Design of hysteretic dampers with optimal ductility for the transverse seismic control of cable‐stayed bridges
Design of hysteretic dampers with optimal ductility for the transverse seismic control of cable‐stayed bridges
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DOI：
10.1002/eqe.2884
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发表时间：
2017-03
影响因子：
4.5
通讯作者：
A. Camara;Roberto Cristantielli;M. Astiz;C. Málaga‐Chuquitaype
中科院分区：
文献类型：
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作者：
A. Camara;Roberto Cristantielli;M. Astiz;C. Málaga‐Chuquitaype
斜拉桥需要仔细考虑在强烈地震下桥面板施加在塔上的横向力。本工作探讨斜拉桥的地震反应与屈服金属阻尼器组成的三角形板连接的桥面与支持在横向方向。提出了一种基于等效单自由度近似的设计方法。对于主跨为200 m和400 m的传统斜拉桥，这一点被证明是有效的，但对于主跨为600 m的斜拉桥，这一点则不适用。选择板的高度以（1）实现限制从桥面传递到塔架的最大力的屈服能力，以及（2）通过限定阻尼器的设计延性来控制阻尼器耗散的滞后能量。为了选择最佳的延性和阻尼器配置，引入了一个多目标响应系数，该系数考虑了能量耗散、阻尼器峰值位移和低周疲劳。该设计方法适用于不同跨度和桥面支座连接的斜拉桥。结果表明，阻尼器中的塑性变形耗散防止在极端地震作用下的短到中等跨度桥梁的塔的显着损坏。然而，主跨为600 m的桥梁中桥塔的横向响应对阻尼器不太敏感。版权所有© 2017约翰威利父子有限公司
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 600 m. 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 © 2017 John Wiley & Sons, Ltd.