School of Civil and Environmental Engineering (SCEE), National University of Sciences and Technology (NUST), Islamabad, Pakistan.
PLoS One. 2022 Jun 13;17(6):e0269910. doi: 10.1371/journal.pone.0269910. eCollection 2022.
A tuned liquid column damper (TLCD) is a passive vibration control device that not only mitigates unwanted structural vibrations but also acts as a water storage facility in a building. These aspects of TLCD make its application specifically suited for building structures. Previously, many experimental works on TLCDs have been conducted considering a single degree of freedom (SDOF) structure. However, the performance of TLCDs to control the response of multi-degree of freedom (MDOF) structure has rarely been studied experimentally. Therefore, this study has investigated the performance of a tuned liquid column damper (TLCD) on a multi-degree of freedom (MDOF) structure using shake table testing. A four-storey steel frame structure equipped with TLCD at the top of the fourth storey has been studied. Experimental normalized frequency response curves for MDOF structure equipped with TLCD have been determined. For this purpose, a series of harmonic loadings including frequencies 0.65 Hz, 1.17 Hz, 1.30 Hz, 1.43 Hz and 1.95 Hz have been applied in addition to historic earthquake loading. Peak and root-mean-square (RMS) accelerations have been discussed in detail for all the applied loadings at each storey level of the structure. For comparison purposes, the percentage reductions in peak and RMS accelerations have been calculated and compared. Also, RMS displacements and inter-storey drifts have been presented for resonant and seismic excitations. Both in time and frequency domains, responses of controlled MDOF structure have been analyzed and compared with uncontrolled structure. Results confirmed that TLCD has improved the MDOF structure responses at harmonic loadings frequencies near resonance and historic earthquake excitations. Furthermore, the improvement in the responses of MDOF structure with TLCD is more prominent at harmonic loadings compared to historic earthquake loading.
调谐液体阻尼器（TLCD）是一种被动的振动控制装置，不仅可以减轻不需要的结构振动，还可以在建筑物中充当储水设施。TLCD 的这些方面使其特别适用于建筑物结构。以前，已经对 TLCD 进行了许多基于单自由度（SDOF）结构的实验工作。然而，TLCD 控制多自由度（MDOF）结构响应的性能很少进行过实验研究。因此，本研究通过振动台测试研究了调谐液体阻尼器（TLCD）对多自由度（MDOF）结构的性能。研究了在第四层顶部装有 TLCD 的四层钢框架结构。已经确定了装有 TLCD 的 MDOF 结构的实验归一化频率响应曲线。为此，除了历史地震荷载外，还施加了一系列包括频率为 0.65 Hz、1.17 Hz、1.30 Hz、1.43 Hz 和 1.95 Hz 的谐波荷载。详细讨论了结构各层在所有施加荷载下的峰值和均方根（RMS）加速度。为了进行比较，计算并比较了峰值和 RMS 加速度的降低百分比。还呈现了共振和地震激励下的 RMS 位移和层间漂移。在时间和频率域中，都分析和比较了受控 MDOF 结构和未控结构的响应。结果证实，TLCD 改善了谐波荷载频率接近共振和历史地震激励下的 MDOF 结构的响应。此外，与历史地震荷载相比，TLCD 对 MDOF 结构响应的改善在谐波荷载下更为明显。
