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CB100
Galvanized bridges are steel bridges treated with a hot-dip galvanization process, a protective coating that shields steel from rust and corrosion—making them ideal for harsh environments like coastal areas, wetlands, or regions with heavy rain and snow. Unlike uncoated steel bridges that require frequent painting and maintenance, galvanized bridges leverage zinc’s sacrificial protection to extend lifespans, reduce upkeep costs, and maintain structural integrity over decades.
The key to galvanized bridges lies in the hot-dip galvanization process. Steel bridge components—such as truss panels, girders, and decking supports—are submerged in a bath of molten zinc (at around 450°C). This creates a metallurgical bond between zinc and steel, forming a thick, uniform coating (typically 85–120 microns) with three layers: a zinc-iron alloy inner layer, a zinc-iron intermetallic layer, and a pure zinc outer layer. This coating acts as a barrier, preventing moisture, salt, and chemicals from reaching the steel. Even if the coating is scratched, zinc sacrifices itself to corrode first (a process called cathodic protection), stopping rust from spreading to the steel beneath.
Galvanized bridges excel in corrosive environments. Coastal regions, where saltwater spray and high humidity accelerate steel decay, benefit greatly—galvanized components resist salt-induced corrosion up to 50 times longer than uncoated steel. In wetlands or areas with acidic soil, the zinc coating protects against soil-borne chemicals that would erode traditional steel. For example, galvanized pedestrian bridges in coastal parks or wetland nature reserves often remain rust-free for 30–50 years with minimal maintenance, compared to 10–15 years for uncoated steel bridges.
Beyond durability, galvanized bridges offer practical advantages. The galvanization process is completed in factories, ensuring consistent coating quality before components reach the construction site—reducing on-site delays and errors. The coating’s smooth, silver finish also has aesthetic appeal, blending with natural landscapes or urban settings without the need for additional paint. Maintenance is simple too: occasional cleaning with water is enough to remove dirt and salt buildup, eliminating the need for costly repainting cycles.
While galvanized bridges have a slightly higher upfront cost than uncoated steel models, their long lifespan and low maintenance costs make them more economical over time. They are widely used for pedestrian bridges, small vehicle crossings, and temporary modular bridges (like galvanized Bailey bridges), where reliability and resistance to the elements are critical.
Galvanized bridges prove that with the right protective treatment, steel can thrive in even the harshest conditions. They balance durability, cost-effectiveness, and practicality, delivering long-lasting connectivity for communities and environments that demand resilience.
| 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 |
Galvanized bridges are steel bridges treated with a hot-dip galvanization process, a protective coating that shields steel from rust and corrosion—making them ideal for harsh environments like coastal areas, wetlands, or regions with heavy rain and snow. Unlike uncoated steel bridges that require frequent painting and maintenance, galvanized bridges leverage zinc’s sacrificial protection to extend lifespans, reduce upkeep costs, and maintain structural integrity over decades.
The key to galvanized bridges lies in the hot-dip galvanization process. Steel bridge components—such as truss panels, girders, and decking supports—are submerged in a bath of molten zinc (at around 450°C). This creates a metallurgical bond between zinc and steel, forming a thick, uniform coating (typically 85–120 microns) with three layers: a zinc-iron alloy inner layer, a zinc-iron intermetallic layer, and a pure zinc outer layer. This coating acts as a barrier, preventing moisture, salt, and chemicals from reaching the steel. Even if the coating is scratched, zinc sacrifices itself to corrode first (a process called cathodic protection), stopping rust from spreading to the steel beneath.
Galvanized bridges excel in corrosive environments. Coastal regions, where saltwater spray and high humidity accelerate steel decay, benefit greatly—galvanized components resist salt-induced corrosion up to 50 times longer than uncoated steel. In wetlands or areas with acidic soil, the zinc coating protects against soil-borne chemicals that would erode traditional steel. For example, galvanized pedestrian bridges in coastal parks or wetland nature reserves often remain rust-free for 30–50 years with minimal maintenance, compared to 10–15 years for uncoated steel bridges.
Beyond durability, galvanized bridges offer practical advantages. The galvanization process is completed in factories, ensuring consistent coating quality before components reach the construction site—reducing on-site delays and errors. The coating’s smooth, silver finish also has aesthetic appeal, blending with natural landscapes or urban settings without the need for additional paint. Maintenance is simple too: occasional cleaning with water is enough to remove dirt and salt buildup, eliminating the need for costly repainting cycles.
While galvanized bridges have a slightly higher upfront cost than uncoated steel models, their long lifespan and low maintenance costs make them more economical over time. They are widely used for pedestrian bridges, small vehicle crossings, and temporary modular bridges (like galvanized Bailey bridges), where reliability and resistance to the elements are critical.
Galvanized bridges prove that with the right protective treatment, steel can thrive in even the harshest conditions. They balance durability, cost-effectiveness, and practicality, delivering long-lasting connectivity for communities and environments that demand resilience.
| 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 |
