scholarly journals NUMERICAL STUDY OF THREE-DIMENSIONAL DYNAMIC BEHAVIOR OF SOIL-PILE-STRUCTURE SYSTEM IN LARGE SHAKING TABLE TESTS

2012 ◽  
Vol 77 (677) ◽  
pp. 1079-1088
Author(s):  
Youhao ZHOU ◽  
Kohji TOKIMATSU ◽  
Hiroyuki YOSHIDA ◽  
Hiroko SUZUKI ◽  
Yasushi NUKUI
Keyword(s):  
Dynamic Behavior ◽  
Numerical Study ◽  
Three Dimensional ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Structure System

Experimental Study on Three-Dimensional Base-Isolated Model with 3DIB

2011 ◽  
Vol 255-260 ◽  
pp. 2325-2329
Author(s):  
Ya Min Zhao ◽  
Jing Yu Su ◽  
Ming Lu
Keyword(s):  
Three Dimensional ◽  
Shaking Table ◽  
Vertical Acceleration ◽  
Shaking Table Tests ◽  
3 Dimensional ◽  
Horizontal Acceleration ◽  
Rubber Bearing ◽  
Lead Rubber Bearing ◽  
Disk Spring ◽  
Fixed Base

A new 3-dimensional isolation bearing (3DIB), which is combined with lead rubber bearing (LRB) and disk spring bearing (DSB), is introduced in this paper. A series of shaking table tests of the 1/2 scale fixed-base and 3DIB base-isolated model were compared to confirm the validity of the 3DIB. Results show that the 3DIB can isolate 3-dimensional earthquake energy remarkably. Large displacement of the 3DIB base-isolated system occurred on the isolation layer, and the inter-story deformation of the superstructure changed slightly. The horizontal acceleration responses of 3DIB model decreased more than 60% and the vertical acceleration responses decreased more than 50% under the severe earthquake of 0.4g in PGA input, which confirmed that 3DIB could isolate both the horizontal and vertical earthquakes obviously.

scholarly journals Dynamic Analysis of a Spring-Asphalt Three-Dimensional Isolation System Based on Cyclic Simple Shear and Shaking Table Tests

2020 ◽  
Vol 10 (18) ◽  
pp. 6530
Author(s):  
Shouping Shang ◽  
Zhen Wang
Keyword(s):  
Simple Shear ◽  
Low Cost ◽  
Three Dimensional ◽  
Least Square Method ◽  
Least Square ◽  
Shaking Table ◽  
Loading Frequency ◽  
Damping Properties ◽  
Shaking Table Tests ◽  
Isolation System

Damping is one of the important issues related to isolated structures, including the newly proposed low-cost spring-asphalt isolation system. In this study, the damping properties of the system in terms of displacement dependence, frequency dependence and temperature dependence were studied by a cyclic simple shear experiment. Then, the direct least-square method was used to identify the damping properties from the experimental data. Furthermore, to validate the effectiveness of the damping device, a modal analysis was conducted based on multi-dimensional shaking table tests. The results indicate that (1) the hysteretic curves are similar to an ellipse, which means that the asphalt shows characteristics of viscoelastic materials; (2) the damping properties are positively related to the loading frequency and inversely related to the temperature and displacement; and (3) asphalt can provide adequate damping and reduce the displacements of the superstructure by nearly half. On the basis of the experimental test results, an analysis of the modal information with multi-dimensional input is also presented.

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