Lead-rubber-bearing with negative stiffness springs (LRB-NS) for base-isolation seismic design of resilient bridges: A theoretical feasibility study
Lead-rubber-bearing with negative stiffness springs (LRB-NS) for base-isolation seismic design of resilient bridges: A theoretical feasibility study
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用于弹性桥梁基础隔震抗震设计的负刚度弹簧铅橡胶支座（LRB-NS）：理论可行性研究
DOI：
10.1016/j.engstruct.2022.114601
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发表时间：
2022-09
影响因子：
5.5
通讯作者：
Xiaowei Wang
中科院分区：
文献类型：
--
作者：
Xu Chen;Kohju Ikago;Zhongguo Guan;Jianzhong Li;Xiaowei Wang
•开发了一种新型LRB- ns系统，以提高桥梁LRB的基隔振效率。•对NS-LRB系统行为进行了理论推导。•提供了LRB-NS系统的力学、动态特性和设计过程。•NS弹簧在轻微和严重激励下显示双重功能。•LRB-NS可以提高基础隔离桥的系统级性能。先进的隔震装置和系统已被认为是桥梁结构弹性设计的有前途的措施。本文提出了一种由传统铅橡胶支座（LRB）和预压缩弹簧组成的桥柱底部负刚度弹簧铅橡胶支座（LRB- ns）基础隔震系统。这些弹簧具有双重功能：(1)在轻微震动时提供负刚度（NS）和负恢复力，并延长由LRB产品决定的结构周期；(2)提供显著的恢复力，以防止过大的峰值变形，并保护轴承在遭受强震时免受破坏。首先进行了理论和分析研究，以说明所提出的LRB-NS装置的基本力学，然后进行了一系列参数分析，以了解该装置对结构行为的影响因素。此外，通过对典型公路桥梁的易损性分析，通过与非隔离和传统LRB系统的比较，证明了LRB- ns装置的可行性。结果表明，LRB- ns装置可以很好地减轻桥柱的抗震要求，并能有效地抑制传统LRB系统在强激励下经常出现的轴承过度变形。LRB-NS装置可用于桥梁结构的抗震设计。
• A novel LRB-NS system is developed to improve the base-isolation efficiency of LRB for bridges. • Theoretical deduction of NS-LRB system behavior is performed. • Mechanics, dynamic properties, and design procedure of LRB-NS system are provided. • NS springs show dual functionalities under slight and severe excitations. • LRB-NS can improve the system-level performance of base-isolated bridges. Advanced seismic isolation devices and systems have been recognized as promising measures toward resilient design of bridge structures. This paper proposes a base isolation system using lead rubber bearing with negative stiffness springs (LRB-NS), which is composed of traditional lead rubber bearing (LRB) and pre-compressed springs, installed at the bottom of bridge columns. These springs contain dual functionalities: (1) provide negative stiffness (NS) and negative restoring force during slight shakings and elongate the structural period that is determined by LRB products; and (2) offer significant restoring forces to prohibit excessive peak deformation and protect bearings from failure when subjected to strong earthquakes. Theoretical and analytical studies are first conducted to illustrate fundamental mechanics of the proposed LRB-NS device, followed by a series of parametric analyses to understand the influential factors of this device on structural behavior. Moreover, fragility analyses of typical highway bridges are conducted to demonstrate the feasibility of LRB-NS device via comparisons with non-isolated and traditional LRB systems. The results show that the LRB-NS device can be well designed to mitigate seismic demands of bridge columns, as well as highly effective to suppress the excessive deformation in bearings that often occurs in the traditional LRB system under strong excitations. The LRB-NS device can be used to facilitate the resilient seismic design of bridge structures.
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影响因子：
4.5
作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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