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driving. It has a joint, rigidity, travelling ride comfort, etc., in 30-120m span is often a
bridge-type scheme winners. The transverse prestressed concrete technology in t-beams, box,
slab three General span girders, obvious technical economic benefits. To broaden the
horizontal tensioning technology, applying it to greater span of continuous beam bridge has
become particularly necessary.
Girder is the continuous support in several piers. At load time, the different sections on
some positive moment, some have negative moment, the absolute value of the moment were
smaller than those in the same span bridge beams. In this way, you can save the main beam o
f material consumption. Continuous beam typically 3 ~ 5 hole into a United, in a with no
deck joints, driving more adapt. Continuous bridge construction, you can set up the main
beam-by-hole into a simply supported beam and then connected to a continuous beam. Or
from the pier on the stage of a piecemeal overhang the lengthening of the last connection to
be the continuous beam. For nearly a decade, the erection of prestressed concrete beams,
successfully adopted incremental construction, i.e. in bridge end (or both) on the making of
a piecemeal continuous embankment of piecemeal, so that the top to bridge construction is
more convenient. Continuous bridge girders of positive and negative moment, structure is
more complex. In addition, continuous girder bridge girder is indeterminate
structure, substructure of uneven settlement will cause the internal force of the hole.Therefore, continuous beams are generally used for ground conditions, span large bridges.
Built in the United States in 1966 kajasto Leah bridge, is currently the largest span steel truss
bridge, its span to 376 m. Prestressed concrete bridge in China's development and
application of although only 20 year history, but now in road and City Road and railway
construction. At present our country in terms of design, construction, prestressed materials
and equipment are made much progress and success, however, and the international level
there is a certain gap. Today, we need to continually experience, lessons learned, in design
theory, design specifications, materials and construction techniques of the prestressed on
evolving and growing, to be creative. Believe that through our concerted efforts, in the 21st
century will be our prestressed concrete bridge design and construction standards to update
the height.
The content of this design is the bridge design of suzhou highway project.There are
four bridge types which to be selected in the design process.They are prestressed concrete
Continuous bridge, tied arch bridge ，T-frame bridge and Simple beam bridge. Prestressed
concrete Continuous bridge is chosen to be the best one.
The bridge is designed by Ⅲ fairways,.It is a variable cross-section continuous girder
bridge with 70m of the main span.For box-section beam, side-middle-of-span ratio (0.5～0.7);
With the request of cantilever construction, the side span is 50 m. For the two independent
bridge span structure, every single bridge’s section is single-room box beam. For high
deformation curve continuous girder bridge, the fulcrum beam high H is 4.5m, cross-beam
high of middle span is 2.5m. Beam end of curve; from the internal forces distribution and
the aesthetic point of view, we choose the second parabolic curve as the curve of the end of
the beam. We select 8 cm thick waterproof concrete as pavement layer and 5cm layer of
asphalt concrete wear as deck pavement. 12 bored piles with the diameter of 1.5m is used in
Bridge pier foundation. The height of Cap is 2.5. In order to alleviate water impact on the pier
cap, the edge of two caps is arc-like.
The structure is pided into 143 elements.The computer program is used to calculate the