河南机电高等专科学校Title【PPT-精选】.ppt

Advantages of
Prestressed
Concrete Bridges
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ADVANTAGES OF PRESTRESSED BRIDGES- CASE STUDIES
Bridges Built
Owners and designers
have lol
zed the
low initial cost, low
PlC
maintenance needs and
prestressed concrete
bridges. This is reflected
in the increasing market
share of
prestressed
concrete, which has grown
from zero in 1950 to more
than 55
nt tod a
Source: National Bridge Inventory Dat a
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ADVANTAGES OF PRESTRESSED BRIDGES- CASE STUDIES
This growth continues
very rapidly, not only
for bridges in the short
span range, but also for
spans in excess of 150
feet which. heretofore
has been nearly the
exclusive domain of
structural steel
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ADVANTAGES OF PRESTRESSED BRIDGES- CASE STUDIES
le following examples
illustrate some of these
y advantages
Cost日 efficiencies
precast, prestressed
concrete bridges
Structural/ Engineering
Design Aesthetics
PCI Certified Quality
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ADVANTAGES OF PRESTRESSED BRIDGES- CASE STUDIES
Many bridge designers
are surprised to learn
that precast,
Cost Efficiencies
prestressed concrete
bridges are usually
Structural/ Engineering
lower in first cost than
all other types of
bridges
Design Aesthetics
Coupled with savings
in maintenance
PCI Certified Quality
precast bridges offer
maximum economy
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ADVANTAGES OF PRESTRESSED BRIDGES- CASE STUDIES
Cost Efficiencies and
An old bridge located on a
Speed of Construction
main logging road in Idaho
was replaced with a
prestressed concrete
bridge. The bridge
consists of integral deck
beams on precast
concrete abutments and
wing walls. The heavy
3
spring runoff dictated the
leed for a shallow
superstructure, and the
oad capacity of the
bridge had to be
sufficient to carry off
Fast and Easy Construction
highway logging trucks
that weigh as much as
110 tons each
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ADVANTAGES OF PRESTRESSED BRIDGES- CASE STUDIES
Cost Effi