Galvanized Steel Frame Bridge With High Strength / Customized Steel Structure Bridge

Steel Frame Bridge With High Strength/customized Steel Structure Bridge

Steel's ductility plays a crucial role in bridge design, particularly in ensuring the structural integrity and safety of the bridge. Ductility refers to the ability of a material to deform under tensile stress without fracturing. Here’s how ductility impacts bridge design:

1. **Energy Absorption**
Ductile materials can absorb and dissipate energy during deformation. This property is particularly important in bridges, as it allows the structure to absorb and redistribute the energy from dynamic loads such as wind, earthquakes, and heavy traffic. This energy absorption helps prevent sudden failure and ensures that the bridge can withstand extreme conditions without catastrophic collapse.

2. **Redistribution of Stresses**
Ductility allows steel to deform plastically under stress, which helps redistribute stresses within the structure. In the event of localized overloading or damage, ductile materials can deform rather than fracture, preventing the propagation of cracks and allowing the structure to maintain its overall stability. This is particularly important in areas prone to seismic activity or where the bridge may experience sudden impacts.

3. **Fatigue Resistance**
Bridges are subjected to repetitive loading, which can lead to fatigue failure over time. Ductile materials are more resistant to fatigue because they can deform slightly under cyclic loading without developing critical cracks. This ability to withstand repeated stress cycles without failure is essential for the long-term durability and safety of the bridge.

4. **Design Flexibility**
Ductility allows for more flexible design options. Engineers can design bridges with thinner sections and longer spans, knowing that the material will deform rather than fail under stress. This flexibility enables more efficient use of materials and can lead to cost savings in construction.

5. **Safety Margin**
Ductile materials provide a safety margin in design. In the event of an unexpected overload or structural damage, ductile steel can deform significantly before failing, providing time for intervention or evacuation. This safety margin is crucial for ensuring the safety of bridge users and the surrounding environment.

6. **Weldability and Fabrication**
Ductile steel is easier to weld and fabricate, which is important for the construction of complex bridge structures. The ability to form and join steel components without causing brittleness or cracking ensures that the bridge can be assembled with high precision and reliability.

Conclusion
The ductility of steel is a critical factor in bridge design, providing essential safety features and enhancing the bridge's ability to withstand various types of loading and environmental conditions. By choosing ductile steel, engineers can design bridges that are not only strong and durable but also capable of absorbing and redistributing stresses, ensuring long-term safety and reliability.

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