OEM Steel Truss Bridge ASTM GB BS BV Standard 4.2m 7.35m Width

Steel Bridge (pavement)/steel Structure Bridge Maker

The environmental impacts of using steel in bridges are multifaceted, with both positive and negative aspects:

Positive Environmental Impacts

1. **High Recyclability**:
   - Steel is the most recycled construction material, with virtually 100% of steel scrap being recycled instead of sent to landfills. New steel for bridges often contains recycled steel, reducing the environmental footprint.
   - When a steel bridge reaches the end of its useful life, its components can be recycled or reused, ensuring minimal waste.

2. **Durability and Long Lifespan**:
   - Modern steel bridges have a longer lifespan due to improved corrosion resistance, reducing the frequency of maintenance and rehabilitation projects that can impact air quality and sensitive environments.

3. **Lightweight and Efficient**:
   - Steel’s lightweight nature allows for less foundation work, reducing the environmental impact associated with excavation, transportation, and disposal of materials.
   - The ability to support longer spans means fewer bridge piers, minimizing the impact on wildlife and sensitive areas.

4. **Energy Efficiency**:
   - Off-site production in modern fabrication plants minimizes waste and reduces the overall energy consumption associated with bridge construction.

5. **Aesthetic and Design Flexibility**:
   - Steel offers broad architectural possibilities, allowing for aesthetically pleasing designs that can be adapted to various environments.

 Negative Environmental Impacts

1. **Energy Consumption and CO2 Emissions**:
   - Steel production is energy-intensive and generates significant carbon emissions, with nearly 1.4 tons of CO2 produced per ton of steel. However, advancements in steel production technologies are helping to reduce this impact.

. **Corrosion and Maintenance**:
   - While steel is durable, it is still susceptible to corrosion, especially in harsh environments. Proper coating systems are essential to prevent rust and extend the bridge’s lifespan.

### Conclusion
Steel bridges offer significant environmental advantages due to their recyclability, durability, and lightweight nature. However, the energy consumption associated with steel production and the need for corrosion protection must be managed through sustainable practices and advanced technologies. Overall, steel remains a highly sustainable choice for bridge construction when considering its full lifecycle.

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