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首页> 美国政府科技报告 >Independent seismic evaluation of the 24-580-980 south connector ramps response to the south connector ramps to a magnitude 7.25 Hayward Fault earthquake. Volume 3
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Independent seismic evaluation of the 24-580-980 south connector ramps response to the south connector ramps to a magnitude 7.25 Hayward Fault earthquake. Volume 3

机译：独立的地震评估24-580-980南连接器斜坡响应南连接器斜坡上升到7.25海沃德断层地震。第3卷

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摘要

The 24/580/980 interchange is located near Oakland California on the Eastern perimeter of the San Francisco Bay. This interchange is a major artery in the Eastern San Francisco Bay area and provides a critical link between major bay area highways. The main Concord line of the Bay Area Rapid Transit System (BART), with ridership of approximately 270,000 per day, runs underneath the interchange. The interchange site is approximately 4 Km from the Hayward fault and 16 Km from the San Andreas fault. The reinforced concrete interchange was designed and constructed in the mid 1960's and thus the asphalt structure has many of the vulnerabilities associated with typical pre-1970's concrete structures, Caltrans engineers, working together with their external consultants Imbsen and Associates, have recently completed a seismic retrofit design for portions of the interchange. The retrofit is primarily intended to fix inadequacies in many of the 1960's vintage reinforced concrete elements which constitute the bridge superstructure and foundations.

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