Seismic Performance of Steel Plate Girder Bridges with Integral Abutments
Seismic Performance of Steel Plate Girder Bridges with Integral Abutments

Author: U. S. Department Transportation

Publisher: CreateSpace

Published: 2013-04-24

Total Pages: 168

ISBN-13: 9781484198179

DOWNLOAD EBOOK

This report presents the results of a pilot study on the seismic behavior and response of steel bridges with integral abutments. Analytical investigations were conducted on computational models of steel bridges with integral abutments to determine their seismic behavior as a system and to develop seismic design guidelines. The effect of the superstructure flexibility due to inadequate embedment length was investigated using 3D finite element models. This flexibility, modeled as translational and rotational springs, proved to have significant effect on the overall bridge dynamic characteristics in terms of periods and critical mode shapes. Lateral and longitudinal load paths and the seismic response were investigated using modal pushover and nonlinear time history analyses. A limited investigation on the effect of skew was conducted on a single-span integral abutment bridge. A procedure for incorporating the system level damping due to the yielding and inelastic responses of various components was proposed for use in the seismic analysis. Based on the analytical investigations and available experimental research, guidelines for the seismic analysis and design of integral abutment bridges were developed.

Seismic Performance of Steel Girder Bridge Superstructures with Ductile End Cross Frames and Seismic Isolation
Seismic Performance of Steel Girder Bridge Superstructures with Ductile End Cross Frames and Seismic Isolation

Author:

Publisher:

Published: 2004

Total Pages: 688

ISBN-13: 9780496081707

DOWNLOAD EBOOK

The assumption that the superstructure of a bridge will remain elastic during large earthquake excitation is not necessarily valid for steel plate girder bridges. Past earthquakes have shown considerable damage to end cross frames, bearings, bearing stiffeners and other superstructure components, largely attributed to transverse excitation. These components need to be designed to resist the effects of seismic loading. The potential to use the end cross frames to reduce the seismic demand on a bridge is investigated in this dissertation and compared to the response of a bridge with seismic isolation.

Long-Term Behavior of Integral Abutment Bridges
Long-Term Behavior of Integral Abutment Bridges

Author: Robert J. Frosch

Publisher: Joint Transportation Research Program

Published: 2011-08-15

Total Pages: 149

ISBN-13: 9781622600120

DOWNLOAD EBOOK

Integral abutment (IA) construction has become the preferred method over conventional construction for use with typical highway bridges. However, the use of these structures is limited due to state mandated length and skew limitations. To expand their applicability, studies were implemented to define limitations supported by rational analysis rather than simply engineering judgment. Previous research investigations have resulted in larger length limits and an overall better understanding of these structures. However, questions still remain regarding IA behavior; specifically questions regarding long-term behavior and effects of skew. To better define the behavior of these structures, a study was implemented to specifically investigate the long term behavior of IA bridges. First, a field monitoring program was implemented to observe and understand the in-service behavior of three integral abutment bridges. The results of the field investigation were used to develop and calibrate analytical models that adequately capture the long-term behavior. Second, a single-span, quarter-scale integral abutment bridge was constructed and tested to provide insight on the behavior of highly skewed structures. From the acquired knowledge from both the field and laboratory investigations, a parametric analysis was conducted to characterize the effects of a broad range of parameters on the behavior of integral abutment bridges. This study develops an improved understanding of the overall behavior of IA bridges. Based on the results of this study, modified length and skew limitations for integral abutment bridge are proposed. In addition, modeling recommendations and guidelines have been developed to aid designers and facilitate the increased use of integral abutment bridges.

Recent Advances in Earthquake Engineering
Recent Advances in Earthquake Engineering

Author: Sreevalsa Kolathayar

Publisher: Springer Nature

Published: 2021-09-20

Total Pages: 528

ISBN-13: 9811646171

DOWNLOAD EBOOK

This book presents the select proceedings of the Virtual Conference on Disaster Risk Reduction (VCDRR 2021). It emphasizes on the role of civil engineering for a disaster-resilient society. It presents latest research in geohazards and their mitigation. Various topics covered in this book are earthquake hazard, seismic response of structures and earthquake risk. This book is a comprehensive volume on disaster risk reduction (DRR) and its management for a sustainable built environment. This book will be useful for the students, researchers, policy makers and professionals working in the area of civil engineering and earthquake engineering.

Steel Girder-concrete Column Integral Bridges for Seismic Regions
Steel Girder-concrete Column Integral Bridges for Seismic Regions

Author: Justin R. Vander Werff

Publisher:

Published: 2002

Total Pages: 368

ISBN-13:

DOWNLOAD EBOOK

Bridges with integral connections exhibit improved seismic performance and are useful in providing increased clearances. Integral bridges with steel girders are feasible and provide decreased seismic mass to further enhance seismic performance. However, most bridges in seismic regions that have been built with integral connections have been designed with concrete superstructures and concrete cap beams, and most of the research that has been conducted on integral connections for seismic regions has also dealt with concrete cap and girder sections. For this reason, the National Cooperative Highway Research Program has funded a project investigating the performance of concrete columns and steel superstructures in integral pier bridges under seismic loading. The focus of the project involved the development of a prototype bridge, investigation of suitable connection details and optimum member dimensions, load distribution in the structure, and overall seismic performance. These areas were examined using a combination of analytical and experimental studies. The prototype bridge developed in this study consists of a concrete column; steel, box-shaped cap beam; and steel girders. Two one-third-scale test specimens were developed, constructed, and tested as part of the experimental investigation. Grillage analyses of the prototype structure and test specimens were developed to work out appropriate loading for the specimens, to analyze the load distribution in the structures, and to develop predicted responses for the test specimens. The design of the first test specimen was governed by geometrical constraints based on the necessary depth to provide adequate anchorage length for the column longitudinal reinforcement. The second test specimen was designed to optimize the efficiency of the superstructure by using mechanical anchorage for the column longitudinal reinforcement, allowing the use of a shallower cap beam and lighter girder sections. Both test specimens exhibited satisfactory seismic performance by developing plastic hinges in the columns and successfully retaining strength under inelastic deformations.