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首页> 外文会议>International Structural Engineering and Construction Conference(ISEC-03); 20050920-23; Shunan(JP) >Historic three-hinge concrete arch bridge seismic retrofit
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Historic three-hinge concrete arch bridge seismic retrofit

机译：历史悠久的三铰混凝土拱桥抗震改造

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摘要

North Main Street Bridge over the Los Angeles River located within the City of Los Angeles, California, was built in 1910 and was identified as the first three-hinge concrete arch rib bridge constructed in the southwestern United States. The bridge is located within 4 kilometers from the Elysian Park Blind/Thrust fault with an estimated Maximum Credible Earthquake (MCE) magnitude of 7.0 and peak bedrock acceleration of 0.55 g. Multi-modal seismic analysis was performed. The analysis results indicated that the bridge is unstable under seismic loads and the arch ribs and spandrel columns do not have adequate capacities to carry the seismic force demands induced by the MCE event. A retrofit strategy which prevents the bridge from collapsing under the MCE event was developed. The retrofit strategy has minimum adverse effects on the historic character defining features of the bridge.
机译：位于加利福尼亚洛杉矶市内的洛杉矶河北大街桥始建于1910年，被认为是美国西南部建造的第一座三铰混凝土拱肋桥。这座桥位于距Elysian Park Blind / Thrust断层4公里之内，估计的最大可信地震（MCE）大小为7.0，峰值基岩加速度为0.55 g。进行了多模式地震分析。分析结果表明，桥梁在地震荷载作用下是不稳定的，拱肋和跨度柱没有足够的承载力来承受由MCE事件引起的地震力需求。制定了防止在MCE事件下桥梁坍塌的改型策略。翻新策略对桥梁的历史特征具有最小的负面影响。

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