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Seismic Performance And Retrofitting Of Reinforced Concrete Bridge Bents
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Book Synopsis Seismic Performance and Retrofitting of Reinforced Concrete Bridge Bents by :
Download or read book Seismic Performance and Retrofitting of Reinforced Concrete Bridge Bents written by and published by . This book was released on 2002 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summary available via the World Wide Web as of 8/29/2002 from the Bridge Research and Information Center web site,
Book Synopsis Seismic Performance and Retrofitting of Reinforced Concrete Bridge Bents by : Claudia P. Pulido-Collantes
Download or read book Seismic Performance and Retrofitting of Reinforced Concrete Bridge Bents written by Claudia P. Pulido-Collantes and published by . This book was released on 2001 with total page 1104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Performance and Retrofit of Multi-column Bridge Bents by : David I. McLean
Download or read book Seismic Performance and Retrofit of Multi-column Bridge Bents written by David I. McLean and published by . This book was released on 1998 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Achieving Operational Seismic Performance of RC Bridge Bents Retrofitted With Buckling-Restrained Braces by :
Download or read book Achieving Operational Seismic Performance of RC Bridge Bents Retrofitted With Buckling-Restrained Braces written by and published by . This book was released on 2017 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: Typical reinforced concrete (RC) bridges built prior to 1970 were designed with minimum seismic consideration, leaving numerous bridges highly susceptible to damage following an earthquake. In order to improve the seismic behavior of substandard RC bridges, this study presents the seismic performance of reinforced concrete bridge bents retrofitted and repaired using Buckling-Restrained Braces (BRBs) while considering subduction zone earthquake demands. In order to reflect displacement demands from subduction ground motions, research studies were conducted to develop quasi-static loading protocols and then investigate their effect on structural bridge damage. Results suggested that subduction loading protocols may reduce the displacement ductility capacity of RC bridge columns and change their failure mode. The cyclic performance of reinforced concrete bridge bents retrofitted and repaired using BRBs was experimentally evaluated using large-scale specimens and the developed loading histories. Three BRB specimens were evaluated with the aim of assessing the influence of these components on the overall performance of the retrofitted and repaired bents. Additionally, subassemblage tests were conducted in an effort to study the response of these elements and to allow for refined nonlinear characterization in the analysis of the retrofitted and repaired systems. The results of the large-scale experiments and analytical studies successfully demonstrated the effectiveness of utilizing buckling-restrained braces for achieving high displacement ductility of the retrofitted and repaired structures, while also controlling the damage of the existing vulnerable reinforced concrete bent up to an operational performance level.
Book Synopsis Seismic Performance of a Retrofitted Reinforced Concrete Bridge Pier by : Matthew John Schoettler
Download or read book Seismic Performance of a Retrofitted Reinforced Concrete Bridge Pier written by Matthew John Schoettler and published by . This book was released on 2004 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Performance of a Model Reinforced Concrete Bridge Pier Before and After Retrofit by : J. B. Mander
Download or read book Seismic Performance of a Model Reinforced Concrete Bridge Pier Before and After Retrofit written by J. B. Mander and published by . This book was released on 1996 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Response of Concrete Bridges by : Kosalram Krishnan
Download or read book Seismic Response of Concrete Bridges written by Kosalram Krishnan and published by . This book was released on 1999 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Retrofit of a Reinforced Concrete Bridge Bent by : Chantal Coulombe
Download or read book Seismic Retrofit of a Reinforced Concrete Bridge Bent written by Chantal Coulombe and published by . This book was released on 2007 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This research project is the second part of a research program carried out by Itagawa (2005) who studied the seismic response of a half-scale model of an existing Montreal bridge built in the 1960's. This project studies the seismic behaviour of the retrofit carried out on the frame structure studied in the first part of the research program. The retrofit was made following the requirements of the current Canadian Highway Bridge Design Code (CHBDC). The philosophy of the CHBDC is to provide flexural yielding in the ductile elements so that brittle failure modes such as shear are prevented. This capacity-design approach resulted in a ductile response and significant energy dissipation of the retrofitted structure." --
Book Synopsis Flexural Performance of Retrofitted Reinforced Concrete Bridge Bents by : Bretton Williams Glenn
Download or read book Flexural Performance of Retrofitted Reinforced Concrete Bridge Bents written by Bretton Williams Glenn and published by . This book was released on 2002 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Retrofit Case Study of Reinforced Concrete Bridges with Buckling Restrained Braces by :
Download or read book Seismic Retrofit Case Study of Reinforced Concrete Bridges with Buckling Restrained Braces written by and published by . This book was released on 2017 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: This case study investigates the buckling restrained braces (BRB) retrofit concept as compared to traditional retrofit measures for a sample of typical vulnerable bridges in Oregon. The objectives of evaluating these cases were to determine the feasibility of the concept both in terms of performance as well as construction costs. This study builds on the ongoing research at Portland State University into the development of the fuse retrofit concept for Oregon highway bridges and follows recently completed large scale laboratory tests of BRB retrofitted bents. Three reinforced concrete highway bridges were selected from the Oregon Department of Transportation (ODOT) bridge inventory to represent a typical layout that characterizes numerous bridges that are seismically vulnerable across Oregon. The three bridges included varying skews and pier cap beam configurations to determine the impact of these characteristics on the seismic retrofit implementation and performance. Seismic vulnerability assessments of the existing bridges were conducted in accordance with the guidelines of the ODOT Bridge Design and Drafting Manual (BDDM). Preliminary designs were then developed considering conventional retrofit measures as well as the newly proposed retrofit measure utilizing BRBs as ductile fuses. Comparison was then made among the bridges relative to their expected seismic performance and estimated retrofit construction cost.
Book Synopsis Seismic Behavior and Retrofit of Older Reinforced Concrete Bridge T-joints by : Laura N. Lowes
Download or read book Seismic Behavior and Retrofit of Older Reinforced Concrete Bridge T-joints written by Laura N. Lowes and published by . This book was released on 1995 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of experimental tests investigating the seismic response of reinforced concrete beam-column T-joints was recently completed at the University of California, Berkeley. The evaluated connection was representative of an interior beam- column joint from a multi-column bridge frame built in the late 1950's. Three one-third scale models, representing the as-built connection and two retrofit connections, were tested. The results of this research project are an improved understanding of the seismic behavior of lightly reinforced bridge T-joints as well as verification of a design procedure for retrofitting this type of connection.
Book Synopsis Seismic Performance Evaluation of Reinforced Concrete Bridge Piers Considering Postearthquake Capacity Degradation by : Borislav Todorov
Download or read book Seismic Performance Evaluation of Reinforced Concrete Bridge Piers Considering Postearthquake Capacity Degradation written by Borislav Todorov and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridges play a key role in the transportation sector while serving as lifelines for the economy and safety of communities. The need for resilient bridges is especially important following natural disasters, where they serve as evacuation, aid, and supply routes to an affected area. Much of the earthquake engineering community is interested in improving the resiliency of bridges, and many contributions to the field have been made in the past decades, where a shift towards performancebased design (PBD) practices is underway. While the Canadian Highway Bridge Design Code (CHBDC) has implemented PBD as a requirement for the seismic design of lifeline and major route bridges, the nature of PBD techniques translate to a design process that is not universally compatible for all scenarios and hazards. Therefore, there is great benefit to be realised in the development of PBD guidelines for mainshock-aftershock seismic sequences for scenarios in which the chance to assess and repair a bridge is not possible following a recent mainshock. This research analytically explored a parameterized set of 20 reinforced concrete bridge piers which share several geometrical and material properties with typical bridge bents that support many Canadian bridges. Of those piers, half are designed using current PBD guidelines provided in the 2019 edition of the CHBDC, whereas the remaining half are designed with insufficient transverse reinforcement commonly found in the bridges designed pre-2000. To support this study, a nonlinear fiber-based modelling approach with a proposed material strength degradation scheme is developed using the OpenSEES finite element analysis software. A multiple conditional mean spectra (CMS) approach is used to select a suite of 50 mainshock-aftershock ground motion records for the selected site in Vancouver, British Columbia, which consist of crustal, inslab, and interface earthquakes that commonly occur in areas near the Cascadia Subduction zone. Nonlinear time history analysis is performed for mainshock-only and mainshock-aftershock excitations, and static pushover analysis is also performed in lateral and axial directions for the intact columns, as well as in their respective post-MS and post-AS damaged states. Using the resulting data, a framework for post-earthquake seismic capacity estimation of the bridge piers is developed using machine learning regression methods, where several candidate models are tuned using an exhaustive grid search algorithm approach and k-fold crossvalidation. The tuned models are fitted and evaluated against a test set of data to determine a single best performing model using a multiple scorer performance index as the metric. The resulting performance index suggests that the decision tree model is the most suitable regressor for capacity estimation due to this model exhibiting the highest accuracy as well as lowest residual error. Moreover, this study also assessed the fragility of the bridge piers subjected to mainshock-only and mainshock-aftershock earthquakes. Probabilistic seismic demand models (PSDMs) are derived for the columns designed using current PBD guidelines (PBD-compliant) to evaluate whether the current PBD criteria is sufficient for resisting aftershock effects. Additional PSDMs are generated for the columns with inadequate transverse reinforcement (PBD-deficient) to assess aftershock vulnerability of older bridges. The developed fragility curves indicate an increased fragility of all bridge piers for all damage levels. The findings indicate that adequate aftershock performance is achieved for bridge piers designed to current (2019) CHBDC extensive damage level criteria. Furthermore, it is suggested that minimal damage performance criteria need to be developed for aftershock effects, and the repairable damage level be reintroduced for major route bridges.
Book Synopsis Seismic Performance of Retrofitted Reinforced Concrete Bridge Piers by : Robert A. Presland
Download or read book Seismic Performance of Retrofitted Reinforced Concrete Bridge Piers written by Robert A. Presland and published by . This book was released on 2001 with total page 513 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Flexural Strength Variations on the Seismic Performance of Reinforced Concrete Multiple Column Bridge Bents by : Mark Lee Marsh
Download or read book Effects of Flexural Strength Variations on the Seismic Performance of Reinforced Concrete Multiple Column Bridge Bents written by Mark Lee Marsh and published by . This book was released on 1991 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design Guidelines for Assessment Retrofit and Repair of Bridges for Seismic Performance by : M. J. N Priestley
Download or read book Design Guidelines for Assessment Retrofit and Repair of Bridges for Seismic Performance written by M. J. N Priestley and published by . This book was released on 1992 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Performance of Retrofitted Reinforced Concrete Bridge Piers by : Robert Andrew Presland
Download or read book Seismic Performance of Retrofitted Reinforced Concrete Bridge Piers written by Robert Andrew Presland and published by . This book was released on 1999 with total page 513 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Performance Design Criteria for Bridge Bent Plastic Hinge Regions by : A. K. M. Golam Murtuz
Download or read book Seismic Performance Design Criteria for Bridge Bent Plastic Hinge Regions written by A. K. M. Golam Murtuz and published by . This book was released on 2020 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of this research was to quantify the material strain limits for seismic assessment of existing sub-standard reinforced concrete bridge bents considering operational performance design criteria. Limited confidence exists in the current material strain limit state for operational performance criteria due to lack of experimental results considering the typical detailing of Oregon bridges and the cumulative damage effect resulting from an anticipated long-duration Cascadia Subduction Zone (CSZ) event. Component details for bridge bents such as geometry and reinforcing details were determined through a statistical analysis of available bridge drawings built prior to 1990 in the State of Oregon. Three full-scale bridge bent column-footing subassembly specimens were constructed and subjected to reverse cyclic lateral deformations utilizing a traditional loading protocol and a protocol representing the demands expected from a CSZ earthquake. The tests were designed so that variable axial loading could be applied in order to simulate the secondary effects experienced in a column that is part of a multi-column bent during an earthquake event. Material strains along with global and local deformation quantities were measured with a suite of external and internal sensors mounted to and embedded in the specimens. Despite having sub-standard seismic detailing, all three specimens exhibited ductile behavior under reverse cyclic lateral loading, achieving a minimum displacement ductility of 8.0. The obtained results also suggest that the material strain limits currently used for the seismic evaluation of existing bridges in Oregon considering operational performance criteria are conservative, but may still require further experimental validation. Finally, strain limits based on previous research at Portland State University (PSU) were compiled and combined with the results from this study to propose recommended strain limit values.
