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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Low cyclic fatigue and hysteretic behavior of U-shaped steel dampers for seismically isolated buildings under dynamic cyclic loadings
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Low cyclic fatigue and hysteretic behavior of U-shaped steel dampers for seismically isolated buildings under dynamic cyclic loadings

机译：U形钢制阻尼器在动态循环载荷下的低周期性疲劳和滞后性能

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摘要

Energy dissipation devices are necessary for base-isolated buildings to control the deformation in the isolation system and to dissipate the earthquake-induced energy. U-shaped steel dampers (also known as U-dampers) dissipate energy through plastic deformation of specially designed U-shaped steel elements. This type of device can be installed at several locations in the isolation system. U-dampers have been widely used in Japan for different types of isolated structures, such as hospitals, plants and residential buildings, since the 1995 Kobe Earthquake. Previous research has used static tests to estimate the performance of U-dampers. However, the ultimate plastic deformation capacities and hysteretic behaviors of full-scale U-dampers under dynamic excitations still remain unclear. In addition, it is unclear whether the initial temperature has an effect on the hysteretic behavior and plastic deformation capacity of U-dampers. In this paper, two series of dynamic loading tests of U-dampers were conducted to evaluate the issues described earlier. The major findings of the study are (i) the loading speed has little effect on the plastic deformation capacity of U-dampers; (ii) method to evaluate the ultimate plastic deformation capacities of U-shaped steel dampers of different sizes is established using a Manson-Coffin relation-based equation that is based on the peak-to-peak horizontal shear angle (t), which is defined as the lateral deformation amplitude (peak-to-peak amplitude) divided by the height of the dampers; (iii) the loading rate and the initial temperature have a minimal effect on the hysteretic behavior of the U-dampers; and (iv) a bilinear model is proposed to simulate the force-deformation relationships of the U-dampers. Copyright (c) 2014 John Wiley & Sons, Ltd.
机译：隔震建筑对于控制隔震系统中的变形并消散地震诱发的能量是必不可少的。 U型钢阻尼器（也称为U型阻尼器）通过专门设计的U型钢元件的塑性变形来耗散能量。这种类型的设备可以安装在隔离系统中的多个位置。自1995年神户地震以来，U型阻尼器在日本已广泛用于各种类型的隔离结构，例如医院，工厂和住宅建筑。先前的研究已使用静态测试来估计U型阻尼器的性能。然而，在动力激励下，全尺寸U型阻尼器的极限塑性变形能力和滞后行为仍然不清楚。另外，还不清楚初始温度是否对U型阻尼器的滞后行为和塑性变形能力有影响。在本文中，对U型阻尼器进行了两个系列的动态载荷测试，以评估前面所述的问题。该研究的主要发现是：（i）加载速度对U型阻尼器的塑性变形能力影响很小； （ii）使用基于峰-峰水平剪切角（t）的基于曼森-科芬（Manson-Coffin）关系的方程式建立评估不同尺寸U型钢阻尼器极限塑性变形能力的方法定义为横向变形幅度（峰到峰幅度）除以阻尼器的高度； （iii）加载速率和初始温度对U型阻尼器的滞后性能影响最小； （iv）提出了一个双线性模型来模拟U型阻尼器的力-变形关系。版权所有（c）2014 John Wiley＆Sons，Ltd.

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