粘性阻尼器自定心墙在脉冲激励下的摇摆响应

IF 1.4 4区工程技术 Q3 ENGINEERING, CIVIL

Earthquakes and Structures Pub Date : 2020-09-01 DOI:10.12989/EAS.2020.19.3.215

Lingxin Zhang, Xiaogang Huang, Zhen Zhou

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引用次数: 2

摘要

自定心墙（SCW）是一种抗侧向摇摆系统，它包含后张（PT）钢筋束，以提供自定心能力和阻尼器来耗散能量。本文研究了带基底粘性阻尼器的SCW在正弦型脉冲作用下的摇摆响应，考虑了PT筋的屈服和断裂行为。用理论方法计算了PT筋中不同初始力引起的倾覆加速度的差异。还为细长SCW的线性近似运动方程提供了精确的解析解。最后，分析了PT筋的延性行为对SCW摇摆响应的影响。结果表明，SCW在脉冲激励下表现出两种翻转模式。PT力情况下模式1的倾覆区域将墙的安全区域分为两部分：具有弹性肌腱的区域S1和具有断裂肌腱的区域S2。具有弹脆性钢筋束的SCW的最小倾覆加速度随着PT力的增加而对激励频率不敏感。在考虑PT钢筋束的塑性行为后，SCW的最小倾覆加速度在所研究的wg/p的整个范围内显著增加

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Rocking response of self-centring wall with viscous dampersunder pulse-type excitations

self-centering wall (SCW) is a lateral resistant rocking system that incorporates posttensioned (PT) tendons to provide a self-centering capacity along with dampers to dissipate energy. This paper investigates the rocking responses of a SCW with base viscous dampers under a sinusoidal-type pulse considering yielding and fracture behaviour of the PT tendon. The differences in the overturning acceleration caused by different initial forces in the PT tendon are computed by the theoretical method. The exact analytical solution to the linear approximate equation of motion is also provided for slender SCWs. Finally, the effects of the ductile behaviour of PT tendons on the rocking response of a SCW are analysed. The results demonstrate that SCWs exhibit two overturning modes under pulse excitation. The overturning region with Mode 1 in the PT force cases separates the safe region of the wall into two parts: region S1 with an elastic tendon and region S2 with a fractured tendon. The minimum overturning acceleration of a SCW with an elastic-brittle tendon becomes insensitive to excitation frequency as the PT force increases. After the plastic behaviour of the PT tendon is considered, the minimum overturning acceleration of a SCW is increased significantly in the whole range of the studied wg/p

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来源期刊

Earthquakes and Structures ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL

CiteScore

2.90

自引率

20.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Earthquakes and Structures, An International Journal, focuses on the effects of earthquakes on civil engineering structures. The journal will serve as a powerful repository of technical information and will provide a highimpact publication platform for the global community of researchers in the traditional, as well as emerging, subdisciplines of the broader earthquake engineering field. Specifically, some of the major topics covered by the Journal include: .. characterization of strong ground motions, .. quantification of earthquake demand and structural capacity, .. design of earthquake resistant structures and foundations, .. experimental and computational methods, .. seismic regulations and building codes, .. seismic hazard assessment, .. seismic risk mitigation, .. site effects and soil-structure interaction, .. assessment, repair and strengthening of existing structures, including historic structures and monuments, and .. emerging technologies including passive control technologies, structural monitoring systems, and cyberinfrastructure tools for seismic data management, experimental applications, early warning and response