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CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
Chapter 8 Theory of Linear
Seismically Isolated Systems
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CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
CONTENT 1. Introduction 2. Theory of Linear Seismically Isolated Systems
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CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
Major References • Chapter 9
– Sections 9.1 and 9.2
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CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
1. Introduction • Seismic isolation system involves installation of
isolators beneath key supporting points of a structure.
• Isolators have much lower lateral stiffness than lateral stiffness of structure
• Seismic isolation system limits seismic energy transfer to structure
• Seismic isolation systems combine two main components:
– Isolator: • e.g. sliding bearings or rubber pads placed between
selected supporting points of structure • Isolators shifts natural period of structure beyond the most
predominant earthquake periods – Energy-dissipation mechanism:
• dampers dissipates residual input energy and limits forces transmitted to structure by increased damping
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CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
1. Introduction
SAN BERNANDINO HOSPITAL, CALIFORNIA, 1993
400 HIGH DAMPING RUBBER BEARINGS AND 186 NONLINEAR VISCOUS DAMPING DEVICES
600mm DISPLACEMENT CAPACITY Photo: Courtesy of M. Constantinou
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CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
1. Introduction
6
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
1. Introduction
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CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
1. Introduction
• Seismic isolation system represents a trade off between force reduction and increased displacement across the isolation system.
• As the flexibility of the isolation system increases, relative movements of the structure relative to its supporting points may become a problem under non-seismic loading, such as wind loads.
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CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
1. Introduction
Video courtesy of Gilberto Mosqueda 9
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
2. Theory of Linear Seismically Isolated Systems
10
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
2. Theory of Linear Seismically Isolated Systems
11
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
2. Theory of Linear Seismically Isolated Systems
12
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
2. Theory of Linear Seismically Isolated Systems
13
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
2. Theory of Linear Seismically Isolated Systems
14
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
2. Theory of Linear Seismically Isolated Systems
+
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CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
2. Theory of Linear Seismically Isolated Systems
16
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
2. Theory of Linear Seismically Isolated Systems
17
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
2. Theory of Linear Seismically Isolated Systems
18
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
2. Theory of Linear Seismically Isolated Systems
19
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
2. Theory of Linear Seismically Isolated Systems
20
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
2. Theory of Linear Seismically Isolated Systems
21
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
2. Theory of Linear Seismically Isolated Systems
22
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
2. Theory of Linear Seismically Isolated Systems
23
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
2. Theory of Linear Seismically Isolated Systems
24
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
2. Theory of Linear Seismically Isolated Systems
25
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
2. Theory of Linear Seismically Isolated Systems
26
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
2. Theory of Linear Seismically Isolated Systems
27
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
2. Theory of Linear Seismically Isolated Systems
28
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
2. Theory of Linear Seismically Isolated Systems
29
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
2. Theory of Linear Seismically Isolated Systems
30
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
2. Theory of Linear Seismically Isolated Systems
31
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
2. Theory of Linear Seismically Isolated Systems
32
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
2. Theory of Linear Seismically Isolated Systems
33
CIE 626 - Structural Control Chapter 1 - Introduction
CIE 626 Structural Control Chapter 8 – Theory of Linear Seismically Isolated Systems
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