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Seismic response of steel structures with seesaw systems using viscoelastic dampers

机译：带有粘弹性阻尼器的跷跷板系统对钢结构的地震响应

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摘要

Vibration control systems are being used increasingly worldwide to provide enhanced seismic protection for new and retrofitted buildings. This paper presents a new vibration control system on the basis of a seesaw mechanism with viscoelastic dampers. The proposed vibration control system comprises three parts: brace, seesaw member, and viscoelastic dampers. In this system, only tensile force appears in bracing members. Consequently, the brace buckling problem is negligible, which enables the use of steel rods for bracing members. By introducing pre-tension in rods, long steel rods are applicable as bracing between the seesaw members and the moment frame connections over some stories. Seesaw mechanisms can magnify the damper deformation according to the damper system configuration. In this paper, first, the magnification factor, that is, the ratio of the damper deformation to the story drift, is delivered, which includes the rod deformation. Results of a case study demonstrate that the magnification factor of the proposed system is greater than unity for some cases. Seismic response analysis is conducted for steel moment frames with the proposed vibration control system. Energy dissipation characteristics are examined using the time-history response results of energy. The maximum story drift angle distributions and time-history response results of displacement show that the proposed system can reduce the seismic response of the frames effectively.
机译：振动控制系统在世界范围内越来越多地用于为新建和翻新建筑物提供增强的抗震保护。本文提出了一种新的基于粘弹性阻尼器的跷跷板振动控制系统。拟议的振动控制系统包括三部分：支撑，跷跷板构件和粘弹性阻尼器。在该系统中，仅拉力出现在支撑构件中。因此，支撑屈曲问题可忽略不计，这使得能够使用钢杆来支撑构件。通过在杆中引入预拉力，可以将长钢杆用作跷跷板构件和某些楼层的弯矩框架连接件之间的支撑。跷跷板机构可以根据阻尼器系统配置来放大阻尼器变形。在本文中，首先，传递放大系数，即阻尼器变形与层间位移的比率，其中包括杆变形。案例研究的结果表明，在某些情况下，建议系统的放大倍数大于1。利用所提出的振动控制系统对钢制框架进行了地震反应分析。使用能量的时间历史响应结果检查能量耗散特性。最大层间位移角分布和位移的时程响应结果表明，所提出的系统可以有效降低框架的地震响应。

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