Seismic Response Of Precast Segmental Bridge Superstructures
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Seismic Response Of Precast Segmental Bridge Superstructures
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Author : Marc John Veletzos
language : en
Publisher:
Release Date : 2006
Seismic Response Of Precast Segmental Bridge Superstructures written by Marc John Veletzos and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Bridges categories.
The Seismic Response Of Precast Segmental Bridge Superstructures With Bonded Tendons
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Author : Marc John Veletzos
language : en
Publisher:
Release Date : 2007
The Seismic Response Of Precast Segmental Bridge Superstructures With Bonded Tendons written by Marc John Veletzos and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Bridges categories.
Precast segmental construction of bridges can accelerate construction and minimize the cost of bridges in highly congested urban environments, environmentally sensitive regions, difficult to access ravines, and wide river crossings where medium to long repetitive spans are needed. Despite their proven benefits, the use of precast segmental bridges in seismic regions of the United States remains very limited. A main obstacle to their use is concern regarding the seismic response of segment joints. Recent research has shown that segment joints can undergo very large rotations that open up gaps in the superstructure, while maintaining its load carrying capacity, and with little, if any, damage. This dissertation investigates the seismic response of precast segmental bridges using detailed 2D non-linear time-history analyses and focuses on the behavior of segment-to-segment joints constructed using the balanced cantilever method. The joint model was calibrated using results available from experimental work on large scale sub-assemblages. Analytical models of full scale precast segmental bridges with geometries and characteristics, similar to the Otay River Bridge and the San Francisco-Oakland Bay Bridge Skyway in California, were also used in this study. A suite of twenty near field earthquake records was used to determine the median joint response as well as to quantify the effect of vertical motion on the joint response. The earthquake records were scaled using two different scaling methods and the effect on the structure response was studied. Four different pre-earthquake stress conditions were studied to determine if the effects of creep, shrinkage and temperature impact the seismic response of segment joints. In addition, a preliminary investigation into the possibility of removing a portion of the superstructure longitudinal post-tensioning and allowing non-linear elastic response of the segment joints during a significant seismic event was performed. Results indicated that vertical earthquake motions and the pre-earthquake stress-state can alter the response of segment joints. The results also showed that the method of record scaling does not significantly alter the median response, but may effect the variation in response. Furthermore, reducing the longitudinal post-tensioning near the piers may be possible provided that service load cases do not govern the design.
Seismic Performance Of Precast Segmental Bridge Superstructures
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Author :
language : en
Publisher:
Release Date : 2002
Seismic Performance Of Precast Segmental Bridge Superstructures written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Bridges categories.
Seismic Performance Of Precast Segmental Bridge Superstructures
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Author : Manu Garg
language : en
Publisher:
Release Date : 2002
Seismic Performance Of Precast Segmental Bridge Superstructures written by Manu Garg and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
Seismic Testing Of Precast Segmental Bridges Phase Iii
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Author :
language : en
Publisher:
Release Date : 2005
Seismic Testing Of Precast Segmental Bridges Phase Iii written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Concrete bridges categories.
This report discusses the main findings of a test examining the seismic behavior of a precast, post-tensioned, segmental bridge superstructure with a cast-in-pl ace, hollow, rectangular column. The half-scale specimen modeled a prototype bri dge from midspan to midspan and down to midheight of the column. The bridge was built using the balanced cantilever method and the tendon layout of the specimen was designed to most closely match that of the prototype segment joints nearest to the column. The test was completed in two stages; the first stage prestressi ng level was designed to avoid any joint openings. This was a validation of exis ting bridge design procedures in which damage is limited to the column, and the superstructure remains elastic. The second stage involved removing some of the t endons to enable inelastic deformations of the joints in the superstructure and to impose on the joints nearest the column a more severe loading condition. The second stage of the test was done as an introductory examination of the performa nce of a bridge when damage is not limited to the column and inelastic motion is allowed in the superstructure. The primary objectives of the test were to inves tigate the response of the opening of the superstructure joints, column-superstr ucture interaction, and plastic hinge formation in the column, and the anticipat ed system failure mechanism. Extensive Instrumentation was used in the column as well as the joints of the superstructure to record the damage and performance o f those bridge components.
Seismic Response Of Unbonded Post Tensioned Precast Concrete Segmental Bridge Columns
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Author : Joshua Tyler Hewes
language : en
Publisher:
Release Date : 2000
Seismic Response Of Unbonded Post Tensioned Precast Concrete Segmental Bridge Columns written by Joshua Tyler Hewes 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 Performance Of Precast Segmental Bridge Superstructures
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Author : Robert K. Dowell
language : en
Publisher:
Release Date : 2001
Seismic Performance Of Precast Segmental Bridge Superstructures written by Robert K. Dowell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with segmental construction categories.
Seismic Analysis And Design Of Precast Concrete Segmental Bridges
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Author : Petros Sideris
language : en
Publisher:
Release Date : 2012
Seismic Analysis And Design Of Precast Concrete Segmental Bridges written by Petros Sideris and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
In this dissertation, the concept of hybrid sliding-rocking (HSR) precast concrete post-tensioned segmental members for seismic applications in bridges is introduced and investigated experimentally and numerically. The HSR members lie into the framework of accelerated bridge construction techniques (ABC) and are primarily intended for applications in moderate and high seismicity areas. The HSR members combine two fundamental components, namely the HSR segmental joints, and the internal unbonded post-tensioning. The HSR joints utilize relative segment-to-segment sliding (joint sliding) and gap opening (joint rocking) to mitigate the applied seismic loading. Joint sliding offers high energy dissipation with minor structural damage as well as moderate self-centering. On the other hand, joint rocking offers low energy dissipation and high self-centering capabilities that deteriorate at larger rocking rotations due to the resulting concrete crushing.^The response of HSR joints is affected by the geometry of the post-tensioning (PT) system along the member length. Hence, linear or nonlinear PT geometry may be used to control joint and member response properties. Two distinct types of HSR members were further studied: (i) HSR members with slip-dominant joints and linear PT geometry (abbreviated as HSR-SD members), and (ii) HSR members with rocking- dominant joints and nonlinear PT geometry (abbreviated as HSR-RD members). The concept of HSR bridges was evaluated through a two-stage experimental study. The first stage included shake table testing of a large-scale (~ 1:2. 39) single-span bridge specimen incorporating a HSR-RD superstructure and two HSR-SD single-column piers. Nearly 150 seismic tests were conducted including far-field and near-fault input motions scaled to different seismic hazard levels.^The second stage included quasi-static testing of the HSR-SD piers with a sequence of displacement-controlled loading cycles of increasing amplitude that eventually reached a drift ratio of approximately 15%. The experimental findings from the large-scale seismic and quasi-static testing programs were complemented by two additional experimental studies; one focusing on the identification of the frictional properties of the HSR joint interface, and another investigating the response of the strand-anchor systems (i.e., unbonded monostrands with their anchorage setups at their ends). Numerical predictions for the quasi-static testing were provided by a model of the HSR-SD pier generated with the ABAQUS general-purpose finite element software, while numerical predictions for the seismic testing were provided by a model of the HSR bridge specimen generated in SAP2000. Comparisons between numerical and experimental results are presented.^This dissertation is concluded with an investigation of the response properties of flexibility-based (or force-based) beam-column elements in the presence of softening section constitutive relations. This study identified and explained critical numerical instability problems observed during the development of force-based elements for HSR members.
Seismic Design And Performance Of Precast Concrete Segmental Bridge Columns
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Author : Joshua T. Hewes
language : en
Publisher:
Release Date : 2002
Seismic Design And Performance Of Precast Concrete Segmental Bridge Columns written by Joshua T. Hewes and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
Seismic Proof Testing Of Precast Segmental Bridge Superstructures With Lightly Stressed Continuity Tendons
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Author : Jeffrey Warren Densley
language : en
Publisher:
Release Date : 2003
Seismic Proof Testing Of Precast Segmental Bridge Superstructures With Lightly Stressed Continuity Tendons written by Jeffrey Warren Densley 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.