Seismic Control Device Research Articles

鋼材系制震ブレース付き鉄筋コンクリート造多層偏心骨組における等価単層偏心系モデル

鋼材系制震ブレース付き鉄筋コンクリート造多層偏心骨組における等価単層偏心系モデル

Sliding mode and PID control of a structural system against earthquake

In this study, a non-chattering robust sliding mode controller (SMC) and a proportional integral derivative (PID) Controller are separately designed for an active seismic control device considering a multi-degree-of-freedom structural system against earthquakes. Since the PID control method can be applied easily and is widely known, it has an important place in control applications. But this method is insensitive to parameter changes. The advantage of an SMC is its robustness and ability to handle the non-linear behaviour of the system. The simulated system has four degrees of freedom. A structural system was simulated against the ground motion of the Marmara earthquake ( M w = 7.4 ) in Turkey on August 17th, 1999. The ground motion acts on the base. Both PID and sliding mode controllers are designed to suppress the building vibrations. Since the main effect of an earthquake occurs on the first floor, the controller is placed under it. At the end of the study, the time history of the first and top floor displacements, frequency responses of both the uncontrolled and controlled structures and control voltages are presented and the results are discussed.

アクティブ制震システムの提案と装置エネルギースペクトルによる特性分析 : 制震ダンパでのエネルギー変換を利用したアクティブ制震 その1

This paper proposes an active seismic response control system by making use of an energy conversion in damping devices. In the paper, we describe configuration of the system when it is applied to building structure and show how to classify them. We also show the analytical results on energy characteristics and effectiveness of active seismic response control. The analysis on the energy spectra of the seismic control devices, based on the seismic response, clarify the characteristics of the energy conversion and reuse devices. The feasibility of the proposed system to real buildings is discussed considering the energy balance of the system.

変位依存型付加耐震要素を設置した立面的に整形な多層2軸偏心建物の応答性状

変位依存型付加耐震要素を設置した立面的に整形な多層2軸偏心建物の応答性状

Implementation and testing of passive control devices based on shape memory alloys

SUMMARY Two families of passive seismic control devices exploiting the peculiar properties of shape memory alloy (SMA) kernel components have been implemented and tested within the MANSIDE project (Memory Alloys for New Seismic Isolation and Energy Dissipation Devices). They are special braces for framed structures and isolation devices for buildings and bridges. Their most important feature is their extreme versatility, i.e. the possibility to obtain a wide range of cyclic behaviour * from supplemental and fully re-centring to highly dissipating * by simply varying the number and/or the characteristics of the SMA components. Other remarkable properties are their extraordinary fatigue resistance under large strain cycles and their great durability and reliability in the long run. In this paper, the working mechanisms of the SMA based devices are outlined and the experimental tests carried out to verify the above-mentioned properties are extensively described. Copyright ( 2000 John Wiley & Sons, Ltd.