Prefabricated Steel Bridges/weathered Steel Bridge
Load Capacity of Type 321 Bailey Bridge
Type 321 Bailey Bridge is a prefabricated steel bridge widely used in various engineering scenarios, with high load capacity and fast construction. The following is the specific load capacity of Type 321 Bailey Bridge:
1. **Design Load**
Type 321 Bailey Bridge is suitable for a variety of load levels, as follows:
- **Automobile Load**: Applicable to Auto-10, Auto-15, Auto-20.
- **Track Load**: Able to carry crawler load of 50 tons.
- **Trailer Load**: Able to carry trailer-80.
2. **Specific Parameters**
- **Single-piece Bailey Beam**:
- Allowable bending moment (MX): 782 kN-m.
- Allowable shear force (QX): 242 kN.
- **Combined bridge**:
- Single-layer single row (SS): allowable bending moment 78.82 T.m, allowable shear force 24.52 T.
- Double-layer double row (DS): allowable bending moment 157.64 T.m, allowable shear force 49.04 T.
- Three-row single layer (TS): allowable bending moment 224.637 T.m, allowable shear force 69.882 T.
- Double-row double layer (DD): allowable bending moment 326.54 T.m, allowable shear force 49.05 T.
- Three-row double layer (TD): allowable bending moment 465.32 T.m, allowable shear force 69.89 T.
3. **Actual application case**
In actual application, the 321 type Bailey bridge can meet the traffic needs of various heavy vehicles. For example, in a certain project, 321-type Bailey bridges were used as the main beams, with a 6-row single-layer top-bearing structure and a designed traffic load of 100 tons.
Summary
The 321-type Bailey bridge can meet the traffic needs of a variety of heavy vehicles due to its high load-bearing capacity, rapid assembly and disassembly, and strong adaptability. Its design loads include car-10, car-15, car-20, crawler-50, and trailer-80, making it an ideal choice for various complex engineering needs.
Specifications:
| 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 |
| 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 |
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
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