Small scale experimental testing to verify the effectiveness of the base isolation and tuned mass dampers combined control strategy

An innovative hybrid control building system of base-isolation and building-connection has been proposed in the previous study. This system has two advantages, (i) to resist an impulsive earthquake input through the base-isolation system and (ii) to withstand a longduration earthquake input through the building-connection system. A simple response evaluation method without the need of non-linear time-history response analysis is proposed here for this hybrid building system under a long-period and long-duration ground motion. An analytical expression is derived in the plastic deformation of an elastic-perfectly plastic single-degree-of-freedom (SDOF) model with viscous damping under the multi-impulse, which is the representative of long-period and long-duration ground motions. A transformation procedure of a base-isolation building-connection hybrid structural system into an SDOF model is proposed by introducing two steps, one is the reduction of the main base-isolated building to an SDOF system, and the other is the reduction of the connecting oil dampers supported on a free-wall to an oil damper with a newly introduced compensation factor on a rigid wall. Application of the analytical expression of the plastic deformation to the reduced SDOF model including the compensation factor on the connecting oil dampers enables the development of a simplified, but rather accurate response evaluation method. The time-history response analysis of the multi-degree-of-freedom model and the comparison with the proposed simplified formula make clear the accuracy and reliability of the proposed simplified response evaluation method.

Section: Introductionmentioning

confidence: 99%

A Simple Response Evaluation Method for Base-Isolation Building-Connection Hybrid Structural System under Long-Period and Long-Duration Ground Motion

Hayashi

Fujita

Tsuji

et al. 2018

“…This is because the structures with viscous-type dampers can not necessarily possess good performance for the impulsive input like near-fault ground motions resulting from the delay of response in such viscoustype dampers. The overcome of these two difficulties is of great significance in the seismic resistant and control design (Koo et al, 2009, Petti et al, 2010, Karabork, 2011.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, large mass ratio TMDs have been explored mainly for earthquake inputs (Chowdhury et al, 1987;Feng and Mita, 1995;Arfiadi, 2000;Villaverde, 2000;Zhang and Iwan, 2002;Mukai et al, 2005;Villaverde et al, 2005;Tiang et al, 2008;Matta and De Stefano, 2009;Petti et al, 2010;Angelis et al, 2012;Nishii et al, 2013;Xiang and Nishitani, 2014). It should be pointed out that several projects are being planned in Japan aiming at installation of large mass pendulum systems at roof and usage of upper stories as TMD masses.…”

Section: Introductionmentioning

confidence: 99%

Innovative Seismic Response-Controlled System with Shear Wall and Concentrated Dampers in Lower Stories

Tani

Maseki

Takewaki

2017

A new structural control system using damper-installed shear walls in lower stories with reduced stiffness is proposed for vibration control of high-rise RC buildings. That system has some design variables, i.e., height of shear wall, degree of stiffness reduction at lower stories, and quantity of dampers. In this paper, some parametric studies on the shearbeam model with a stiff beam against two kinds of ground motion, a pulse-type sinusoidal wave and a resonant sinusoidal wave, are conducted to clarify the vibration characteristics of the proposed structural control system. It is shown that the optimal combination of design parameters depends on the input ground motion. It is also shown that it is possible to prevent from increasing the response under the one-cycle sinusoidal input resonant to the lowest mode and reduce the steady-state response under the harmonic input with the resonant fundamental period by reducing the stiffness in the lower structure and increasing the damper deformation.

“…On the other hand, it is also true that, while building structures including passive energy dissipating systems are effective for long-duration and long-period ground motions (Takewaki, 2007;Patel and Jangid, 2011, 2012Kasagi et al, 2015), they are not necessarily resilient for pulse-type ground motions. The resolution of these two issues is greatly desired in the field of seismic-resistant and control design (Koo et al, 2009;Petti et al, 2010, Karabork, 2011.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Control System for Greater Resilience Using Multiple Isolation and Building Connection

Taniguchi

Fujita

Tsuji

et al. 2016

An innovative hybrid control building system of multiple isolation and connection is proposed and investigated using both time history and input energy responses for various types of ground motions together with transfer functions. It is concerned that the seismic displacement response at the base-isolation layer of the existing baseisolated buildings may extremely increase under long-period and long-duration ground motions, which are getting great attention recently. In order to enhance the seismic performance of those base-isolated buildings, a novel hybrid system of multiple isolation and building connection is proposed and compared with other structural systems such as an independent multiple isolation system, a hybrid system of base isolation and building connection. Furthermore, the robustness of seismic responses of the proposed hybrid system for various types of ground motion is discussed through the comparison of various structural systems including non-hybrid systems. Finally, the optimal connection damper location is investigated using a sensitivity-type optimization approach.