Base isolation of an existing 10-storey building to enhance earthquake resistance
Author: W.D. Clark and J.E. Mason Sinclair Knight Merz, Wellington, New Zealand | Size: 334 KB | Format:PDF | Quality:Unspecified | Year: 2004 | pages: 8
The Rankine Brown Building at Victoria University of Wellington, New Zealand houses the University Library and is pivotal to the operation of the University. Built in the early 1960s, the building was of innovative form and construction for its time, with long span precast concrete waffle slabs over 10 floors supported on 16 main columns. Three years ago a review of the building structure suggested that increased protection of the building would be required to meet the University’s expectation for operational continuity after a moderate or major earthquake event in the Wellington area. This paper outlines: Probable areas of structural yielding in a major earthquake event. Structural analysis for base isolation using earthquake time history records. Details of base isolation bearings. Installation of the base isolation bearings.nOther structural details that allow movement of the superstructure to take place due to base isolation.
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SEISMIC PERFORMANCE ASSESSMENT OF NUCLEAR POWER PLANTS
Author: Yin-Nan Huang , Andrew S. Whittaker and Nicolas Luco | Size: 152 KB | Format:PDF | Quality:Unspecified | Publisher: The 14 th World Conference on Earthquake Engineering October 12-17, 2008, Beijing, China | Year: 2008 | pages: 8
Seismic assessments of a sample conventional and base-isolated nuclear power plant (NPP) are performed using a new procedure that builds on the methodology presented in the draft ATC-58 Guidelines and the widely used Zion method, which uses fragility curves defined in terms of ground-motion parameters. The new procedure improves the Zion method by using fragility curves that are defined in terms of structural response parameters since damage and failure of NPP components are more closely tied to structural response parameters than to ground motion parameters. The proposed performance assessment procedure is used to
evaluate the mean annual probability of unacceptable performance of the sample NPP reactor buildings. The
seismic performance assessment confirms the utility of seismic isolation at reducing seismic risk in NPPs.
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SEISMIC RISK AND DAMAGE COST EVALUATION OF BASE ISOLATED BUILDINGS
Author: Luis A. BEDRIÑANA1 and Taiki SAITO2 | Size: 372 KB | Format:PDF | Quality:Unspecified | Publisher: IISEE, Building Research Institute, Tsukuba, Japan. | pages: 8
A methodology to evaluate quantitatively the seismic risk and the cost-effectiveness of a base isolated building
during its lifetime is presented. The process starts with the hazard analysis and the earthquake ground motion
modeling for the studied area. Series of artificial earthquake ground motions are generated by a stochastic method.
To get the response distribution of the target building, several dynamic nonlinear analyses are carried out by using
the generated artificial motions as input waves. By assuming a structural response distribution, the seismic risk
analysis is performed in terms of three structural parameters such as: interstory drift ratio (IDR), floor acceleration
(FA) and the structural damage index (DI). Finally, the cost-effectiveness of using base isolation system is
examined, by comparing the exceedance probability of repair cost in the target building with and without base
isolation during a given time period.
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For structures that receive a large earthquake it is required to apply a good technique which suppresses a danger to the minimum irrespective of existing and establishment. A technique of seismic risk management dealt with the quantitative amount of information is to obtain the anticipative amount of the earthquake damages during access peri
od,and is the support tool to select the higher expense efficiency step to reduce an earthquake damage. In this study,the method of seismic risk management is searched for
using the earthquake proof reliability assessment technique. A seismic lose function is calculated from the earthquake damage factors that are modeled by using fragility curves and event trees. The seismic hazard curve is obtained by Nankai offshore scenario earthquake. The third floor or the eighth floor steel structures on a hard or soft ground in Kochi Prefecture are taken up as SRM(Seismic Risk Management Method) study cases. Using structures from as three kinds of seismic code,costs of both initial construction and life cycle are calculated. As the results,the seismic risk reduces to half by ground conditions. Though initial investment becomes high so that earthquake resi stant construction goes up,the life cycle costs and the seismic risk become small. The seismic risk of the base isolation structure is set to zero,and excels as the earthquake resistant construction. Then,the eighth floor steel structure with the base isolation system is applied to obtain time history responses in comparison of those by the different input wave motions. The base isolation building is able to reduce a strong motion because of the long time period shake,and is efective to the short period large earthquake motion
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The service-life performance of concrete bridge decks, including maintenance, repair, and rehabilitation needs, is directly related to the care exercised from the preconstruction through post-construction period. This guide provides recommendations for bridge deck construction based on considerations of durability, concrete materials, reinforcement, placing, finishing and curing, and overlays.
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# Full title:Numerical modelling of group effects on the distribution of dragloads in pile foundations
# Author(s):C. J. Lee ; M. D. Bolton ; A. Al-Tabbaa
# Publisher: ICE
# Language: English
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SCI P272 Modular Construction using light steel framing: An Architect's Guide
Author: by R.M. Lawson , P.J. Grubb , J. Prewer , P.J. Trebilcock | Size: 4 MB | Format:PDF | Quality:Original preprint | Publisher: The Steel Construction Institute | Year: 1999 | pages: 105 | ISBN: ISBN-10: 1859420966 ISBN-13: 978-1859420966
SCI P272 Modular Construction using light steel framing: An Architect's Guide
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# Full title: Wind turbine foundations - loading, dynamics and design
# Author(s):Bonnett, Danny
# Publisher: IStructE
# Language: English
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Behaviour of Piled Rafts with Piles of Different Lengths and Diameters under Vertical Loading
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Numerical Study of the Bearing Behavior of Piled Rafts
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Employment of the P-Multiplier in Pile-Group Analysis
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Employment of the P-Multiplier in Pile-Group Analysis
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