03-27-2013, 12:36 PM
(This post was last modified: 03-27-2013, 01:27 PM by pezhmankhan.)
Modeling and Seismic Performance Evaluation of High Voltage Transformers and Bushings
Author: A. M. Reinhorn, K. Oikonomou, H. Roh, A. Schiff and L. Kempner Jr. | Size: 10.9 MB | Format: PDF | Quality: Unspecified | Publisher: MCEER | Year: 2011 | pages: 242 | ISBN: 1520-295X
Detailed techniques for the modeling of the bushings are presented in this report along with a discussion on the sensitivity of interactions. Additional investigations were conducted to explore feasibility and approximations in analyzing simplified models in which the tank cover and the bushings are separated from the transformer. The report presents the sensitivity study onmodeling various boundary conditions in the simplified model in an effort to match the response of the bushings with the response obtained from the full model.
The report also presents the global amplification effects of the tank construction on the response of the tank cover at base of bushings, and the effects on the apparent dynamic properties of bushings. Recommendations for guidelines on modeling transformers and bushings can be derived from this work.
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Seismic Design and Analysis of a Precast Segmental Concrete Bridge Model
Author: M. Anagnostopoulou, A. Filiatrault and A. Aref | Size: 6.9 MB | Format: PDF | Quality: Original preprint | Publisher: MCEER | Year: 2011 | pages: 208 | ISBN: 1520-295X
This report studies the response of a precast segmental bridge model, designed according to the Accelerated Bridge Construction (ABC) techniques, when subjected to earthquake induced loads. A prototype bridge system is selected [Megally et al., 2002] and modified to comply with the ABC requirements for precast segmental bridges. The segmental bridge model is then scaled down to a 1/2.39-scale experimental model. The superstructure of the scaled bridge model consists of a single-span single-cell box girder, and its substructure consists of two square hollow piers. By means of modern structural experimental techniques, such as shake table dynamic testing, the large-scale precast segmental bridge specimen will provide valuable information on the behavior of such systems under seismic loading.
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Performance Assessment of Conventional and Base-Isolated Nuclear Power Plants for Earthquake and Blast Loadings
Author: Y.-N. Huang, A. S. Whittaker and N. Luco | Size: 6.4 MB | Format: PDF | Quality: Unspecified | Publisher: MCEER | Year: 2008 | pages: 400 | ISBN: 1520-295X
The sample NPP reactor building studied in this report is composed of containment and internal structures with a total weight of approximately 75,000 tons. Four configurations of the reactor building are studied, including one conventional fixed-base reactor building and three base-isolated reactor buildings using Friction PendulumTM, lead rubber and low damping rubber bearings.
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LRFD-Based Analysis and Design Procedures for Bridge Bearings and Seismic Isolators
Author: M. C. Constantinou , I. Kalpakidis, A. Filiatrault and R.A. Ecker Lay | Size: 9.9 MB | Format: PDF | Quality: Unspecified | Publisher: MCEER | Year: 2011 | pages: 436 | ISBN: 1520-295X
This report describes the development and application of analysis and design specifications for bridge bearings and seismic isolators that (a) are based on the LRFD framework, (b) are based on similar fundamental principles, which include the latest developments and understanding of behavior, and © are applicable through the same procedures regardless of whether the application is for seismic-isolated or conventional bridges.
Examples are presented of design of conventional elastomeric and PTFE spherical bearings and three examples of detailed design and analysis of the seismic isolation system of a bridge located in California utilizing lead-rubber, single Friction Pendulum and triple Friction Pendulum isolators. The seismic isolation design examples utilize the latest definition of seismic hazard in California and intent to serve as a guide to application of the technology to bridges in California.
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