Overturning of Retrofitted Rocking Structures under Pulse-Type Excitations
Overturning of Retrofitted Rocking Structures under Pulse-Type Excitations
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DOI：
10.1061/(asce)em.1943-7889.0000410
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发表时间：
2012-08
期刊：
影响因子：
--
通讯作者：
E. Dimitrakopoulos;M. DeJong
中科院分区：
文献类型：
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作者：
E. Dimitrakopoulos;M. DeJong
摘要许多现有结构在地震中表现出摇晃行为，并且需要对这些结构进行改造以防止倒塌。此外，虽然通常是防止而不是利用摇摆行为，但越来越多的结构正在设计或改造，以允许摇摆运动作为隔震手段。本文通过分析建模来描述阻尼摇摆结构的基本行为，研究了使用粘性阻尼来限制摇摆运动的方法。采用单块摇块分析模型确定粘滞阻尼特性，利用摇块运动的有利方面，同时耗散能量，防止倾覆坍塌。为了阐明阻尼的好处，提出了脉冲型地面加速度的倾覆包络，并与自由摇摆块的相关包络进行了比较。线性化运动方程的半解析解使…
AbstractNumerous existing structures exhibit rocking behavior during earthquakes, and there is a continuing need to retrofit these structures to prevent collapse. In addition, while rocking behavior is typically prevented instead of utilized, an increasing number of structures are being designed or retrofitted to allow rocking motion as a means of seismic isolation. This paper investigates the use of viscous damping to limit the rocking motion by characterizing the fundamental behavior of damped rocking structures through analytical modeling. A single rocking block analytical model is used to determine the viscous damping characteristics, which exploit the beneficial aspects of the rocking motion, while dissipating energy and preventing overturning collapse. To clarify the benefits of damping, overturning envelopes for pulse-type ground accelerations are presented and compared with the pertinent envelopes of the free rocking block. A semianalytical solution to the linearized equations of motion enables ra...