Author:
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 566

View

Book Description
Summary available via the World Wide Web as of 8/29/2002 from the Bridge Research and Information Center web site,

Author: Claudia P. Pulido-Collantes
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 1104

View

Book Description

Author: David I. McLean
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 68

View

Book Description

Author:
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 363

View

Book Description
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.

Author: Matthew John Schoettler
Publisher:
ISBN:
Category :
Languages : en
Pages : 318

View

Book Description

Author: J. B. Mander
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 161

View

Book Description

Author: Kosalram Krishnan
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 392

View

Book Description

Author: Chantal Coulombe
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 150

View

Book Description
"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." --

Author: Bretton Williams Glenn
Publisher:
ISBN:
Category : Concrete bridges
Languages : en
Pages : 182

View

Book Description

Author:
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 36

View

Book Description
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.