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Seismic Retrofit of Highway Bridge Structures
The California Division of Structures began its column retrofit program in 1986. This program is a supplement to the earlier superstructure retrofit program. Analysis and design concepts...

San Francisco Double-Deck Viaduct Retrofits
Following the Loma Prieta Earthquake in October 1989, six double-deck reinforced concrete viaducts in San Francisco were closed because of some isolated damage, and as a precaution for...

Retrofitting Northwest Connector for Seismic Forces
Many pre-1971 bridges in California have inadequate seismic resistance due to non-ductile components or poor connectivity of superstructure elements. Caltrans has finished the first retrofit...

Lifeline Design of Bridges
An analysis and design procedure is presented for retrofitting steel girder bridges that may experience the loss of a pier or column. Multispan and continuous grider bridges are treated....

Bridge Seismic Retrofit Prioritization
This paper describes a mathematical model developed to produce an index by which bridges in a network can be prioritized systematically for seismic retrofitting. The model incorporates...

Screening Procedures for the Retrofit of Bridges
Since the October 1989 Loma Prieta Earthquake in Northern California, interest has revived in seismic criteria for both new design and the retrofit of existing highway bridges. This interest...

Response of Ductile Iron Pipelines at Parkfield, CA to Loma Prieta Earthquake
A field experiment designed to investigate the performance of buried pipelines at a fault crossing has been constructed at Owens' Pasture near Parkfield, CA. The site was...

Scenario for Improving the Seismic Resistance of Pipelines in the Central United States
A number of pipelines transporting crude oil and natural gas to the Midwest and Northeast pass within and adjacent to the New Madrid seismic zone in the central United States. A major...

Seismic/Geologic Risks as Factors in Prioritizing Gas Pipeline System Replacement
During the past decade, Pacific Gas and Electric Company (PG&E) has intensified efforts to evaluate earthquake hazards and their potential effects on gas and electric power systems,...

Regional Risk Assessment of Environmental Contamination from Oil Pipelines
This paper presents a methodology for assessing the risk of environmental contamination from oil pipeline leaks due to earthquakes. Risk is measured both as volume of oil released and...

Tension Bending Behavior of Buried Pipelines Under Large Ground Deformations in Active Faults
This paper deals with the tensile failure of buried pipelines subject to abrupt fault movements. The pipe is modeled as a thin cylindrical shell which is essentially semi-infinite. The...

Seismic Behavior of Buried Pipelines Through Field Observation
This paper presents seismic response characteristics of embedded pipes based on field measurements. Strains induced in steel pipe and ductile pipes with expansion joints are studied. Special...

Seismic Hazard Along a Crude Oil Pipeline in the Event of an 1811-1812 Type New Madrid Earthquake
This paper presents an assessment of the seismic hazard that exists along a major crude oil pipeline (pipeline 22). An 1811-1812 type New Madrid earthquake with moment magnitude 8.2 is...

Seismic Design Practices for Power Systems: Evolution, Evaluation, and Needs
The evolution of seismic design practices in electric power systems is reviewed. In California this evolution had led to many installation practices that are directed at improving the...

First Experience Concerning the Seismic Behaviour of an Electric Power System in Eastern North America
The November 25, 1988, Saguenay earthquake of magnitude M_bL_g=6.5 occurred in the province of Quebec, Canada....

Aseismic Calculations for Transmission Towers
In this paper, mechanical models for long-span transmission line systems under elastic and gravitational restoring forces are established in three different directions; this continues...

Design of Substation Foundations for Liquefaction
When substation foundations penetrate liquefiable strata within risk prone seismic regions, the potential loss of support must be evaluated with state-of-the-art methods to determine foundation...

Earthquake Evaluation of a Substation Network
The impact of the occurrence of a large, damaging earthquake on a regional electric power system is a function of the geographical distribution of strong shaking, the vulnerability of...

Two Decades of Communications Systems Seismic Protection Improvements
Telecommunications systems in North America have gone through significant technology changes in the past twenty years. The electro-mechanical switching equipment has been replaced by electronic...

A Study of Shield Tunnel's Earthquake Prevention Under a Big Earthquake
Currently, the most commonly used approach for determining the aseismicity of a shield tunnel is the 'Response Displacement Method.' This is based on analysed...

 

 

 

 

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