Steel Frame Bridge With High Strength/customized Steel Structure
Bridge
Steel's ductility plays a crucial role in bridge design,
particularly in ensuring the structural integrity and safety of the
bridge. Ductility refers to the ability of a material to deform
under tensile stress without fracturing. Here’s how ductility
impacts bridge design:
1. **Energy Absorption**
Ductile materials can absorb and dissipate energy during
deformation. This property is particularly important in bridges, as
it allows the structure to absorb and redistribute the energy from
dynamic loads such as wind, earthquakes, and heavy traffic. This
energy absorption helps prevent sudden failure and ensures that the
bridge can withstand extreme conditions without catastrophic
collapse.
2. **Redistribution of Stresses**
Ductility allows steel to deform plastically under stress, which
helps redistribute stresses within the structure. In the event of
localized overloading or damage, ductile materials can deform
rather than fracture, preventing the propagation of cracks and
allowing the structure to maintain its overall stability. This is
particularly important in areas prone to seismic activity or where
the bridge may experience sudden impacts.
3. **Fatigue Resistance**
Bridges are subjected to repetitive loading, which can lead to
fatigue failure over time. Ductile materials are more resistant to
fatigue because they can deform slightly under cyclic loading
without developing critical cracks. This ability to withstand
repeated stress cycles without failure is essential for the
long-term durability and safety of the bridge.
4. **Design Flexibility**
Ductility allows for more flexible design options. Engineers can
design bridges with thinner sections and longer spans, knowing that
the material will deform rather than fail under stress. This
flexibility enables more efficient use of materials and can lead to
cost savings in construction.
5. **Safety Margin**
Ductile materials provide a safety margin in design. In the event
of an unexpected overload or structural damage, ductile steel can
deform significantly before failing, providing time for
intervention or evacuation. This safety margin is crucial for
ensuring the safety of bridge users and the surrounding
environment.
6. **Weldability and Fabrication**
Ductile steel is easier to weld and fabricate, which is important
for the construction of complex bridge structures. The ability to
form and join steel components without causing brittleness or
cracking ensures that the bridge can be assembled with high
precision and reliability.
Conclusion
The ductility of steel is a critical factor in bridge design,
providing essential safety features and enhancing the bridge's
ability to withstand various types of loading and environmental
conditions. By choosing ductile steel, engineers can design bridges
that are not only strong and durable but also capable of absorbing
and redistributing stresses, ensuring long-term safety and
reliability.
Specifications:
| CB321(100) Truss Press Limited Table |
| No. | Lnternal Force | Structure Form |
| Not Reinforced Model | Reinforced Model |
| SS | DS | TS | DDR | SSR | DSR | TSR | DDR |
| 321(100) | Standard Truss Moment(kN.m) | 788.2 | 1576.4 | 2246.4 | 3265.4 | 1687.5 | 3375 | 4809.4 | 6750 |
| 321(100) | Standard Truss Shear (kN) | 245.2 | 490.5 | 698.9 | 490.5 | 245.2 | 490.5 | 698.9 | 490.5 |
| 321 (100) Table of geometric characteristics of truss bridge(Half
bridge) |
| Type No. | Geometric Characteristics | Structure Form |
| Not Reinforced Model | Reinforced Model |
| SS | DS | TS | DDR | SSR | DSR | TSR | DDR |
| 321(100) | Section properties(cm3) | 3578.5 | 7157.1 | 10735.6 | 14817.9 | 7699.1 | 15398.3 | 23097.4 | 30641.7 |
| 321(100) | Moment of inertia(cm4) | 250497.2 | 500994.4 | 751491.6 | 2148588.8 | 577434.4 | 1154868.8 | 1732303.2 | 4596255.2 |
| CB200 Truss Press Limited Table |
| NO. | Internal Force | Structure Form |
| Not Reinforced Model | Reinforced Model |
| SS | DS | TS | QS | SSR | DSR | TSR | QSR |
| 200 | Standard Truss Moment(kN.m) | 1034.3 | 2027.2 | 2978.8 | 3930.3 | 2165.4 | 4244.2 | 6236.4 | 8228.6 |
| 200 | Standard Truss Shear (kN) | 222.1 | 435.3 | 639.6 | 843.9 | 222.1 | 435.3 | 639.6 | 843.9 |
| 201 | High Bending Truss Moment(kN.m) | 1593.2 | 3122.8 | 4585.5 | 6054.3 | 3335.8 | 6538.2 | 9607.1 | 12676.1 |
| 202 | High Bending Truss Shear(kN) | 348 | 696 | 1044 | 1392 | 348 | 696 | 1044 | 1392 |
| 203 | Shear Force of Super High Shear Truss(kN) | 509.8 | 999.2 | 1468.2 | 1937.2 | 509.8 | 999.2 | 1468.2 | 1937.2 |
| CB200 Table of Geometric Characteristics of Truss Bridge(Half
Bridge) |
| Structure | Geometric Characteristics |
| Geometric Characteristics | Chord Area(cm2) | Section Properties(cm3) | Moment of Inertia(cm4) |
| ss | SS | 25.48 | 5437 | 580174 |
| SSR | 50.96 | 10875 | 1160348 |
| DS | DS | 50.96 | 10875 | 1160348 |
| DSR1 | 76.44 | 16312 | 1740522 |
| DSR2 | 101.92 | 21750 | 2320696 |
| TS | TS | 76.44 | 16312 | 1740522 |
| TSR2 | 127.4 | 27185 | 2900870 |
| TSR3 | 152.88 | 32625 | 3481044 |
| QS | QS | 101.92 | 21750 | 2320696 |
| QSR3 | 178.36 | 38059 | 4061218 |
| QSR4 | 203.84 | 43500 | 4641392 |
Advantage
Possessing the features of simple structure,
convenient transport, speedy erection
easy disassembling,
heavy loading capacity,
great stability and long fatigue life
being capable of an alternative span, loading capacity
