall-to-floor interaction can have on the seismic response and performance of buildings that use such wall systems. A computational model was developed and verified to accurately calculate the bi-directional lateral-load response of isolated post-tensioned concrete walls. The wall model was extended to represent a previously tested full scale, four storey building with post-tensioned concrete walls. The building model accurately captured the measured response of the test building that was subjected to increasing intensities of earthquake motion on a tri-directional shake-table. To accurately capture the seismic response of the building the model must represent the in-plane and out-of-plane floor behaviour, account for cracking of the floor, and represent the stiffness of the precast concrete floor units. Wall-to-floor interaction resulted in deformations that were concentrated in the link slab between the wall and adjacent precast floor unit of the test building. This deformation resulted in significant over-strength demands on the wall and column, which the dynamic loading further increased. During the 1995 Kobe earthquake motion the peak wall base shear from the building model was 110% greater compared to the same building model that did not account for wall-to-floor interaction or dynamic loading. A parametric study of the building model found that increasing the rib depth of the precast floor elements or the thickness of the floor resulted in significantly greater over-strength demands compared to the original building. The results of the parametric study confirmed that if the effects of wall-to-floor interaction are not considered as part of the design process, the inelastic mechanisms that develop when a building is subjected to an earthquake may be different than predicted and result in undesirable failure modes An innovative wall-to-floor connector that could eliminate the adverse effects of wall-to-floor interaction was experimentally subjected to the combination of vertical displacement and shear forces they would experience in a major earthquake. Within their design limits the connectors performed well and effectively isolated the floor from the walls vertical displacement while transferring shear force from the floor to the wall.
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 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.
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%.
Proceedings Of 17th Symposium On Earthquake Engineering Vol 1
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Author : Manish Shrikhande
language : en
Publisher: Springer Nature
Release Date : 2023-08-28
Proceedings Of 17th Symposium On Earthquake Engineering Vol 1 written by Manish Shrikhande and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-08-28 with Science categories.
This book presents select proceedings of the 17th Symposium on Earthquake Engineering organized by the Department of Earthquake Engineering, Indian Institute of Technology Roorkee. The topics covered in the proceedings include engineering seismology and seismotectonics, earthquake hazard assessment, seismic microzonation and urban planning, dynamic properties of soils and ground response, ground improvement techniques for seismic hazards, computational soil dynamics, dynamic soil–structure interaction, codal provisions on earthquake-resistant design, seismic evaluation and retrofitting of structures, earthquake disaster mitigation and management, and many more. This book also discusses relevant issues related to earthquakes, such as human response and socioeconomic matters, post-earthquake rehabilitation, earthquake engineering education, public awareness, participation and enforcement of building safety laws, and earthquake prediction and early warning system. This book is a valuable reference for researchers and professionals working in the area of earthquake engineering.
Seismic Analysis Behavior And Design Of Unbonded Post Tensioned Precast Concrete Frames
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Author : Magdy El-Sheikh
language : en
Publisher:
Release Date : 1997
Seismic Analysis Behavior And Design Of Unbonded Post Tensioned Precast Concrete Frames written by Magdy El-Sheikh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Earthquake resistant design categories.
Proceedings Of The 2nd International Conference On Advanced Civil Engineering And Smart Structures
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Author : TianQiao Liu
language : en
Publisher: Springer Nature
Release Date :
Proceedings Of The 2nd International Conference On Advanced Civil Engineering And Smart Structures written by TianQiao Liu and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.