Seismic Isolation: New Zealand Applications

1990 ◽  
Vol 6 (2) ◽  
pp. 203-222 ◽  
Author(s):  
G. R. McKay ◽  
H. E. Chapman ◽  
D. K. Kirkcaldie
Keyword(s):  
New Zealand ◽  
United States Of America ◽  
Seismic Isolation ◽  
Effective Means ◽  
Cost Effective ◽  
The United States ◽  
Isolation Systems ◽  
Seismic Isolation Systems ◽  
Earthquake Effects

Seismic isolation of structures has been applied in New Zealand since 1973. To date approximately 45 bridges, 3 large buildings and a few other structures have been protected with this technique. These include 40 bridges and 2 buildings designed by Works and Development Services Corporation (NZ) Ltd (WORKS). Numerous energy dissipating devices have been developed and tested by New Zealand researchers. Six of these designs have proved to be convenient and economical and have been incorporated in the seismic isolation systems of the structures built. Development work on seismic isolation devices is continuing in New Zealand and contact with specialists from other countries - in particular from Japan and the United States of America - is being maintained. Seismic isolation has been found to be a cost effective means of mitigating earthquake effects, particularly if the long term benefits of reduced seismic damage and disruption are taken into consideration.

scholarly journals Improvements to lead-extrusion damper technology

1993 ◽  
Vol 26 (3) ◽  
pp. 342-348 ◽  
Author(s):  
W. J. Cousins ◽  
T. E. Porritt
Keyword(s):  
New Zealand ◽  
Seismic Isolation ◽  
Seismic Events ◽  
Manufacturing Costs ◽  
Alternative Design ◽  
Aftershock Sequences ◽  
Isolation Systems ◽  
Seismic Isolation Systems ◽  
Energy Absorbing ◽  
Constricted Tube

Lead-extrusion dampers are energy absorbing devices that have been designed to provide damping for seismic isolation systems. One type, called the constricted tube damper, has been manufactured for several applications in New Zealand. High manufacturing costs and some performance considerations associated with the damper led to consideration of an alternative design known as the bulged shaft damper. This report describes tests carried out on bulged shaft dampers of two sizes, 100kN and 700kN yielded force. Results show that the bulged shaft design of damper can be expected to perform well during major seismic events, including mainshock/aftershock sequences.

scholarly journals Seismic loss assessment of seismically isolated buildings designed by the procedures of ASCE/SEI 7-16

2021 ◽  
Author(s):  
Shoma Kitayama ◽  
Huseyin Cilsalar
Keyword(s):  
Seismic Isolation ◽  
Cost Effective ◽  
Loss Assessment ◽  
Displacement Capacity ◽  
Seismic Loss ◽  
Seismic Force ◽  
Seismically Isolated ◽  
Isolation Systems ◽  
Seismic Isolation Systems ◽  
Seismic Loss Assessment

AbstractThis paper investigates the seismic loss assessment of seismically isolated and non-isolated buildings with steel moment or braced frames, designed by the seismic design standard of ASCE/SEI 7-16. The seismic loss is calculated from the damage to structural and non-structural components, as well as the demolition and the collapse of buildings. This study demonstrates that the expected annual losses for seismically isolated buildings are half or less than half of those calculated for non-isolated buildings. These losses depend on the types of seismic isolation systems and seismic force resisting systems used. Among the cases of isolated buildings studied in this paper, the most cost-effective systems are found to be the buildings designed by minimum strength requirement in ASCE/SEI 7-16 and with isolators which have displacement capacity 1.5 times larger than the minimum required in ASCE/SEI 7-16, in terms of expected annual losses. This study also compares the results obtained from different approaches of selection and scaling of ground motions. The following research finds that when Incremental Dynamic Analysis approach with far-field ground motion set in FEMA P695 is used, the computed expected total annual losses become doubled from the Conditional Spectra approach.

scholarly journals Some problems vibration and protection of buiding and structures using blocks

2021 ◽  
Vol 79 (1) ◽  
pp. 177-186
Author(s):  
A.F. Bulat ◽  
◽  
A.S. Kobets ◽  
V. I. Dyrda ◽  
V.A. Lapin ◽  
...  
Keyword(s):  
Seismic Isolation ◽  
Vibration Isolation ◽  
Residential Buildings ◽  
The United States ◽  
Seismic Protection ◽  
Eurocode 8 ◽  
Natural Vibration Frequency ◽  
Vibration Protection ◽  
Isolation Systems ◽  
Seismic Isolation Systems

The basic concept of vibration and seismic insulation of buildings and structures based on the use of rubber seismic blocks (RSB) is considered. The concept of seismic isolation of structures is very relevant. In Japan, New Zealand, France, Greece, England, the United States and a number of other countries, it has been successfully used to protect such important structures as nuclear power plants, schools, bridges, museums, administrative and residential buildings from earthquakes. In Ukraine, the concept developed in two ways: the development of seismic isolation blocks for earthquake protection of residential buildings; development of vibration isolation blocks for vibration protection of heavy equipment (weight up to 300 tons, used in Russia, Ukraine) and residential buildings. For the practical application of building seismic isolation systems by the N. S. Geotechnical Mechanics Institute. Experimental studies were carried out to substantiate the RSB parameters, their designs were patented, design documentation was developed and experimental samples of three types of rubber-metal seismic protection blocks with a diameter of 400 mm and 500 mm and a total height of the rubber layer: 2 120 120 mm, 2х70 mm and 2х50 mm were made. The results of the calculation of a rubber-metal seismic support used as an element of vibration-seismic protection of multi-storey residential buildings are presented. The calculation results obtained by approximate analytical methods are compared with experimental data for samples of seismic supports. The design of a pile with vibration-insulating rubber supports is considered. The developed and tested RSB structures were used for vibration protection against metro trains and vehicles of residential buildings in Kiev: a 10-section 10-storey residential building on Kikvidze Street, three 27-storey buildings on Obolonsky Avenue and a residential complex of three houses in Lviv. Vibration and seismic isolation with the help of RSB provides the natural vibration frequency of the building in the horizontal plane of less than 1 Hz, which meets the requirements of the DBN and Eurocode 8 for the design of the building seismic isolation systems.

Analyses of Seismic Isolation Systems in Kyrgyzstan

2002 ◽  
Author(s):  
Tynymbek O. Ormonbekov ◽  
Ulugbek T. Begaliev
Keyword(s):  
Active Zone ◽  
Seismic Isolation ◽  
Seismic Protection ◽  
Kyrgyz Republic ◽  
Isolation Systems ◽  
Seismic Isolation Systems

The purpose of the present work is the analysis of existing methods of seismoisolation in the Kyrgyz Republic at which 95% of territory has seismically active zone with intensity 8, 9 and more. Also an opportunity of application of system seismic protection as rubber-metal bearings.

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