Basic Study on Response Analysis and Damping Method for Rocking Motion of Connected Cabinets subjected to Base Excitation

2018 ◽  
Vol 2018.93 (0) ◽  
pp. 714
Author(s):  
Takatsugu KIHARA ◽  
Tomohiro ITO ◽  
Atsuhiko SHINTANI ◽  
Chihiro NAKAGAWA
Keyword(s):  
Response Analysis ◽  
Base Excitation ◽  
Basic Study ◽  
Rocking Motion

G1001003 Basic Study on Rocking Motion Considering Sliding of Self-Standing Structure Subjected to Base Excitation

2015 ◽  
Vol 2015 (0) ◽  
pp. _G1001003--_G1001003-
Author(s):  
Hideki SAKURAI ◽  
Tomohiro ITO ◽  
Atsuhiko SHINTANI ◽  
Chihiro NAKAGAWA
Keyword(s):  
Base Excitation ◽  
Basic Study ◽  
Standing Structure ◽  
Rocking Motion

Rocking Stability of Masonry Arches in Seismic Regions

2008 ◽  
Vol 24 (4) ◽  
pp. 847-865 ◽  
Author(s):  
Matthew J. DeJong ◽  
Laura De Lorenzis ◽  
Stuart Adams ◽  
John A. Ochsendorf
Keyword(s):  
Experimental Testing ◽  
Base Excitation ◽  
Masonry Arches ◽  
Masonry Arch ◽  
Specific Criterion ◽  
Earthquake Motion ◽  
Time Histories ◽  
Rocking Motion ◽  
Failure Predictions ◽  
Primary Base

This study evaluates the susceptibility of masonry arches to earthquake loading through experimental testing and progresses toward a specific criterion by which arches can be quickly assessed. Five different earthquake time histories, as well as harmonic base excitations of increasing amplitude, were applied to model arches, and the magnitude of the base motion resulting in collapse was determined repeatedly. Results are compared with failure predictions of an analytical model which describes the rocking motion of masonry arches under base excitation. The primary impulse of the base excitation is found to be of critical importance in causing collapse of the masonry arch. Accordingly, a suite of failure curves are presented which can be used to determine the rocking stability of masonry arches under a primary base acceleration impulse which has been extracted from an expected earthquake motion.

Mitigation of Rocking and Sliding Motion of a Free-Standing Structure Subjected to Base Excitation Using Coaxial Circular Cylinders Containing Highly Viscous Liquid in Annular Spaces

2019 ◽  
Author(s):  
Atsuhiko Shintani ◽  
Tomohiro Ito ◽  
Chihiro Nakagawa
Keyword(s):  
Rigid Body ◽  
Viscous Liquid ◽  
Analytical Model ◽  
Circular Cylinders ◽  
Base Excitation ◽  
Free Standing ◽  
Seismic Input ◽  
Sliding Motion ◽  
Standing Structure ◽  
Rocking Motion

Abstract In this study, the effectiveness of coaxial circular cylinders containing a highly viscous liquid in annular spaces for reduction of rocking motion of a free-standing structure is investigated both analytically and experimentally. First, an analytical model of coupled rocking and sliding motions of a free-standing structure, including the coaxial circular cylinders, subjected to seismic input was derived. The free-standing structure was modeled as a free-standing rigid body. The cylinders were attached to the bottom of the rigid body as a damping device. We then experimentally derived the friction coefficients, inertia moments, and a damping coefficient in the rotating direction. Furthermore, using these parameters, the effectiveness of this system in suppressing the rocking motion is investigated analytically. The proposed method was determined to be very effective in suppressing the rocking motion of a rigid body subjected to a seismic input by the experiment.

619 Basic Study on Leg's Muscular Forces of Upright Human Subjected to Base Excitation

2010 ◽  
Vol 2010.85 (0) ◽  
pp. _6-19_
Author(s):  
Taishi SUGIMOTO ◽  
Tomohiro ITO ◽  
Atsuhiko SHINTANI
Keyword(s):  
Base Excitation ◽  
Basic Study

M722 Basic Study on Rocking Motion Considering Sliding of Self-Standing Structure Subjected to Seismic Wave

2016 ◽  
Vol 2016.91 (0) ◽  
pp. 330
Author(s):  
Hideki SAKURAI ◽  
Tomohiro ITO ◽  
Atsuhiko SHINTANI ◽  
Chihiro NAKAGAWA
Keyword(s):  
Seismic Wave ◽  
Basic Study ◽  
Standing Structure ◽  
Rocking Motion

G1000-3-5 Basic Study on Rocking Motion of a Structure Supported by Nonlinear Springs and Dashpots

2010 ◽  
Vol 2010.5 (0) ◽  
pp. 193-194
Author(s):  
Yoshihiro FUJIWARA ◽  
Tomohiro ITO ◽  
Atsuhiko SHINTANI
Keyword(s):  
Basic Study ◽  
Nonlinear Springs ◽  
Rocking Motion
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