Experimental Study on Vertical Base-Isolated System with Disk Spring

2012 ◽  
Vol 166-169 ◽  
pp. 788-792
Author(s):  
Yamin Zhao ◽  
Jingyu Su ◽  
Ming Lu
Keyword(s):  
Shaking Table ◽  
Base System ◽  
Performance Tests ◽  
Shaking Table Tests ◽  
Seismic Responses ◽  
Vertical Stiffness ◽  
Disk Spring ◽  
Fixed Base ◽  
Structural Responses ◽  
Vertical Base

A new vertical isolator designed by disk spring, called combined disk spring bearing (DSB), is introduced in this paper. DSB is composed of one main disk spring bearing and eight secondary disk spring bearings. Performance tests show that DSB had good property of variable vertical stiffness and high vertical damping. Then, the effectiveness of DSB vertical base-isolated devices in reducing structural responses caused by earthquakes through a series of 1/2 scale shaking table tests. are conducted to study the seismic responses of the and the DSB vertical-isolated system. Compared with the fixed-base system, experimental results show that the DSB vertical-isolated system can isolate vertical earthquake energy remarkably. Large displacement of the DSB vertical-isolated system occurred on the isolation layer, and the inter-story deformation of the superstructure changed slightly. The acceleration responses of DSB vertical-isolated system decreased more than 50% and the displacement responses decreased more than 40% at 0.4g PGA, which confirmed that DSB could decrease the seismic responses effectively.

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.

Shaking-table tests of seismic responses of slender intake tower-hoist chamber systems

2021 ◽  
Vol 242 ◽  
pp. 112517
Author(s):  
Hanyun Zhang ◽  
Cai Jiang ◽  
Shuming Liu ◽  
Liaojun Zhang ◽  
Chen Wang ◽  
...  
Keyword(s):  
Shaking Table ◽  
Shaking Table Tests ◽  
Seismic Responses

Shaking table tests on the seismic responses of underground structures in coral sand

2021 ◽  
Vol 109 ◽  
pp. 103775
Author(s):  
Xuanming Ding ◽  
Yanling Zhang ◽  
Qi Wu ◽  
Zhixiong Chen ◽  
Chenglong Wang
Keyword(s):  
Shaking Table ◽  
Shaking Table Tests ◽  
Seismic Responses ◽  
Underground Structures ◽  
Coral Sand

Experimental Study of a Multiple Bay Structure Isolated With Hybrid Bearings

2003 ◽  
Author(s):  
C. S. Tsai ◽  
Bo-Jen Chen ◽  
Tsu-Cheng Chiang ◽  
Guan-Hsing Lee
Keyword(s):  
Earthquake Engineering ◽  
Base Isolation ◽  
Steel Structure ◽  
Seismic Energy ◽  
Shaking Table ◽  
Element Formulation ◽  
Shaking Table Tests ◽  
Seismic Responses ◽  
Promising Tool ◽  
Rubber Bearings

In conventional earthquake resistance design approach (the ductility-design philosophy), the energy dissipation mechanism is based on plastic deformations at scattered locations in the structure. However, this can produce permanent damage to the joints as well as the larger interstory displacements. In recently years, the base isolation technology has been adopted as a feasible and attractive way in improving seismic resistance of structures. It can shift the natural periods of structures away from the rich periods contents of earthquake motions, but also provide considerable supplemental damping to dissipate seismic energy transmitted into structures during earthquakes. In this paper, uniaxial, biaxial, and triaxial shaking table tests are performed to study the seismic behavior of a 0.4-scale three-story isolated steel structure in the National Center for Research on Earthquake Engineering in Taiwan. Experimental results demonstrate that structures with hybrid rubber bearings can actually decrease the seismic responses of the superstructure. It has been proved through the shaking table tests that the rubber bearing is a very promising tool to enhance the seismic resistibility of structures. Moreover, it is illustrated that the proposed analytical model and finite element formulation in this paper can well predict the mechanical behavior of rubber bearings and seismic responses of the base-isolated structures.

Experimental Study of a Full Scale Building Isolated With Multiple Friction Pendulum System With Multiple Sliding Interfaces

2011 ◽  
Author(s):  
C. S. Tsai ◽  
Y. M. Wang ◽  
H. C. Su
Keyword(s):  
Full Scale ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Pendulum System ◽  
Residual Displacements ◽  
Fixed Base ◽  
Sliding Interfaces ◽  
Friction Pendulum ◽  
Base Structure ◽  
Friction Pendulum System

Presented in this paper is the performance evaluation of the multiple friction pendulum system (MFPS) with multiple sliding interfaces on seismic mitigation through a series of shaking table tests of a full scale MFPS-isolated building. In the tests, a three-story steel building of 40 tons in total weight, 3m and 4.5m in two horizontal directions and 9m in height, was equipped with MFPS isolators each with 4 sliding interfaces and subjected to various types of earthquakes to examine the efficiency of the isolators in reducing seismic response of a structure. Experimental results from shaking table tests tells that the roof accelerations, base shears, column shear forces have been significantly lessened with negligible residual displacements in the isolators while compared to the responses of a fixed-base structure.

Experimental Investigation on Mid-Story Isolated Structures

2010 ◽  
Vol 163-167 ◽  
pp. 4014-4021
Author(s):  
Xiang Yun Huang ◽  
Fu Lin Zhou ◽  
She Liang Wang ◽  
Liu Han Wen Heisha ◽  
Xue Hai Luo
Keyword(s):  
Dynamic Characteristics ◽  
Shaking Table Test ◽  
Base Isolation ◽  
Shaking Table ◽  
Dynamic Responses ◽  
Seismic Responses ◽  
Isolation Technique ◽  
Vertical Stiffness ◽  
Isolation Layer ◽  
Rubber Bearings

Isolation technique has been acceded as a part of the China Seismic Code for Design of Buildings. In this code, the limitations for using isolation design are very strict, superstructure must be regular and the isolation layer must be located on the top of base (base isolated structure). Because of the needs of architecture and function or the feasibility of technique, some limitations have been broken in recent projects. Sometimes isolated layer can be set on the intermediate story, so-called the mid-story isolated structure. According to the characteristic of structure, isolation layer of mid-story isolated structure is set on a place where the structure’s vertical stiffness is suddenly changed, as like the top of the first story, middle story, conversion story of the structure. Laminated rubber bearings (LRB) are adopted as an isolation layer. Because the isolation layer is set on intermediate story, the whole structure is divided into superstructure and substructure; the structure’s dynamic characteristics are changed. The mechanism of mid-story isolated structure appears different characteristic compared with base isolation. The aim of mid-story isolation is not only to reduce seismic responses of superstructure, but also to reduce seismic responses of the substructure. Theoretical analysis and the shaking table test of the mid-story isolated structure were carried. And the response of mid-story isolated structure is discussed by comparing with the response of base-isolated structure and base fixed structure. The key problems of mid-story isolated structure are the force condition and the interaction of the structure up and below the isolation layer. Many factors, such as the number of story, mass, stiffness of superstructure and substructure, parameter of the isolation layer, have influence on the seismic behavior of the mid-story isolated structure. The optimum combination relationship of these factors is presented and dynamic characteristics and dynamic responses are investigated.

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