2. NARSEE MONJEE INSTITUTE OF MANAGEMENT | BALWANT SHETH SCHOOL OF ARCHITECTURE | MUMBAI INDIA
CONSTRUCTION STUDIO
LOCATION PLAN: PRIYAM MEHTA
Sacramento River
SUNDIAL BRIDGE
3. NARSEE MONJEE INSTITUTE OF MANAGEMENT | BALWANT SHETH SCHOOL OF ARCHITECTURE | MUMBAI INDIA
CONSTRUCTION STUDIO
SPECIFICATIONS: PRIYAM MEHTA
• Structural Type: Asymmetrical
Cable-stayed Bridge
• Function: Pedestrian bridge
• Location: Turtle bay, California,USA
• Crosses: Sacramento River
• Year completed: 2004
• Materials:
Cables: Steel
Pylon: Reinforced Concrete
Deck: Steel truss
• Dimensions & Quantities:
Main span: 128 m
Pylon height: 66 m
Pylon angle: 42°
SUNDIAL BRIDGE
4. NARSEE MONJEE INSTITUTE OF MANAGEMENT | BALWANT SHETH SCHOOL OF ARCHITECTURE | MUMBAI INDIA
CONSTRUCTION STUDIO
BACKGROUND: PRIYAM MEHTA
• Plans for the Sundial Bridge began in the
1990s, when the city of Redding budgeted
$3 million for a pedestrian bridge across the
river.
• The bridge was completed in 2004, three
years later than originally planned , at a cost
of $23.5 million, with funding from the
Redding-based McConnell Foundation.
• The cable for the bridge totals 4,342 feet
and was made in England.
• This is the only cable-supported bridge that
is not back anchored.
• The bridge is balanced solely through added
weight of inclined pylon.
SUNDIAL BRIDGE
5. NARSEE MONJEE INSTITUTE OF MANAGEMENT | BALWANT SHETH SCHOOL OF ARCHITECTURE | MUMBAI INDIA
CONSTRUCTION STUDIO
DESIGN: PRIYAM MEHTA
• This static concept can be traced back to
the 1986 sculpture by Calatrava entitled
'Running Torso', in which inclined stacked
marble cubes are balanced by a tensioned
wire.
• The bridge does not balance the forces by
using a symmetrical arrangement of cable
forces on each side of its support tower;
instead, it uses a cantilever tower, set at a
42-degree angle and loaded by cable stays
on only one side.
• This design requires that the spar resist
bending and torsional forces and that its
foundation resists overturning.
• While this leads to a less structurally
efficient structure, the architectural
statement is dramatic.
SUNDIAL BRIDGE
6. NARSEE MONJEE INSTITUTE OF MANAGEMENT | BALWANT SHETH SCHOOL OF ARCHITECTURE | MUMBAI INDIA
CONSTRUCTION STUDIO
STRUCTURAL ANALYSIS: PRIYAM MEHTA
• distributed load of road deck
• cable stays in tension, connects road deck
to pylon.
• distributed load of pylon
• reactions
SUNDIAL BRIDGE
7. NARSEE MONJEE INSTITUTE OF MANAGEMENT | BALWANT SHETH SCHOOL OF ARCHITECTURE | MUMBAI INDIA
CONSTRUCTION STUDIO
BENDING MOMENT PRIYAM MEHTA
To calculate the maximum bending
moment within the deck the overall
system must be simplified to a simply
supported beam with a pin connection
at the South side of the Sacramento
River and a fixed connection at the
North side (i.e. the inclined pylon).
SUNDIAL BRIDGE
8. NARSEE MONJEE INSTITUTE OF MANAGEMENT | BALWANT SHETH SCHOOL OF ARCHITECTURE | MUMBAI INDIA
CONSTRUCTION STUDIO
STRUCTURAL ANALYSIS: PRIYAM MEHTA
SUNDIAL BRIDGE
9. NARSEE MONJEE INSTITUTE OF MANAGEMENT | BALWANT SHETH SCHOOL OF ARCHITECTURE | MUMBAI INDIA
CONSTRUCTION STUDIO
STRUCTURAL ANALYSIS: ROAD DECK PRIYAM MEHTA
• The decks structure consists of a
triangular pipe truss system with
varying sized chords.
• The lower chord is 360mm in
diameter while the two top chords
are 280mm in diameter.
• The truss is asymmetrical in cross
section allowing the centroid of the
truss to become closer to the pylon
allowing a smaller cantilever distance
for the pylon to cable connections.
• The cables attaching the deck to the
pylon are connected to the deck
through transverse bulkheads in the
truss.
SUNDIAL BRIDGE
10. NARSEE MONJEE INSTITUTE OF MANAGEMENT | BALWANT SHETH SCHOOL OF ARCHITECTURE | MUMBAI INDIA
CONSTRUCTION STUDIO
CABLE CONNECTION PRIYAM MEHTA
SUNDIAL BRIDGE
11. NARSEE MONJEE INSTITUTE OF MANAGEMENT | BALWANT SHETH SCHOOL OF ARCHITECTURE | MUMBAI INDIA
CONSTRUCTION STUDIO
TORSION WITHIN THE DECK PRIYAM MEHTA
• The 14 cable stays attached to the bridge
deck are not centered on the walkway but
instead dissect the bridge into a major and
minor path. This 2/3 to 1/3 split when
looking longitudinally over the deck creates
torsional affects resulting in the bridge deck
wanting to roll.
• To reduce these effects an asymmetrical
TORSION DIAGRAM
truss system below the aqua marine
translucent glass uses its varying length
members to move the decks center of
gravity closer to the connection line of the
cables. This reduces the cantilever arm so
that the, point center of gravity of the deck
produces a smaller torsional effect.
• The diagram below shows the torsional
moment diagram caused by pedestrian
loading on the 2/3 of the deck. TORSIONAL BENDING MOMENT OF DECK
SUNDIAL BRIDGE
12. NARSEE MONJEE INSTITUTE OF MANAGEMENT | BALWANT SHETH SCHOOL OF ARCHITECTURE | MUMBAI INDIA
CONSTRUCTION STUDIO
INCLINED PYLON PRIYAM MEHTA
• The pylon is 66m tall and is placed on
the North South axis acting as a sundial
casting its shadow on a plaza below.
• no backstays to withstand some of the
bridge decks loading, the pylon is
inclined at 42º to use its dead weight to
equilibrate the moment induced on the
pylon by the deck.
• Due to this lack of backstays the pylon
has a foundation 14m deep to resist the
bending forces allowing them to be
transferred to the ground without
causing overturning.
SUNDIAL BRIDGE
13. NARSEE MONJEE INSTITUTE OF MANAGEMENT | BALWANT SHETH SCHOOL OF ARCHITECTURE | MUMBAI INDIA
CONSTRUCTION STUDIO
INCLINED PYLON PRIYAM MEHTA
SUNDIAL BRIDGE
