Arches - Click here to see the full chapter
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Arches
Learning Objectives
• You will be able to describe an arch
• You will be able to describe the uses of arches
• You will be able to differentiate between determinate and indeterminate arches
• You will be able to analyze determinate arches
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Arches
Arch is a structure primarily in Compression
Clear Span
Effective Span
Voussiour
Abutment Abutment
KeystoneExtrados(externalcurve)
Intrados(internalcurve)
Soffit(bottom susrface)
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Uses
• buildings
•bridges
Materials
• stone
•brick
•concrete
•steel
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Is this ok?
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What is the problem with this Arch?
Indeterminate
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B
0=Σ BM
A B
Two unkowns Two unknowns
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Arches
Three-hinged Arch - Determinate
Two -hinged Arch - Indeterminate – order one
Fixed Arch - Indeterminate – order three
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B
0=Σ BM
000
=Σ=Σ=Σ
y
x
i
FFMA C
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P= 1198 kP= 1198 k
B
154 ft
AC
l/4l/4
188.5 ft188.5 ft
l
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PTwo Hinged Arch
P
Three Hinged Arch
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Determinate and Indeterminate Arches
Three Hinged Arch-
Determinate
Two Hinged Arch-
Indeterminate ,1st order
Fixed Arch-
Indeterminate,3rd order