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Concepts of Seismic Resistant Design

Structural Configuration 1

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Concept of Competent Load Path

Structural Configuration 2

Plan

Elevation

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Which System is Better?

Structural Configuration 3

System A System B

+ +

Overall Strength of System A = System B

Systems Have Same Overall Deformation Capacity

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Which System is Better?

+++

+

System A System B

What is the effect of a premature loss of one element?

Structural Configuration 4

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Increase Local Redundancy by Designing Hinge Sequence

Hinge Sequence

Force

Deformation

Structural Configuration 5

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Versus Simultaneous Hinging

Hinge Sequence

Force

Deformation

Structural Configuration 6

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Distributed vs Simultaneous Hinging

Force

Distributed

Simultaneous

Deformation

Structural Configuration 7

Simultaneous: Less apparent overstrength

Less post-yield stability

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Avoid Undesirable Mechanisms

Force

Deformation

Structural Configuration 8

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Structural Configuration 9

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Structural Configuration 10

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Avoid Accidental Mechanisms

Vdesign = 2Mp/L

L Vactual = 2Mp/LL

Masonry Wall

Structural Configuration 11

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Avoid Accidental Mechanisms

Structural Configuration 12

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Avoid Accidental Mechanisms

Structural Configuration 13

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Avoid Situations Where the Loss of One

Element is Catastrophic

Structural Configuration 14

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Avoid Re-entrant Corners

(Or Reinforce Accordingly)

Structurally: Improved

Architecturally Dubious

Structural Configuration 15

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Structural Configuration 16

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Protect Nonstructural Elements

Structural Configuration 17