Computer modeling of dynamic behavior of rocking wall structures including the impact-related effects
Computer modeling of dynamic behavior of rocking wall structures including the impact-related effects
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DOI：
10.1177/1369433216642057
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发表时间：
2016-04
影响因子：
2.6
通讯作者：
I. M. Qureshi;P. Warnitchai
中科院分区：
文献类型：
--
作者：
I. M. Qureshi;P. Warnitchai
预制后张法混凝土摇摆墙体系是一种创新的地震区结构防损体系。以往关于摇摆墙体动力性能的实验工作已经发现，在墙基与基础的碰撞过程中，在横向和竖向上都存在高频加速度尖峰。这些加速度峰值共同作用，可能导致墙体-基础连接处的剪切滑移。这项研究的重点是开发一种计算机模型，可以预测这些加速度峰值，并识别它们对摇摆墙动态性能的影响。为此，对墙体-基础连接处的冲击现象进行了详细的讨论，并对冲击或接触建模的两个重要参数--接触刚度和接触阻尼--提出了一些一般性的准则。基于所提出的准则的有限元数值模型被发现能够非常有效地预测随加速度峰值的摇摆墙的整体动力行为。研究发现，加速度尖峰与碰撞时的横向速度和初始接触刚度有关。因此，采用与速度相关的耗能装置和软接触是适合于减小这些影响的。
Precast post-tensioned concrete rocking wall system is an innovative damage avoidance structural system for seismic regions. Past experimental works on the dynamic performance of rocking walls have identified the presence of high-frequency acceleration spikes in both lateral and vertical directions during the impact of wall base with the foundation. These acceleration spikes, acting together, can cause shear slip at the wall–foundation connection. This study is focused on the development of a computer model that can predict these acceleration spikes along with the identification of their effects on the dynamic performance of rocking walls. For this purpose, impact phenomenon at the wall–foundation joint has been discussed in detail and some general guidelines are set for the two important parameters of impact or contact modeling named as contact stiffness and contact damping. The finite element numerical models, based on the proposed guidelines, are found to predict the overall dynamic behavior of rocking walls along with the acceleration spikes quite efficiently. The acceleration spikes are found to be dependent on the lateral velocity at impact and the initial contact stiffness. So a velocity-dependent energy dissipation device along with a soft contact is found to be suitable for reducing these effects.