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Base Isolation Method in Building Construction

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 unfavourable 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 Method of Building Construction

Base Isolation is the most common System

The Concept of Base Isolation

Significantly Increase the Period of the Structure and the Damping so that the Response is Significantly Reduced

Base Isolation Method of Building Construction

Base Isolation in Buildings

Base Isolation in Building

Isolator Components between the Foundation and Superstructure

Base Isolation in Building

Fig: An Isolation Interface is formed

Base Isolation in Building

Base Isolation in Building

How exactly does Base Isolation Work?

Most types of Isolators exhibit nonlinear behavior

Base Isolation in Building

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

Base Isolation in Building

Response of Base Isolated Buildings versus Fixed Base ResponseBase Isolation in Building

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