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Application of an SMA-based hybrid control device to 20-story nonlinear benchmark building

机译：基于SMA的混合控制装置在20层非线性基准测试中的应用

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摘要

This paper investigates the seismic response control of a 20-story nonlinear benchmark building with a new recentering variable friction device (RVFD). The RVFD combines energy dissipation capabilities of a variable friction damper (VFD) with the recentering ability of shape memory alloy (SMA) wires. The VFD that is the first subcomponent of the hybrid device consists of a friction generation unit and piezoelectric actuators. The clamping force of the VFD can be adjusted according to the current level of ground motion by adjusting the voltage level of piezoelectric actuators. SMA wires that exhibit a unique hysteretic behavior and full shape recovery after experiencing large strains is the second subcomponent of the hybrid device. Numerical simulations of a seismically excited 20-story benchmark building are conducted to evaluate the performance of the hybrid device. A continuous hysteretic model is used to capture frictional behavior of the VFD and a neuro-fuzzy model is employed to describe highly nonlinear behavior of the SMA components of the hybrid device. A fuzzy logic controller is developed to adjust the voltage level of VFDs for favorable performance in an RVFD hybrid application. Results show that the RVFD modulated with a fuzzy logic control strategy can effectively reduce interstory drifts and permanent deformations without increasing acceleration response of the benchmark building for most cases.
机译：本文研究了采用新的偏心可变摩擦装置（RVFD）的20层非线性基准建筑物的地震响应控制。 RVFD将可变摩擦阻尼器（VFD）的能量耗散能力与形状记忆合金（SMA）线材的更新能力相结合。作为混合动力设备的第一子组件的VFD由摩擦产生单元和压电致动器组成。通过调节压电致动器的电压水平，可以根据地面运动的当前水平来调节VFD的夹紧力。 SMA线在经历大的应变后展现出独特的滞后行为和完全恢复形状，是混合设备的第二个子组件。进行了地震激发的20层基准建筑物的数值模拟，以评估混合动力装置的性能。连续滞后模型用于捕获VFD的摩擦行为，而神经模糊模型用于描述混合设备的SMA组件的高度非线性行为。开发了模糊逻辑控制器，以调节VFD的电压电平，从而在RVFD混合应用中获得良好的性能。结果表明，在大多数情况下，采用模糊逻辑控制策略调制的RVFD可以有效地减少层间漂移和永久变形，而不会增加基准建筑物的加速度响应。

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