Influence of base isolation on the response of structures to earthquakes

In this thesis, the seismic analysis of base isolated structures is carried out using a base coordinate relative to the inertial space that renders absolute dynamic response, which is fundamental in assessing base isolation. Moreover, the structure is modeled as an Euler-Bernoulli beam cantilevered on a massive basement. The isolation system is modeled as linear. The stochastic analysis is carried out in the frequency domain using a stationary Clough-Penzien spectral representation for the ground excitation. Standard deviations of the structure’s generalized coordinates and their second derivatives are obtained, which characterize the response, including stresses, of the structure. The effectiveness of base isolation can be evaluated by comparing the response of the isolated structure with the nonisolated counterpart. The results show that base isolation is highly effective in reducing the overall response of the structure. Additionally, it is found that the Clough-Penzien representation does not model adequately in the high frequency range. A modification of this model is proposed.

Name thesis:degree_name

Master of Science

Level thesis:degree_level

masters

Discipline thesis:degree_discipline

Engineering Mechanics

Department dc:contributor.department

Engineering Mechanics

Grantor dc:publisher

Virginia Tech

Year dc:date.issued

1995

Author dc:creator

• Morales Velasco, Cesar Augusto

Statement dc:rights

• In Copyright

Licence dc:rights.uri

• http://rightsstatements.org/vocab/InC/1.0/

Language dc:language.iso

en

Dc Identifier Other

etd-06112009-063136

OAI identifier oai:identifier

oai:vtechworks.lib.vt.edu:10919/43128