Dynamic Response of Circular Base Slabs (CBS) Attached to the Seismic Bearing Systems, Inserted for Base-Isolation Underneath the Buildings

There are a few isolated structures that have been subjected to seismic testing. An isolated structure is incapable of tracking, adjusting, and controlling its dynamic characteristics. As a result, field evaluations of solitary structures’ dynamic characteristics are important. The horizontal initial displacement of a base isolation kindergarten made of 46 isolation bearings is 75 mm. The method for creating the horizontal initial displacement condition is illustrated, as are the primary test findings. Horizontal initial displacement is accomplished with the assistance of a reaction wall, rods, and hydraulic pump system. To begin, we removed the building using hydraulic jacks to produce horizontal displacement of the isolation layer and then attached rods to support the building. The rods were then shot and unloaded, causing the building to shake freely, and its dynamic response and other parameters were tested. The results indicate that the natural vibration period of an isolated structure is much greater than the natural vibration period of a seismic structure. The isolation layer’s hysteretic curve as completely filled; upon unloading, the isolation layer as promptly reset; the dynamic response control effect of each was visible, but the top floor’s acceleration was magnified by approximately 1.27 times.

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Evaluation of the dynamic response of structures using auxetic-type base isolation

Frattura ed Integrità Strutturale ◽

10.3221/igf-esis.51.05 ◽

2019 ◽

Vol 14 (51) ◽

pp. 52-70

Author(s):

Georgios Drosopoulos ◽

Preyolin Naidoo

Keyword(s):

Dynamic Response ◽

Base Isolation

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A Smart Base-Isolation Using Piezoelectric Friction Damper

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.250-253.1281 ◽

2011 ◽

Vol 250-253 ◽

pp. 1281-1286 ◽

Cited By ~ 2

Author(s):

Na Xin Dai ◽

Ping Tan ◽

Fu Lin Zhou

Keyword(s):

Dynamic Response ◽

Control Strategy ◽

Base Isolation ◽

Friction Damper ◽

Isolation System ◽

High Efficient ◽

Base Isolation System ◽

External Power ◽

Rubber Bearings ◽

Smart Base Isolation

A smart base-isolation system, composed of low damping bearings and piezoelectric friction damper is studied in this paper. The semi-active piezoelectric friction damper (PFD[1]) is proposed for control of peak dynamic response of seismic-excited structures. In the proposed PFD device, the friction force between two sliding plates is regulated by controlling the normal force using piezoelectricity across the damper, and its advantage is that its operation requires only minimal external power. A high efficient control algorithm is proposed for the semi-active control of the friction damper using a simple static output. The effectiveness of the PFD device and the control strategy in reducing the peak dynamic response of structures is investigated through an application to a 5-story base-isolated building. Numerical results demonstrate that the proposed PFD device and the control strategy are effective in reducing the peak drift of rubber-bearings of the base-isolated building subject to earthquakes.

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Influence of Elastomeric Bearings on Traffic-Induced Vibration of Highway Bridges

Transportation Research Record Journal of the Transportation Research Board ◽

10.3141/1696-47 ◽

2000 ◽

Vol 1696 (1) ◽

pp. 76-82 ◽

Cited By ~ 5

Author(s):

Mitsuo Kawatani ◽

Yoshikazu Kobayashi ◽

Hideaki Kawaki

Keyword(s):

Dynamic Response ◽

Base Isolation ◽

Environmental Influence ◽

Reaction Force ◽

Three Dimensional ◽

Highway Bridges ◽

Horizontal Displacement ◽

Elastomeric Bearings ◽

Girder Bridges ◽

Rubber Bearings

Elastomeric bearings (rubber bearings) have been used in highway pseudo-continuous bridges without joints changed from simple girders to reduce the environmental influence of traffic-induced vibration. In addition, elastomeric bearings have been adopted in simple girder bridges for base isolation systems of earthquakeproof structures. Three-dimensional analysis of dynamic response of bridges under moving vehicles is carried out to examine the change of dynamic response in bridges caused by replacing steel bearings with elastomeric bearings. Analytical results are compared with experimental results in urban highway bridges. It is not shown clearly in experiments that natural frequencies are changed slightly in analysis by replacing steel with elastomeric bearings. Although vertical displacements of main girders at the span center do not almost change between steel and elastomeric bearings, horizontal displacement in the bridge axis direction becomes larger with elastomeric bearings. For the evaluation of the experimental acceleration of the ground motion, the dynamic reaction force is analyzed and the dynamic influence is investigated.

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Random Earthquake Response Analysis of Eccentric Structure with Base Isolation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.368-373.915 ◽

2011 ◽

Vol 368-373 ◽

pp. 915-919

Author(s):

A Ping Wang ◽

Peng Chang ◽

Peng Zhang

Keyword(s):

Dynamic Response ◽

Seismic Waves ◽

Base Isolation ◽

Soil Conditions ◽

Response Analysis ◽

Structural Parameter ◽

Coupled Vibration ◽

Eccentric Structure ◽

Earthquake Response Analysis ◽

Equivalent Linear Model

To study dynamic response law when the isolated structure eccentric, random vibration of eccentric isolation structure is analyzed by generalized frequency response function in different structural parameter and site conditions, soil conditions, and isolation layer use the equivalent linear model, the structure level-torsion coupled vibration characteristics are considered. By calculation, statistical law of structure random dynamic response of eccentric isolation structure under seismic waves is given.

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Fine structure of the rectal papillae of the oriental fruuit fly, Dacus dorsalis Hendel (Tephritidae, Diptera Insecta)

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100160042 ◽

1990 ◽

Vol 48 (3) ◽

pp. 498-499

Author(s):

Len Wen-Yung ◽

Mei-Jung Lin

Keyword(s):

Fine Structure ◽

Cell Membrane ◽

Intercellular Space ◽

Anterior Part ◽

Apical Cell ◽

Posterior Part ◽

Apical Cell Membrane ◽

Dacus Dorsalis ◽

Radial Cell ◽

Circular Base

Four cone-shaped rectal papillae locate at the anterior part of the rectum in Dacus dorsalis fly. The circular base of the papilla protrudes into the haemolymph (Fig. 1,2) and the rest cone-shaped tip (Fig. 2) inserts in the rectal lumen. The base is surrounded with the cuticle (Fig. 5). The internal structure of the rectal papilla (Fig. 3) comprises of the cortex with the columnar epithelial cells and a rod-shaped medulla. Between them, there is the infundibular space and many trabeculae connect each other. Several tracheae insert into the papilla through the top of the medulla, then run into the cortical epithelium and locate in the intercellular space. The intercellular sinuses distribute in the posterior part of the rectal papilla.The cortex of the base divides into about thirty segments. Between segments there is a radial cell (Fig. 4). Under the cuticle, the apical cell membrane of the cortical epithelium is folded into a regular border of leaflets (Fig. 5).

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Human pilot dynamic response in flight and simulator.

PsycEXTRA Dataset ◽

10.1037/e436752004-001 ◽

1958 ◽

Cited By ~ 4

Author(s):

Edward Seckel ◽

Ian A. M. Hall ◽

Duane T. McRuer ◽

David H. Weir

Keyword(s):

Dynamic Response

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