IMPROVED SEISMIC DESIGN CRITERIA FOR CALIFORNIA BRIDGES: PROVISIONAL RECOMMENDATIONS

Published on Jun 30, 1996
R V Nutt1
Estimated H-index: 1
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Abstract null null The simplified modeling and analysis procedures commonly used in the design and assessment of bridges utilize one-dimensional (1D) spine elements and springs. These procedures have been well vetted for columns and some capacity-protected members, such as the girders. However, the abutment also contributes to the lateral load resisting system, and the simplified models may not capture the actual load path, failure modes, or dynamic response of either the bridge system or the ab...
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Abstract Pile foundations, especially partially embedded in soils, are vulnerable parts of bridges under seismic loadings. In this study, to investigate seismic failure mechanisms of partially-embedded reinforced concrete (RC) pile-group foundations, a series of quasi-static cyclic loading tests were conducted on 1 × 1, 2 × 2 and 2 × 3 pile-foundation specimens in sand. Observed hysteretic behavior and pile damage were recorded, along with pile curvature distributions. Then, numerical models bas...
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Abstract An external restraining system which is anchoring the bridge superstructure to the embankment backfill is proposed in this study for the seismic protection of isolated bridges. The restraining system is employed to reduce the seismic demands of the bridge deck by utilising the otherwise inactive ground behind the abutment back-walls. The system can be described as fastening the bridge end-diaphragms to the rocky strata that lie beneath the abutment backfill. The anchoring is achieved th...
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The purpose of this study is to assess the structural performance of hollow bridge columns with triangular confining reinforcement. The proposed triangular reinforcement details were equal to the c...
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Across Europe, the need to manage roadway bridges efficiently led to the development of multiple management systems in different countries. Despite presenting similar architectural frameworks, there are relevant differences among them regarding condition assessment procedures, performance goals and others. Therefore, although existing a complete freedom of traffic between countries, this dissimilarity constitutes a divergent mechanism that has direct interference in the decision making process l...
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Bridges can be subjected to damaging environmental actions due to flooding and seismic hazards. Flood actions that result in scour are a leading cause of bridge failure, while seismic actions that induce lateral forces may lead to high ductility demand that exceeds pier capacity. When combined, seismic actions and scour can lead to effects that depend on the governing scour condition affecting a bridge. Loss of stiffness under scour can reduce the ductility capacity of a bridge but can also lead...
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AbstractNon-linear time-history analysis is the most reliable method to evaluate the responses of bridges subjected to seismic loads. Canadian Highway Bridge Design Code, American Association State Highway and Transportation Officials require using spectrum-compatible accelerograms for time-history analysis. This paper presents four methods for obtaining spectrum-compatible accelerograms for time-history analysis of bridges in eastern Canada where real earthquake records are lacking. Based on th...
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