seven wonders - gd1 studio fall 2012 · pdf fileseven wonders of the ancient world . ......
TRANSCRIPT
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Pyramid of Meidum
shed 250,000 tons of limestone outer casings
Seven Wonders
of the Ancient World
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Typical Pyramid Pyramid at Meidum
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Mexico • Alameda buildings • Palace of Fine Arts • National Theater • Lake Texcoco
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Design Decisions
• location • size and shape of building • weight of building • flexibility of construction • shallow or deep foundation
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Foundation Location and Design
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• location of good bearing soils for foundation design
• liquid or plastic limits of soil
• percolation rate of soils
• location of underground water
• frost susceptibility – bottom of footing is 12” below Average Frost Depth – data for frost is localized – Saint Paul average frost depth is 4’-0”
• problems from underground surprises
Why get a Soil Test?
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• layers of soils • load-bearing capacity of the soil • stability (clay may swell with water) • drainage characteristics
Soil test information
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• Frictional Soils grain size grain shape
– G=gravel bulky coarse/silica
– S=sand sands
– M=silt flake loams
• Cohesive Soils grain size grain shape
– C=clay plate-like
– O to PT organic peat
Soil Classification and Grading larger sm
aller
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Soils Test
• liquid limit – the water-content point at which the soil passes from a plastic state to a liquid state
• plastic limit – the water-content point when soil loses its plasticity and begins to behave as solid.
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Foundation Types
SHALLOW FOUNDATIONS
• Slab on Grade
• Grade Beam
• Perimeter Foundation Wall / Spread Footing
• Column Pads
• Raft or Mat
DEEP FOUNDATIONS
• Piles (driven)
• Caisson (bored and poured)
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bigger buildings
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• deep foundations
– caissons (drilled piles or piers)
• cast-in-place concrete • 2’-6” minimum diameter • base bearing condition
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• deep foundations
– pile foundation • end-bearing or friction piles • pile caps • tie beams
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DEEP FOUNDATIONS
Piles (driven)
Caisson (bored and poured)
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DEEP FOUNDATIONS
Piles (driven)
Caisson (bored and poured)
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Photograph taken ca. 1897 Recent Photograph
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The Problem
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The Problem
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Differential Settlement
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Foundation Types
SHALLOW FOUNDATIONS
• Slab on Grade
• Grade Beam
• Perimeter Foundation Wall / Spread Footing
• Column Pads
• Raft or Mat
DEEP FOUNDATIONS
• Piles (driven)
• Caisson (bored and poured)
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• isolated footing
• strip footings
• continuous footing
• grade beam
• cantilever, strap footing (tie beam) or combined footings
• mat or raft foundations (also floating foundations)
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Simple shuttering for pad foundations is made up on site.
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The reinforcing cage and some of the formwork for a foundation
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This is one of two reinforced concrete bases which will carry the building's main shear frame.
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Steel columns in the building's frame are fixed to their foundations by bolts which have been precast into the foundations.
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This is the base of one of the legs of the shear frame
The bottom of the leg is bolted onto the top half of the bearing assembly
The bottom half of the bearing is fixed to the concrete foundation
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Here's a view of the main shear frame. The two inner 'legs' of this massive frame are mounted on bearings.
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Steel shims are used to get the steel columns to the correct level - the gap will eventually be filled with a high strength grout.
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After just two days work the steel frame for the ground floor of Building C is taking shape. The eastern and southern sides of the frame are almost complete while the north west corner is still to be erected.
Portland Square
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SHALLOW FOUNDATIONS Slab on Grade Grade Beam Perimeter Foundation Wall /
Spread Footing Column Pads Raft or Mat
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SHALLOW FOUNDATIONS
Perimeter Foundation Wall / Spread Footing
Column Pads
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Foundation Types rule of thumb for sizes
• Column Pads – size for preliminary design is 3’ X 3’ X
12” with #5 bars and anchor plates s connect to bars
• Perimeter Foundation Wall / Spread Footing – footing depth is equal to thickness
of wall (varies with building load, soils)
– footing width is twice thickness of wall
– stepped footing for change in ground’s slope to remain below frost
frost line
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Masonry Wall
Stud Wall
Thickened Edge Slab
Not a frost footing
wall footing column footing
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The foundation runs under all the loadbearing walls.
In this example this includes the external walls……
Strip Foundations
A typical modern detached house will, where possible, sit on strip foundations. Providing the ground is suitable, this is the simplest and cheapest form of foundation.
and the internal walls
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The foundation supports all the loadbearing walls.
This includes the external cavity walls (275mm wide), and the internal walls (100mm wide).
The internal walls are loadbearing because they help support the 1st floor joists.
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The line of the foundations can be highlighted using hydrated lime - here the trench centre line is being marked.
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On some sites you will find both sides of the trench marked.
Digger buckets are available in various widths to suit specific trenches.
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Boning rod
Site rail
Site rail
Correct depth can be checked with a Level and staff.
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When trenches have been excavated they should be checked for ‘square’ etc - mistakes can be expensive once the concrete has been poured.
The trenches should be cleaned out and ‘bottomed-up’ (cleaned out and loose material removed), ready for inspection.
In traditional strip foundations the services cross the trench above the concrete - in trench fill they cross through it.
duct
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Traditional strip
Trench fill
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Trench fill
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Foundation footers for this basement have been completed and the rebar are in place.
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The wall frames have been erected and carefully pinned securely into place. The concrete has been poured and the walls are curing.
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Poured walls have cured so that the frame panels may be removed. The wall frames are being unpinned and the panels taken away.
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Removal of the poured wall frame panels is complete and the walls are allowed to finish curing.
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Balance Assoc. Cabin at Elbow Coulee, Washington State
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D o
w n
h i
l l
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Warehouse: 15th Ave and 8th St
Lucas Deslauriers . Christopher Farrar . Rachel Hilvert . Ryan O’Malley . Stephanie Wichner
Group 7
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Fault Genesis
CB
A
CB
A
B
A
B
A
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Existing Structure Photos
C
B
A
C
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Existing Structure Photos
BA
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Existing Structure Photos
C
B
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Existing Wall Elevation
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Existing Wall Elevation
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wood cast iron
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