Painted Steel Structure Bridge Q355B Metal Pedestrian Bridge

Painted Steel Structure Bridge/steel Structure Pedestrian Bridge

If you notice any of the following signs on a bridge, it may indicate that the bridge needs repair or maintenance:

1. **Cracks in Concrete and Steel Components**
- **Concrete Cracks**: Look for longitudinal, transverse, or diagonal cracks in concrete. These can be caused by shrinkage, thermal changes, corrosion of reinforcement, or excessive loading.
- **Steel Cracks**: Inspect steel components for cracks, especially in areas with high stress concentrations like welds and joints.

2. **Corrosion of Steel Components**
- **Rust Stains and Surface Pitting**: Visible rust stains or pitting on steel components are clear indicators of corrosion.
- **Ultrasonic Thickness Testing**: This can measure the remaining thickness of steel members to identify significant corrosion.

3. **Spalling of Concrete**
- **Surface Deterioration**: Look for flaked or broken-off chunks of concrete, often near abutments and piers.
- **Exposed Rebar**: Exposed steel reinforcement with visible rust is a sign of advanced spalling.

4. **Scour, Erosion, and Settlement**
- **Depth Sounding**: Use sonar or depth measurement tools to detect scour around bridge piers.
- **Tilting Piers**: Uneven piers or abutments suggest settlement.

5. **Fatigue in Steel Members**
- **Non-Destructive Testing (NDT)**: Techniques like ultrasonic testing can detect early signs of fatigue cracking in steel members.
- **Visual Inspection**: Focus on welds and joints for hairline fractures.

6. **Deck Deterioration**
- **Surface Wear and Cracks**: Look for cracking, potholes, or worn-out areas on the bridge deck.
- **Deflection Measurements**: Excessive deflection under load indicates structural weakening.

7. **Joint Deterioration and Failures**
- **Water Leakage**: Water leaking through joints indicates sealant failure.
- **Excessive Movement**: Misalignment or excessive movement between bridge segments suggests joint failure.

8. **Bearing Wear and Deterioration**
- **Visual Inspection**: Check for corrosion, debris buildup, or wear on bearing components.
- **Movement Restrictions**: Restricted movement of the bridge deck can indicate bearing failure.

9. **Efflorescence**
- **Visual Detection**: White, powdery deposits on concrete surfaces indicate efflorescence, which may suggest moisture problems.

10. **Other Signs**
- **Foundation Scouring**: Look for signs of sediment removal around bridge foundations, which can undermine stability.
- **Cracks in Concrete Substructures**: Vertical or horizontal cracks in piers or abutments may indicate foundation issues or excessive loads.

What to Do Next
If you observe any of these signs, it is crucial to report them to the relevant bridge maintenance authority or transportation department immediately. Timely inspection and repair can prevent further damage and ensure the safety and longevity of the bridge.

Specifications:

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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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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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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