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CFC Galvanizing Grating has been fabricated in stict accordance to N.A.A.M.M.(National Association of Architectural Metal-Manufactures)specification and high quality governec by TQC system. The following is the production flow.
⓵ Automatic high-voltage welding
⓶ Automatic cutting
⓷ Robotic edge banding and frame welding
⓸ Hot dip galvanized
⓹ Final ahipment
A. Consideration of Load
Explanation:
HS 20-44 represents a three-axle trailer with a total weight of 36 metric tons. Due to its weight distribution across three axles, its load rating is equivalent to the HS 20-44 truck (total weight of 20 metric tons) and both fall under the T20 category.
HS 15-44 represents a three-axle trailer weighing 25 metric tons. For the same reasons mentioned above, its load rating is equivalent to the HS 15-44 truck (total weight of 14 metric tons), and both fall under the T-14 category. For further details on load ratings, please refer to the Highway Bridge Design Code.
B. Consideration of Vehicle Direction
Even with the same load, the force distribution varies depending on the direction of the vehicle and the main beam (I-beam). Therefore, it is important to consider whether the vehicle is moving in a parallel or perpendicular direction to the main beam.
C. Strength Calculation Examples
1. General Side Trench Cover
- Standard Type：I50*400*995
- Rear Wheel Load：P=8000kg(T-20)
- Ground Contact Area：a 20cm* b 50cm
- Impact Coefficient：i=0
- Support Spacing：L=30cm(溝距span)
- Allowable Stress：σ b=18kgf / m㎡
- Direction：Perpendicular to the main beam (side trench)
- Main Beam Spacing：35.3cm
- Number of Main Beams Distributing Load：
n=(a 20cm / 3.53cm)+1支=6支piece - Cross-Sectional Area of the Main Beam：Z=2.57cm³
- Type：I-50
- Stress：
σ=P*(L / b)*L／ 8*n*Z=8000*(30/50)*30
／8*6*2.57
=1,167=11.7kgf/mm²<σ b
2. General Fixed Trench Cover
- Standard Type：I50*400*995
- Rear Wheel Load：P=5600kg(T-14)
- Ground Contact Area：a 20cm* b 50cm
- Impact Coefficient：i=0.4
- Support Spacing e：L=35cm(溝距span+5cm)
- Allowable Stress：σ b=18kgf / m㎡
- Direction: Parallel to the main beam (transverse trench)
- Main Beam Spacing：35.3cm
- Number of Main Beams Distributing Load：
n=(b 50cm / 3.53cm)+1支=15支piece - Cross-Sectional Area of the Main Beam：Z=2.57cm³
- Type：I-50
- Stress：
σ=P*(1+i)*(2L-a)／ 8*n*Z=5600*(1+0.4)*(2*35-20)
／8*6*2.57
=1,271=12.7kgf/mm²<σ b
