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Adaptive control for an active mass damper of a high-rise building with input backlash

Abstract

This article introduces an adaptive control for high-rise building systems afflicted by input backlash. In this approach, the input backlash is deconstructed into an expected control and a bounded but unmeasurable nonlinear errors, and an adaptive term is employed to address the nonlinear error, resulting in the inclusion of a sign function term in the controller, which leads to the chattering phenomenon. In order to avoid it and enhance control effects, adaptive inverse dynamics of backlash are introduced, and a new adaptive inverse control strategy is formulated to achieve vibration control in high-rise buildings. Under the proposed control strategy, a suitable Lyapunov function is chosen for stability analysis, affirming that the system is uniformly ultimately bounded. Finally, results from both numerical simulations and experiments substantiate the efficacy of the proposed scheme.

article Article

date_range 2024

language English

link Link of the paper

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Zhao Zhijia

Chen Yihang

Zou Tao

Teng Xiaofei

Ma Yuhong

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Featured Keywords

Input backlash

Vibration control

Backlash inverse

Boundary control

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Assessment of reinforced concrete building damages following the Kahramanmaraş earthquakes in Malatya, Turkey (February 6, 2023)

Abstract

Earthquakes of magnitude Mw = 7.7 and Mw = 7.6 hit the city of Kahramanmaraş (Turkey) on 6 February 2023. These earthquakes caused serious damage in 11 provinces in Turkey resulting in over 50,000 deaths and huge economic losses with the collapse of thousands of buildings. Two consecutive devastating earthquakes have severely damaged the reinforced concrete building stock located in Malatya. There are many reasons reinforced concrete structures suffer damage under the influence of seismic loads. These reasons can be listed as material and section properties that do not comply with earthquake codes, workmanship defects, ground parameters that are not considered and design errors, as seen in field investigations after earthquakes in Turkey in the past. In this research, a field study was conducted on reinforced concrete buildings damaged after the earthquakes in Malatya province. The causes of structural damages in reinforced concrete buildings between 6–26 years of age were assessed in terms of design and material defects. The structural damages were mainly caused due to insufficient stirrups in structural members, short column, strong beam–weak column, failures of infill walls, soft story type collapse, poor concrete quality, and reinforcement corrosion. In addition to the field investigation, the spectrum relationships created using raw acceleration data obtained from DEMP (Disaster and Emergency Management Presidency) stations in Malatya province were compared with the design response spectra.

article Article

date_range 2024

language English

link Link of the paper

Collapsed buildings

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