Download or read book Seismic Response of Unbonded Post tensioned Precast Concrete Walls with Ductile Vertical Connections written by James Roland Conley and published by . This book was released on 2000 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Seismic Response of Buildings that Utilise Unbonded Post Tensioned Concrete Walls written by Jonathan Watkins (‡c (PhD)) and published by . This book was released on 2017 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Seismic Design and Response Evaluation of Unbonded Post tensioned Precast Concrete Walls written by and published by . This book was released on 1997 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Seismic Analysis Behavior and Design of Unbonded Post tensioned Precast Concrete Walls written by Yahya Cüneyt Kurama and published by . This book was released on 1997 with total page 491 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Dynamic Response of Unbonded Post tensioned Concrete Walls for Seismic Resilient Structures written by Kimberley M. Twigden and published by . This book was released on 2016 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Seismic Analysis Behavior and Design of Unbonded Post tensioned Precast Concrete Frames written by Magdy El-Sheikh and published by . This book was released on 1997 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of 17th Symposium on Earthquake Engineering Vol 1 written by Manish Shrikhande and published by Springer Nature. This book was released on 2023-08-28 with total page 769 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Seismic Analysis Behavior and Design of Unbonded Post tensioned Precast Concrete Frames written by Magdy Thabet Mahmound El-Sheikh and published by . This book was released on 1997 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt: In unbonded post-tensioned frames, the beam-column connection is constructed by post-tensioning the beams to the columns using strands or bars that are not bonded to the concrete. The clamping force between beam and column provides vertical shear force transfer at the interface between the beam and column, so corbels are not needed. This type of construction provides ductile connections, where under seismic loading, nonlinear behavior occurs in the connections, and the beams and columns remain elastic.

Download or read book The Role of Vertical Connections in the Seismic Response of Precast Composite Walls written by Valerie Thiel and published by . This book was released on 1979 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Seismic Response of Unbonded Post tensioned Precast Concrete Segmental Bridge Columns written by Joshua Tyler Hewes and published by . This book was released on 2000 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Seismic Design and Analysis of Unbonded Post tensioned Precast Wall Systems written by Sriram R. Aaleti and published by . This book was released on 2005 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Analytical Modeling of the Seismic Behavior of Precast Concrete Frame Ductile Connections written by Stefano Pampanin and published by . This book was released on 2000 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book PCI Journal written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advances in Seismic Performance and Risk Estimation of Precast Concrete Buildings written by Andrea Belleri and published by Frontiers Media SA. This book was released on 2022-02-09 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Seismic Response of Precast Bridge Columns with Energy Dissipating Joints written by Sarira Motaref and published by . This book was released on 2011 with total page 707 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Seismic Response of Composite Precast Concrete Walls written by Kenneth Allen Lanham and published by . This book was released on 1977 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NEHRP Commentary on the Gidelines for the Seismic Rehabilitation of Buildings written by Eugene Zeller and published by DIANE Publishing. This book was released on 2000-06 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document from the National Earthquake Hazards Reduction Program (NEHRP) was prepared for the Building Seismic Safety Council (BSSC) with funding from the Federal Emergency Management Agency (FEMA). It provides commentary on the NEHRP Guidelines for the Seismic Rehabilitation of Buildings. It contains systematic guidance enabling design professionals to formulate effective & reliable rehabilitation approaches that will limit the expected earthquake damage to a specified range for a specified level of ground shaking. This kind of guidance applicable to all types of existing buildings & in all parts of the country has never existed before. Illustrated.