Prefabricated Highway Steel Bridge/reinforced Steel Structure Bridge

Ductility is a critical property of steel that significantly impacts the lifespan of bridges. Here’s how ductility affects bridge longevity:

1. **Energy Absorption and Redistribution**
Ductile materials can absorb and redistribute energy from dynamic loads such as wind, earthquakes, and traffic. This ability helps prevent sudden failures and ensures that the bridge can withstand extreme conditions without catastrophic collapse.

2. **Fatigue Resistance**
Bridges are subjected to repetitive loading, which can lead to fatigue failure over time. Ductile steel can deform slightly under cyclic loading without developing critical cracks, enhancing the bridge’s durability and lifespan.

3. **Corrosion Resistance**
Ductile steel, especially when combined with corrosion-resistant alloys or coatings, can significantly reduce the risk of corrosion. Corrosion can weaken steel components over time, reducing their ability to support loads. High-quality steel with enhanced ductility and corrosion resistance helps maintain the bridge’s structural integrity.

4. **Repairability**
Ductile steel can be repaired more easily than brittle materials. In the event of damage, ductile steel components can be reshaped or welded without losing their structural integrity. This repairability extends the bridge’s lifespan and reduces maintenance costs.

5. **Long-term Durability**
Bridges made from ductile steel can last significantly longer than those made from less ductile materials. For example, stainless steel bridges can last over 100 years with minimal maintenance. Even in highly corrosive environments, such as coastal areas, ductile steel bridges can maintain their structural integrity.

6. **Flexibility in Design**
Ductility allows for more flexible design options, enabling engineers to create bridges with longer spans and more complex geometries. This flexibility can lead to more efficient use of materials and reduced construction costs.

Conclusion
The ductility of steel is essential for extending the lifespan of bridges. It enhances their ability to absorb and redistribute stresses, resist fatigue, and withstand corrosive environments. By choosing high-quality, ductile steel, engineers can design bridges that are not only strong and durable but also cost-effective and easier to maintain.

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