Erection Of Steel Bridges/types Of Steel Bridge

Load-bearing capacity of Type 200 Bailey Bridge

The design load-bearing capacity of Type 200 Bailey Bridge can meet the traffic needs of various heavy vehicles. The following are the specific technical parameters and applicable loads:

1. **Design load**
- **Automobile load**: Type 200 Bailey Bridge is suitable for automobile-10, automobile-20, HS15, and HS20 load designs.
- **Track load**: It can carry a crawler load of 50 tons.
- **Special vehicles**: When special loads need to pass, the Type 200 Bailey Bridge can pass a maximum load of 60 tons per vehicle.

2. **Specific parameters**
- **Single lane bridge deck clear width**: 4.2 meters.
- **Dual lane bridge deck clear width**: 7.4 meters.
- **Combined span range**:
- Single lane: 9.14 meters to 76.2 meters. - Two-lane: 9.14m to 57.9m.

3. **Technical improvements**
The Type 200 Bailey Bridge has undergone a number of improvements in design and structure to improve its load-bearing capacity and stability:

- **Truss height**: 2.134m, higher than the 1.76m of the Type 321, providing greater structural strength and stability.

- **Connection method**: The joints between the reinforcing chords and the joints between the trusses are staggered to reduce the inelastic deformation caused by the pin hole gap, and the pre-arch method is used to reduce the vertical deflection of the bridge mid-span.

- **Bolt connection**: The guide sleeve positioning and fixing method is used to improve the connection accuracy and the service life of the bolts.

- **Wind-resistant tie rod**: Made into an integral type and connected to the crossbeam, it improves the overall stability of the bridge.

Summary
The Type 200 Bailey Bridge can meet the traffic needs of a variety of heavy vehicles with its high load-bearing capacity, flexible design and structural improvements. Its design loads include automobile-10, automobile-20, HS15, HS20, and crawler loads of 50 tons, and it can even pass special vehicles with a maximum load of 60 tons per vehicle. These features make it an ideal choice for various complex engineering requirements.

Specifications:

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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

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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

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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

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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