ANIDIS - L'ingegneria Sismica in Italia, ANIDIS XIX & ASSISi XVII - 2022

Dimensione del carattere:  Piccola  Media  Grande

Shake table tests on a new passively controlled system with pulley amplification mechanisms for suspended ceilings

Ryo Majima, Tomonari Haruyama, Shigeki Sakai, Yasuo Yamasaki, Taiki Saito

Ultima modifica: 2022-08-08


Passive response control systems have been adopted as a common practice to mitigate the seismic response of structures. Meantime, suspended ceiling systems (SCS) have frequently suffered severe damage among nonstructural elements during earthquakes in the last decade. This paper presents the shake table test results on a new passive control system developed for indirect-SCSs employing a damped cable system equipped with pulley tackle amplification mechanisms, named "Pulley Damper Ceiling System (PDCS)". In this study, the seismic performance of the SCSs with and without the presence of the proposed system is investigated based on a series of full-scale shake table tests. In particular, one-direction shake table tests on a total of six SCSs, a non-damped SCS, a steel-braced-SCS, and four SCSs with different PDCS configurations, are primarily tested to evaluate the fundamental response reduction effect of the PDCS. Additionally, two-directions shake table tests on the SCSs with PDCS are carried out to confirm the seismic response reduction efficiency and dynamic behavior of the PDCS under bidirectional earthquake motions. The experimental observations showed that the PDCS successfully amplified the damper displacements and velocities. Besides, the PDCS sufficiently mitigates both displacement and acceleration response by comparing to the conventional and braced SCSs.

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