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Steel Truss Bridge Description:
Introduction of the steel truss bridge:
The steel truss bridge is a structural system between beams and arches. It is a structure
in which a bent upper beam structure and a pressure-bearing lower
column are integrated together. Due to the rigid connection between
the beam and the column, the beam is unloaded due to the flexural
rigidity of the column. The entire system is a compression-bending
structure as well as a thrust structure.
According to the different position of the bridge floor, it is
divided into upper bearing steel truss bridge that the bridge floor
is located in the upper part of the main truss and lower bearing
steel truss bridge which the bridge floor is located in the lower
part of the main truss.
The structure composition of rigid truss beam bridge: Main girder,
Bracing, Bridge deck system, Bridge floor
(1) Main girder
It is the main load-bearing structure and bears vertical loads.
The main truss is composed of upper chord, lower chord and belly rod. The belly bar is divided into diagonal bar and vertical bar.
Nodes are divided into large nodes and small nodes.
Pitch refers to the distance between nodes.
(2) Bracing
1. Classification: longitudinal connection and horizontal
connection.
2. Function: Connect the main truss, make the bridge span structure
become a stable space structure that can withstand a variety of
lateral loads.
3. The longitudinal connection system is divided into upper
horizontal longitudinal connection system and lower horizontal
longitudinal connection system. The main function is to withstand
the transverse horizontal load, transverse wind, lateral rocking
force and centrifugal force acting on the bridge span structure. In
addition, the transverse support chord, reducing its free length
outside the plane.
4. The transverse connection is divided into bridge frame and
crosslink. The main function is to increase the torsional stiffness
of steel girder. Properly adjust the uneven force of the two main
stringer or two longitudinal links.
(3) Bridge deck system
1. Composition: the longitudinal beam, beam and the connection
between the longitudinal beam.
2. Way of force transmission: the load first acts on the
longitudinal beam, and then from the longitudinal beam to the beam,
and then from the beam to the main truss.
(4) Bridge deck
The bridge deck is the part for vehicles and pedestrians to walk
on. The form of the deck is similar to that of steel beam Bridges
and combined beam bridges.
Geometric characteristics of the main truss:
Economy, simple structure, conducive to standardization and easy to
manufacture and install.
The main truss categories:
Triangular truss: Triangular truss structure is simple, the design
is fixed, easy to install and manufacture.
Diagonal bar truss:
Many bar specifications.
Many specifications and large internal force of the vertical rod.
All are large nodes.
The K-shaped truss:
The shear force of the same node is borne by two diagonal rods,
which are small and short in section.
The bar has many specifications, many nodes, short intersections,
and many crossbar beams and connections. For small and medium-sized
spans, the structure is complex.
For large spans, the rods are short, light and suitable for
mounting and dismounting Bridges.
Double-vented bar truss:
The same internode shear force is borne by two diagonal rods, which
are small and short in section.
It is used for large span, short compression inclined rod, which is
favorable for buckling stability.
The small section of the inclined rod makes the number of
connecting pins on the joint plate less, and it is easy to arrange
the joint.
Advantages of the steel truss bridge:
Ease of Inspection and Maintenance: Steel truss bridges generally offer easy access for inspection and maintenance activities. The open truss structure allows for visual inspection of the individual members, facilitating the identification of potential issues. Maintenance and repair tasks can be performed more efficiently due to the accessibility of the structural elements, resulting in reduced maintenance costs and extended bridge service life.
Sustainable Material: Steel is a highly recyclable material, and
the use of steel truss bridges promotes sustainability in bridge
construction. Steel components can be recycled at the end of a
bridge's life, reducing the need for new raw materials and
minimizing waste generation. The energy efficiency of steel
production processes further enhances the environmental benefits of
steel truss bridges.
Application of the steel truss bridge:
The application of steel truss bridges is diverse and depends on
factors such as span length, load requirements, site conditions,
and architectural considerations. They are valued for their
strength, durability, and aesthetic appeal, making them a popular
choice for various bridge construction projects.
Evercross Steel Bridges Overview :
EVERCROSS STEEL BRIDGE SPECIFICATION | ||
EVERCROSS STEEL BRIDGE | Bailey bridge(Compact-200, Compact-100, LSB, PB100, China-321,BSB) Modular bridge( GWD, Delta, 450-type,etc), Truss Bridge,Warren bridge, Arch bridge, Plate bridge,Beam bridge,Box girder bridge, Suspension bridge,Cable-stayed bridge, Floating bridge,etc | |
DESIGN SPANS | 10M TO 300M Single span | |
CARRIAGE WAY | SINGLE LANE, DOUBLE LANES,MULTILANE,WALKWAY,ETC | |
LOADING CAPACITY | AASHTO HL93.HS15-44,HS20-44,HS25-44, BS5400 HA+20HB,HA+30HB, AS5100 Truck-T44, IRC 70R Class A/B, NATO STANAG MLC80/MLC110. Truck-60T,Trailer-80/100Ton,etc | |
STEEL GRADE | EN10025 S355JR S355J0/EN10219 S460J0/EN10113 S460N/BS4360 Grade 55C AS/NZS3678/3679/1163/Grade 350, ASTM A572/A572M GR50/GR65 GB1591 GB355B/C/D/460C,etc | |
CERTIFICATES | ISO9001, ISO14001,ISO45001,EN1090,CIDB,COC,PVOC,SONCAP,etc | |
WELDING | AWS D1.1/AWS D1.5 AS/NZS 1554 or equivalent | |
BOLTS | ISO898,AS/NZS1252,BS3692 or equivalent | |
GALVANIZATION CODE | ISO1461 AS/NZS 4680 ASTM-A123, BS1706 or equivalent |