Friction pendulum-strengthened tuned liquid damper (FPTLD) for earthquake resilience of isolated structures
Friction pendulum-strengthened tuned liquid damper (FPTLD) for earthquake resilience of isolated structures
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DOI：
10.1016/j.ijmecsci.2022.108084
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发表时间：
2022-12
影响因子：
7.3
通讯作者：
Zhipeng Zhao;Xiuyan Hu;Qingjun Chen;Yanchao Wang;Na Hong;Ruifu Zhang
中科院分区：
文献类型：
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作者：
Zhipeng Zhao;Xiuyan Hu;Qingjun Chen;Yanchao Wang;Na Hong;Ruifu Zhang
传统的基础隔震通常用于保护结构免受破坏性地震的影响。然而，基础隔震结构容易受到地面运动的影响，包括共振频率分量，这会导致隔震层的显著位移和减弱的隔震效果。为了解决这个问题，本研究开发了一种摩擦阻尼器加强调谐液体阻尼器（FPTLD）作为一个混合的隔离系统，它包括一个摩擦摆子系统安装在底部的液体罐内的晃动液体。建立了FPTLD的结构和理论分析模型，并在此基础上对FPTLD的调谐液体子系统进行了实验测试，对FPTLD整机进行了有限元仿真。在概率框架内，对一个安装了FPTLD的隔震结构进行了非线性随机响应分析。相应地，通过广泛的参数分析阐明了FPTLD相对于常规和TLD装备的隔离系统的双模态和基于轻量化的控制优势。基于隔震层和上部结构同时控制的思想，提出了基于多性能的FPTLD结构设计框架，并通过对数值设计结果的拟合，得到了一个易于使用的设计公式。为了说明所开发的设备和设计方法的有效性，FPTLD被用于一个典型的基础隔震建筑受到各种地震激励。研究结果表明，优化后的FPTLD具有可调的调谐度-液体晃动和摩擦阻尼-是非常有效的，可以同时提高上部结构和隔震层的多个抗震性能。特别是，与传统的和调谐的液体阻尼器装备的隔离系统相比，FPTLD有利于充分利用整个液体，通过实施摩擦阻尼器来有效地吸收能量，减少隔离地板的变形需求。受益于具有恒定隔离周期的摩擦阻尼器，FPTLD针对液体高度的变化展示了稳健的多性能缓解效果。因此，它提出了一个实用的解决方案，改造或新的基础隔震结构使用非特定设计的液体罐或景观。
Conventional base isolation has been commonly used to protect structures against destructive earthquakes. However, base-isolated structures can be vulnerable to ground motions, including resonant frequency components, which cause significant displacement of the isolation floor and a weakened isolating effect. To address this issue, this study develops a friction pendulum-strengthened tuned liquid damper (FPTLD) as a hybrid isolating system that comprises a friction pendulum subsystem mounted at the bottom of a liquid tank with sloshing liquid inside. Its configuration and theoretical analysis model are established, based on which the experimental test of the tuned liquid subsystem and finite element simulation of the complete FPTLD are conducted for validation. The nonlinear stochastic response analysis is performed for an FPTLD-equipped isolated structure within a probabilistic framework. Correspondingly, the dual-modal and lightweight-based control benefits of the FPTLD over conventional and TLD-equipped isolation systems are clarified by an extensive parametric analysis. Based on the simultaneous control of the isolation floor and the superstructure, a multiperformance-based design framework is presented for the FPTLD, and an easy-to-use design formula is obtained by fitting its numerical design results. To illustrate the effectiveness of the developed device and the design method, the FPTLD is used in a typical base-isolated building subjected to various seismic excitations. The obtained results show that the optimized FPTLD with adjustable tuning degrees—liquid sloshing and friction pendulums—is highly effective in simultaneously enhancing the multiple seismic performances of the superstructure and the isolation floor. In particular, compared with conventional and tuned liquid damper-equipped isolation systems, the FPTLD facilitates sufficient utilization of the entire liquid for efficient energy absorption by implementing friction pendulums, reducing the deformation demand of an isolation floor. Benefitting from the friction pendulums with a constant isolating period, the FPTLD demonstrates a robust multiperformance mitigation effect against the variation in the liquid height. It thereby presents a practical solution to the retrofitting or new construction of a base-isolated structure using a nonspecific designed liquid tank or landscape.