Seismic Deflection Response of Vibration Control Structures and the Optical Fiber Sensing

近年来，许多结构被动控制系统被证明可以减小地震作用下的反应，并逐渐应用于建筑中。作者开发了一种新型的非结构弯曲屈服梁被动控制系统，并将该系统应用于六层办公楼。该控制系统目前的概念是由两种非结构钢构件组成，一种是支撑，另一种是水平构件，即短跨度梁。在摇摆运动中，这种非结构弯曲屈服梁的弯曲应变大于结构构件的弯曲应变。因此，这种非结构受弯屈服梁的屈服时间要早于结构梁或柱，并通过其滞回性能起到阻尼器的减震作用。在我们以前的论文中，在振动台上的试验模型在正弦和随机波动作用下的基本动力响应是通过实验和并行的…演示的利用该系统对钢结构建筑进行了较多的地震反应分析，该系统所需专用设备有限，对建筑规划影响不大。此外，由于光纤Bragg光栅传感器安装在非结构弯曲屈服梁上，即使在任何地震后，该系统的破坏程度也已被评估。为了进行实际设计，有必要使用大型试件来确认与安装该系统相关的各种细节。本研究以大型钢框架试件为研究对象，进行静力循环加载试验。结果表明，试验结果与理想化的理论模型是一致的。讨论了非结构弯曲屈服梁(阻尼梁)的刚度、强度和尺寸对等效阻尼器阻尼系数和弹塑性滞回吸收能量的影响。讨论了弯曲破坏梁作为阻尼器的形状和尺寸对弹塑性滞回性能的影响。在光束表面安装了光纤布拉格光栅传感器，并成功地测量了其输出的光功率谱和应变量。结果表明，由于钢的屈服，谱线由尖锐的单峰型转变为多峰型。这些特征对评估大地震后的震害程度具有一定的参考价值。较少

Recently, many structural passive control systems have been demonstrated to reduce the response during an earthquake and have gradually been applied to buildings. The authors developed new passive control system using a non-structural flexural yielding beam and the system was recently applied to the six-story office building. The present concept of this control system consists of two kinds of non-structural steel members the one is a brace and the other is of horizontal members, the short span beam. During sway motions the bending strains in this non-structural flexural yielding beam are bigger than those in the structural members. Therefore, this non-structural flexural yielding beam yields earlier than the structural girders or columns and acts as damper absorbing vibration energy by its hysteretic performance. In our previous papers the basic dynamic responses of the test models on a shaking table under sine and random wave motions were demonstrated experimentally and in parallel th … More e earthquake responses of the steel buildings with this system were analyzed This system needs limited special devices and has little influence on the architectural planning. Also as optical fiber Bragg grating sensors were installed on the non-structural flexural yielding beams, the damage level of this system has been assessed even after any earthquake.For practical design it had been necessary to confirm the various details associated with the installation of this system using large scaled specimens. This study deals with the large-sale steel frame specimens tested under static cyclic loading. Shown in this paper are that the experimental results and the idealized theoretical model are consistent The effects of the rigidity, strength and size of the non-structural flexural yielding beam (damper beam) on the equivalent damping factor as a damper as well as on the elastic-plastic hysteretic absorption energy were discussed. The effects of the shape and size of the bending failure beam as a damper on the elastic-plastic hysteretic performance have also been discussed. The optical fiber Bragg grating sensors have been installed on the surface of the beam and the optical power spectra as well as the strain quantities using their outputs have successfully been measured in detail. It has been shown that the spectra change from sharp one-peak type to multi-peak one due to steel yielding. The characteristics would be useful for assessing the damage level after large earthquake. Less