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Base Isolation
Conventional Construction Practice assumes Fixed Base Structures
The Dynamic Characteristics of Fixed Base Structures are determined by the general characteristics of the structural system
The Designer can only slightly adjust those Dynamic Characteristics
As a matter of fact, most common Building Structures have unfavorable Dynamic Characteristics that result in increased Seismic Response
Earthquake Performance of Fixed Base Structures
Conventional Fixed Base Structures can not be realistically designed to remain elastic in large seismic events (more so in regions of high seismicity)
Common practice is to design them so that they experience damage in a controlled manner and have large inelastic displacements potential
Unconventional Earthquake Protective Systems
Base Isolation is the most common System
The Concept of Base Isolation
Fixed Base
Base Isolated
Period
Response
Significantly Increase the Period of the Structure and the Damping so that the Response is Significantly Reduced
Base Isolation in Buildings
Original Structure
Isolated Structure
Isolation at foundation level
Base Isolation in Buildings
Isolator Components Between the Foundation and Superstructure
An Isolation Interface is formed
Base Isolation in Buildings
Base Isolation in Buildings
How exactly does Base Isolation Work?
Isolators have large deformation potential allowing for large drift on the Isolation Interface
Most types of Isolators exhibit nonlinear behavior
Lengthening of the Structure’s Period and increased Damping that result in a large scale decrease of the Seismic Response
Force – Displacement Relationship at the Isolation Interface
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