Smart Seismic Control System for High-Rise Buildings Using Large-Stroke Viscous Dampers Through Connection to Strong-Back Core Frame

Akira Kawai,Tatsuhiko Maeda,Izuru Takewaki

doi:10.3389/fbuil.2020.00029

Akira Kawai, Tatsuhiko Maeda + Show 1 more

Open Access

https://doi.org/10.3389/fbuil.2020.00029

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Abstract

An innovative structural control system is proposed for high-rise buildings. A damping layer is provided between a stiff upper core frame suspended from the top of the main building and a stiff lower core frame connected to the building foundation. As the ratio of stiffness of both core frames to that of the main building becomes larger, the relative displacement in the damping layer (damper deformation) approaches to the top floor displacement of the main building. The large displacement of the top floor displacement of the main building is taken full advantage in the proposed control system as most of the total displacement of the main building results from the damper deformation instead of interstory drift. Transformation of the multi-degree-of-freedom (MDOF) model into the single-degree-of-freedom (SDOF) model enables a simplified but rather accurate response evaluation for pulse-type and long-duration earthquake ground motions. The results of the time history response analysis of buildings including this control system are presented for various recorded ground motions. Finally, the effectiveness of the proposed structural control system is discussed from the viewpoint of earthquake input energy.

Highlights

The effectiveness of the proposed structural control system is discussed from the viewpoint of earthquake input energy in which the original energy transfer function plays a central role (Housner, 1959, 1975; Berg and Thomaides, 1960; Housner and Jennings, 1975; Zahrah and Hall, 1984; Uang and Bertero, 1990; Ordaz et al, 2003; Takewaki, 2004a,b)
A new damper deformation concentration-type structural control system has been proposed for pulse-type and long-duration earthquake ground motions
(2) A simplified seismic response evaluation method to estimate the maximum deformation of the dampers was proposed for the reduced SDOF model, which was subjected to a resonant double impulse to represent near-fault pulse-type ground motions and a resonant multi impulse to represent long-duration, long-period ground motions

Summary

INTRODUCTION

After emerging in the 1980s and 1990s (Leipholz, 1980; Leipholz and Abdel-Rohman, 1986; Housner et al, 1997), the technique of structural control using active and passive control mechanisms has become main stream in structural engineering for tall and special buildings, e.g., base-isolated buildings (Hanson and Soong, 2001; Christopoulos and Filiatrault, 2006; Takewaki, 2009; Lagaros et al, 2012; Domenico et al, 2019). The optimal damper damping coefficient obtained for the multi impulse (Figure 8) minimizes the top displacement of the main building This phenomenon can be seen clearly under the input of OS1 (long-period, long-duration ground motion). The optimal damper damping coefficient obtained for the multi impulse (Figure 8) reduces the maximum interstory drift angle of the main building most effectively. This phenomenon is significant for the input of OS1 (long-period, long-duration ground motion). As the stiffness of strong-back core frame becomes larger, the energy consumption in the dampers governs the main part of the input energy

LIMITATIONS

SUMMARIES AND CONCLUSIONS

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