Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Practical Solutions for the Seismic Retrofit of the Steel Towers and the Deck Hinges of the San Mateo-Hayward Bridge
This paper reviews a number of practical and innovative solutions for the seismic retrofit of the steel towers and the deck hinges of the San Mateo-Hayward Bridge. Emphasis is put on the interrelationship between the concept, design and detailing development steps and the importance of addressing constructibility issues during all these steps. The seismic retrofit strategy for the steel towers of the bridge was to increase their overall ductility and to achieve a desirable distribution of strength and stiffness based on failure mode criteria. One of the important retrofit measures used was the addition of anchor bolts at the tower base connection to increase connection strength, ductility and redundancy. The new anchor bolt connection assemblies included a lower yield steel bar above the column base plate to control the location of yielding, and a steel sleeve around the bar to improve rocking behavior by forcing the bars to resist compression if they have previously experienced tension yielding. They were detailed to fit within the limited clearance between the existing anchor bolts. Another cost-effective measure for improving tower base behavior was the addition of a concrete fill at the base of the columns. The retrofit of the deck hinges presented a special challenge in view of their inherent vulnerabilities, high and uncertain seismic demands and clearance constraints, and the need to maintain movement capacity. To limit excessive hinge openings, a relatively simple high capacity longitudinal rod restrainer system that used conventional marine type fender units was developed. It was found that well defined performance and retrofit criteria along with retrofit concepts and details compatible with the existing bridge configuration, easily constructible, and with ample tolerances can have a significant impact on the cost and the effectiveness of the retrofit.
Practical Solutions for the Seismic Retrofit of the Steel Towers and the Deck Hinges of the San Mateo-Hayward Bridge
This paper reviews a number of practical and innovative solutions for the seismic retrofit of the steel towers and the deck hinges of the San Mateo-Hayward Bridge. Emphasis is put on the interrelationship between the concept, design and detailing development steps and the importance of addressing constructibility issues during all these steps. The seismic retrofit strategy for the steel towers of the bridge was to increase their overall ductility and to achieve a desirable distribution of strength and stiffness based on failure mode criteria. One of the important retrofit measures used was the addition of anchor bolts at the tower base connection to increase connection strength, ductility and redundancy. The new anchor bolt connection assemblies included a lower yield steel bar above the column base plate to control the location of yielding, and a steel sleeve around the bar to improve rocking behavior by forcing the bars to resist compression if they have previously experienced tension yielding. They were detailed to fit within the limited clearance between the existing anchor bolts. Another cost-effective measure for improving tower base behavior was the addition of a concrete fill at the base of the columns. The retrofit of the deck hinges presented a special challenge in view of their inherent vulnerabilities, high and uncertain seismic demands and clearance constraints, and the need to maintain movement capacity. To limit excessive hinge openings, a relatively simple high capacity longitudinal rod restrainer system that used conventional marine type fender units was developed. It was found that well defined performance and retrofit criteria along with retrofit concepts and details compatible with the existing bridge configuration, easily constructible, and with ample tolerances can have a significant impact on the cost and the effectiveness of the retrofit.
Practical Solutions for the Seismic Retrofit of the Steel Towers and the Deck Hinges of the San Mateo-Hayward Bridge
Prucz, Zolan (Autor:in) / Conway, William B. (Autor:in) / Schade, Jason E. (Autor:in) / Ouyang, Yu (Autor:in)
Structures Congress 2000 ; 2000 ; Philadelphia, Pennsylvania, United States
27.04.2000
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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