Pertemuan 07 Daya Dukung Pondasi Dangkal
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Transcript of Pertemuan 07 Daya Dukung Pondasi Dangkal
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MatakuliahMatakuliah : S2094 / Rekayasa Pondasi: S2094 / Rekayasa PondasiTahunTahun : 2005: 2005VersiVersi : 1.1: 1.1
Pertemuan 07Pertemuan 07Daya Dukung Pondasi DangkalDaya Dukung Pondasi Dangkal
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Shallow FoundationsShallow Foundations
• Shallow Foundations versus Deep Shallow Foundations versus Deep FoundationsFoundations
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Shallow FoundationsShallow Foundations
• Usually the more economical optionUsually the more economical option• As a general rule, consider deep As a general rule, consider deep
foundations only when shallow foundations only when shallow foundations do not give satisfactory foundations do not give satisfactory designdesign
• Types of Shallow foundationsTypes of Shallow foundations• Spread footings (square, circular, Spread footings (square, circular,
rectangular)rectangular)• Combined FootingsCombined Footings• Continuous Footings Continuous Footings • Mat or Raft Foundations Mat or Raft Foundations
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Combined/Strap FootingCombined/Strap Footing
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Construction MethodsConstruction Methods
• Excavation; Backhoe followed by Excavation; Backhoe followed by handworkhandworko Neat footing-no formwork usedNeat footing-no formwork usedo Formed footingFormed footing
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Mat (or Raft) FoundationMat (or Raft) Foundation
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Computation of Bearing Computation of Bearing PressurePressure
Bearing PressureBearing Pressure– Gross Bearing Pressure (q)Gross Bearing Pressure (q)– Net Bearing Pressure(qNet Bearing Pressure(q´)´)Bearing CapacityBearing Capacity– Ultimate Bearing Capacity (qUltimate Bearing Capacity (qultult))– Allowable Bearing Capacity (qAllowable Bearing Capacity (qa)a)
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Computation of Bearing Computation of Bearing PressurePressure
Column Load (Ex 5.1)Column Load (Ex 5.1)
Wall Load (Ex 5.2)Wall Load (Ex 5.2)D
f uAWP
q
D
f
uB
bW
bP
q
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Net Bearing PressureNet Bearing PressureNet Bearing Pressure (qNet Bearing Pressure (q´) ´)
Floating FoundationFloating Foundation– When qWhen q´ = 0´ = 0– ExampleExample: Student Center Building at MIT: Student Center Building at MIT
Estimated without floatation settlement = 1.0ft Estimated without floatation settlement = 1.0ft and settlement with partial floatation was 2-3 and settlement with partial floatation was 2-3 inchesinches
zoqq
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Eccentric Loads or MomentsEccentric Loads or Moments
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Eccentric Loads or MomentsEccentric Loads or Moments
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Eccentric Loads or MomentsEccentric Loads or Moments
Beu
AWP
q Df 61min
Beu
AWP
q Df 61max
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Two-way Eccentric Loads or Two-way Eccentric Loads or MomentsMoments
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Eccentric Loads or MomentsEccentric Loads or Moments
Le
Beu
AWP
q LBD
f 661
For contact pressure to remain (+) ve everywhere,
0.166
Le
Be LB