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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Design of hysteretic dampers with optimal ductility for the transverse seismic control of cable-stayed bridges
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Design of hysteretic dampers with optimal ductility for the transverse seismic control of cable-stayed bridges

机译：具有最佳延性的滞后阻尼器设计，用于斜拉桥的横向地震控制

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摘要

Cable-stayed bridges require a careful consideration of the lateral force exerted by the deck on the towers under strong earthquakes. This work explores the seismic response of cable-stayed bridges with yielding metallic dampers composed of triangular plates that connect the deck with the supports in the transverse direction. A design method based on an equivalent single-degree of freedom approximation is proposed. This is proved valid for conventional cable-stayed bridges with 200- and 400-m main spans, but not 600m. The height of the plates is chosen to (1) achieve a yielding capacity that limits the maximum force transmitted from the deck to the towers, and to (2) control the hysteretic energy that the dampers dissipate by defining their design ductility. In order to select the optimal ductility and the damper configuration, a multi-objective response factor that accounts for the energy dissipation, peak damper displacement and low-cycle fatigue is introduced. The design method is applied to cable-stayed bridges with different spans and deck-support connections. The results show that the dissipation by plastic deformation in the dampers prevents significant damage in the towers of the short-to-medium-span bridges under the extreme seismic actions. However, the transverse response of the towers in the bridge with a 600-m main span is less sensitive to the dampers. Copyright (c) 2017 John Wiley & Sons, Ltd.
机译：斜拉桥需要仔细考虑在强烈地震下甲板对塔架施加的侧向力。这项工作探索了斜拉桥的地震响应，该斜拉桥由屈服的金属减震器组成，该减震器由三角形板组成，这些三角形板将甲板与支撑物横向连接。提出了一种基于等效单自由度近似的设计方法。事实证明，这对主跨度为200和400 m的常规斜拉桥有效，但对600m无效。选择板的高度是为了（1）达到限制从甲板传递到塔架的最大力的屈服能力，并（2）通过定义阻尼器的设计延展性来控制阻尼器消散的滞后能量。为了选择最佳的延展性和阻尼器配置，引入了一个多目标响应因子，该因子考虑了能量耗散，峰值阻尼器位移和低周疲劳。该设计方法适用于不同跨度和桥面支撑连接的斜拉桥。结果表明，在极端地震作用下，减震器中塑性变形造成的耗散可防止中短跨度桥梁的塔架受到重大破坏。但是，主跨度为600 m的桥梁中塔的横向响应对阻尼器的敏感性较小。版权所有（c）2017 John Wiley＆Sons，Ltd.

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