FOUNDATION & STRUCTURAL SYSTEMS
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Transcript of FOUNDATION & STRUCTURAL SYSTEMS
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FOUNDATION &
STRUCTURALSYSTEMS
FOUNDATION&
STRUCTURALSYSTEMS
FOUNDATION&
STRUCTURALSYSTEMS
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FOUNDATION &
STRUCTURALSYSTEMS
FOUNDATION
SYSTEMS
FOUNDATION
SYSTEMS
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FOUNDATION &
STRUCTURALSYSTEMS
“The foundation is the building element which distributes and transmits the building load to the
earth.”
“The foundation is the building element which distributes and transmits the building load to the
earth.”
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FOUNDATION &
STRUCTURALSYSTEMS
BuildingLoad
Soil Bearing CapacitySoil Bearing Capacity
SettlementSettlementSettlementSettlement
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FOUNDATION &
STRUCTURALSYSTEMS
“All foundations will settle to some extent”
“All foundations will settle to some extent”
Settlement Magnitude: Usually less that 1”
Uniform Settlement: Acceptable if within the 1”
Differential Settlement: Unacceptable if differences exceed the 1”
Settlement Magnitude: Usually less that 1”
Uniform Settlement: Acceptable if within the 1”
Differential Settlement: Unacceptable if differences exceed the 1”
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FOUNDATION &
STRUCTURALSYSTEMS
What are the different loads which constitute the building load?
What are the different loads which constitute the building load?
Dead Load
Live Load
Wind Loads
Thrusts
Seismic
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FOUNDATION &
STRUCTURALSYSTEMS
SOILSOIL
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FOUNDATION &
STRUCTURALSYSTEMS
GOODGOOD
BADBAD
SOIL TYPES:
Gravel
Sand
Silt
Clay
SOIL TYPES:
Gravel
Sand
Silt
Clay
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FOUNDATION &
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How is the bearing capacity of a soil determined ?
1. Building Code provides minimum values that can be used for some structures.
2. Subsurface Exploration • Test Pits (digging a hole)
• Test Borings (drilling a hole with a hollow auger)
In either case soil samples are obtained and tested in a laboratory.
How is the bearing capacity of a soil determined ?
1. Building Code provides minimum values that can be used for some structures.
2. Subsurface Exploration • Test Pits (digging a hole)
• Test Borings (drilling a hole with a hollow auger)
In either case soil samples are obtained and tested in a laboratory.
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FOUNDATION &
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The soil samples are :
1. Classified
2. Properties determined: • density • moisture content • shear strength • void ratio • bearing capacity • liquid and plastic limits • plasticity index
The soil samples are :
1. Classified
2. Properties determined: • density • moisture content • shear strength • void ratio • bearing capacity • liquid and plastic limits • plasticity index
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FOUNDATION &
STRUCTURALSYSTEMS
GEOTECHNICAL EXPLORATION REPORTVALLEY HOSPITAL
EMERGENCY AND OPERATING ROOM ADDITIONS629 SHADOW LANE
LAS VEGAS, NEVADA
STEPHENS GEOTECHNICAL INC.
SOILS REPORT:
Geotechnical Investigation or Exploration
SOILS REPORT:
Geotechnical Investigation or Exploration
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FOUNDATION &
STRUCTURALSYSTEMS
Soils Report:
1. Site Investigation 2. Lab Investigation 3. Site Conditions 4. Engineering Analysis and Recommendations
• Site Grading &Earthwork
• Foundations & Slabs on Grade• Lateral Earth Pressures • Moisture Protection & Subsurface Drainage• Paving
Soils Report:
1. Site Investigation 2. Lab Investigation 3. Site Conditions 4. Engineering Analysis and Recommendations
• Site Grading &Earthwork
• Foundations & Slabs on Grade• Lateral Earth Pressures • Moisture Protection & Subsurface Drainage• Paving
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FOUNDATION &
STRUCTURALSYSTEMS
CLIMATIC FEATURES
1. Frost line
2. Expansive soil
3. Groundwater
4. Hydrostatic pressure
CLIMATIC FEATURES
1. Frost line
2. Expansive soil
3. Groundwater
4. Hydrostatic pressure
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FOUNDATION &
STRUCTURALSYSTEMS
EXCAVATIONEXCAVATION
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FOUNDATION &
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1. Removal of the topsoil2. Further digging and soil removal
is required to place the foundation out of reach of wind and water.
3. In colder climates much deeper to found the building below the frost line.
1. Removal of the topsoil2. Further digging and soil removal
is required to place the foundation out of reach of wind and water.
3. In colder climates much deeper to found the building below the frost line.
EXCAVATIONEXCAVATION
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FOUNDATION &
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EXCAVATIONEXCAVATION
Excavation in Frictional SoilExcavation in Frictional Soil
Excavation in Highly Cohesive SoilExcavation in Highly Cohesive Soil
Section Through Benched ExcavationSection Through Benched Excavation
Section Through Sheeted ExcavationSection Through Sheeted Excavation
Bracing is required to resist soil pressureBracing is required to resist soil pressure
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FOUNDATION &
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EXCAVATIONEXCAVATION
SHEETING:
• soldier piles
• steel H piles & wood planks (lagging)
• sheet pilings (wood, steel, concrete)
• slurry walls
SHEETING:
• soldier piles
• steel H piles & wood planks (lagging)
• sheet pilings (wood, steel, concrete)
• slurry walls
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FOUNDATION &
STRUCTURALSYSTEMS
FOUNDATIONSFOUNDATIONS
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FOUNDATION &
STRUCTURALSYSTEMSShallowShallow
DeepDeep
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FOUNDATION &
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SHALLOW FOUNDATIONS
“Transfer building load at or near soil surface”
SHALLOW FOUNDATIONS
“Transfer building load at or near soil surface”
1. Footings• Column• Strip, Spread• Wall• Combined
2. Slabs• On-grade• Crawlspace• Basement
3. Mat or Raft
1. Footings• Column• Strip, Spread• Wall• Combined
2. Slabs• On-grade• Crawlspace• Basement
3. Mat or Raft
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FOUNDATION &
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PAD IS CENTERED
UNDER COLUMN
PAD IS CENTERED
UNDER COLUMN
COLUMN FOOTINGCOLUMN FOOTING
FOOTING IS CENTERED
UNDER WALL
FOOTING IS CENTERED
UNDER WALL
WALL FOOTINGWALL FOOTING
COMBINED FOOTINGCOMBINED FOOTING
PROP. LINEPROP. LINE
EXTERIOR COLUMN
EXTERIOR COLUMN
1ST INTERIOR COLUMN1ST INTERIOR COLUMN
CANTILEVER FOOTINGCANTILEVER FOOTING
PROP. LINEPROP. LINE
EXTERIOR COLUMN
EXTERIOR COLUMN
1ST INTERIOR COLUMN
1ST INTERIOR COLUMN
COLUMN FOOTINGSCOLUMN FOOTINGS
CONCRETE BEAM (STRAP)CONCRETE BEAM (STRAP)
SHALLOW FOUNDATIONSSHALLOW FOUNDATIONS
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FOUNDATION &
STRUCTURALSYSTEMSPLANPLAN SECTIONSECTION
REINFORCING STEEL IN BOTH DIRECTIONS IN BOTTOM FACE OF FOOTING RESISTS TENSIONS CAUSED BY BENDING
REINFORCING STEEL IN BOTH DIRECTIONS IN BOTTOM FACE OF FOOTING RESISTS TENSIONS CAUSED BY BENDING
BENDING OF FOOTING CAUSES COMPRESSION IN TOP FACE AND TENSION IN BOTTOM FACE
BENDING OF FOOTING CAUSES COMPRESSION IN TOP FACE AND TENSION IN BOTTOM FACE
UPWARD SOIL PRESSUREUPWARD SOIL PRESSURE
FOOTINGFOOTING
DOWNWARD COLUMN LOADDOWNWARD COLUMN LOAD
SINGLE COLUMN FOOTINGSINGLE COLUMN FOOTING
SHALLOW FOUNDATIONSSHALLOW FOUNDATIONS
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FOUNDATION &
STRUCTURALSYSTEMS
SHALLOW FOUNDATIONSSHALLOW FOUNDATIONSFootingsFootings
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FOUNDATION &
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Types of Substructures:Slab on-grade
Types of Substructures:Slab on-grade
SHALLOW FOUNDATIONSSHALLOW FOUNDATIONS
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FOUNDATION &
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SHALLOW FOUNDATIONSSHALLOW FOUNDATIONS
Slab on-gradeSlab on-grade
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FOUNDATION &
STRUCTURALSYSTEMS
Types of Substructures:Crawlspace
Types of Substructures:Crawlspace
SHALLOW FOUNDATIONSSHALLOW FOUNDATIONS
CRAWLSPACECRAWLSPACE
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FOUNDATION &
STRUCTURALSYSTEMSBasementBasement
Types of Substructures:Basement
Types of Substructures:Basement
SHALLOW FOUNDATIONSSHALLOW FOUNDATIONS
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FOUNDATION &
STRUCTURALSYSTEMS
Types of Substructures:Basement
Types of Substructures:Basement
SHALLOW FOUNDATIONSSHALLOW FOUNDATIONS
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FOUNDATION &
STRUCTURALSYSTEMS
Types of Substructures:Basement
Types of Substructures:Basement
SHALLOW FOUNDATIONSSHALLOW FOUNDATIONS
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FOUNDATION &
STRUCTURALSYSTEMS
HYDROSTATIC PRESSURE ON WALLS AND SLABS BELOW
GROUND WATER LINE
HYDROSTATIC PRESSURE ON WALLS AND SLABS BELOW
GROUND WATER LINE
GROUND WATER LINEGROUND WATER LINE
GROUND LINEGROUND LINE
Types of Substructures:Basement
Types of Substructures:Basement
SHALLOW FOUNDATIONSSHALLOW FOUNDATIONS
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FOUNDATION &
STRUCTURALSYSTEMS
Types of Substructures:Basement
Types of Substructures:Basement
SHALLOW FOUNDATIONSSHALLOW FOUNDATIONS
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FOUNDATION &
STRUCTURALSYSTEMSMAT or RAFTMAT or RAFT
Types of Substructures:Mat or Raft
Types of Substructures:Mat or Raft
SHALLOW FOUNDATIONSSHALLOW FOUNDATIONS
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FOUNDATION &
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DEEP FOUNDATIONS
“Transfer building load far below soil surface”
DEEP FOUNDATIONS
“Transfer building load far below soil surface”
1. Drilled Piers/Caisson• Friction• End Bearing• Belled• Socketed
2. Piles• Friction• End Bearing
1. Drilled Piers/Caisson• Friction• End Bearing• Belled• Socketed
2. Piles• Friction• End Bearing
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FOUNDATION &
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DEEP FOUNDATIONSDEEP FOUNDATIONS
DRILLED PIER/CAISSONDRILLED PIER/CAISSON
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FOUNDATION &
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DRILLED PIER/CAISSONDRILLED PIER/CAISSONLOADLOAD
DRILLED SHAFT FILLED WITH
CONCRETE
DRILLED SHAFT FILLED WITH
CONCRETE
FRICTION BETWEEN PILE
AND SOIL
FRICTION BETWEEN PILE
AND SOIL
DEEP FOUNDATIONSDEEP FOUNDATIONS
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FOUNDATION &
STRUCTURALSYSTEMS
DRILLED PIER/CAISSONDRILLED PIER/CAISSON
DEEP FOUNDATIONSDEEP FOUNDATIONS
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FOUNDATION &
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DRILLED PIER/CAISSONDRILLED PIER/CAISSON
DEEP FOUNDATIONSDEEP FOUNDATIONS
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FOUNDATION &
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DRILLED PIER/CAISSONDRILLED PIER/CAISSON
DEEP FOUNDATIONSDEEP FOUNDATIONS
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FOUNDATION &
STRUCTURALSYSTEMS
PIER /CAISSON – PIER CAPS PIER /CAISSON – PIER CAPS
DEEP FOUNDATIONSDEEP FOUNDATIONS
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FOUNDATION &
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BELLED PIER /CAISSON BELLED PIER /CAISSON
DEEP FOUNDATIONSDEEP FOUNDATIONS
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FOUNDATION &
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BELLED PIER /CAISSON BELLED PIER /CAISSON
DRILLED SHAFT AND BELL FILLED WITH
CONCRETE
DRILLED SHAFT AND BELL FILLED WITH
CONCRETE
BEARING PRESSURE UNDER BELLBEARING PRESSURE UNDER BELL
BELLBELL
LOADLOADDEEP FOUNDATIONSDEEP FOUNDATIONS
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FOUNDATION &
STRUCTURALSYSTEMS
Driven PilesDriven PilesDEEP FOUNDATIONSDEEP FOUNDATIONS
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FOUNDATION &
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Pile Cap
Piles
Floor SlabFloor Slab Floor SlabFloor Slab
Driven PilesDriven PilesDEEP FOUNDATIONSDEEP FOUNDATIONS
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FOUNDATION &
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2 Pile Cluster2 Pile Cluster
3 Pile Cluster3 Pile Cluster
4 Pile Cluster4 Pile Cluster
9 Pile Cluster9 Pile Cluster
Driven Piles - Types of Pile Caps:Driven Piles - Types of Pile Caps:DEEP FOUNDATIONSDEEP FOUNDATIONS
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FOUNDATION &
STRUCTURALSYSTEMS
Steel PointConcrete
PlugOpen
EndedCompressed
BaseCompressed
ConcretePedestal
PileSteel Point
CASED PILES UNCASED PILES
1. Mandrel Driven
2. Driven from the top of the tube 3. Driven from the bottom of the tube 4. Jetted
1,2,3,4 3 2 2
Fluted Tapered
1 1 1 2
Types of Piles:Types of Piles:
DEEP FOUNDATIONSDEEP FOUNDATIONS
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FOUNDATION &
STRUCTURALSYSTEMS
DEEP FOUNDATIONSDEEP FOUNDATIONSPile DriverPile Driver
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FOUNDATION &
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STRUCTURALSYSTEMS
STRUCTURALSYSTEMS
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FOUNDATION &
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FOUNDATION &
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