Customized specifications for steel formwork: What factors need to be considered in calculating the weight of steel formwork?

1、 Material attribute factors
Steel density
There is a significant difference in density among different materials:
The density of Q235 steel is 7.85g/cm ³, while the density of high-strength steel Q345 may increase to 7.87-7.91g/cm ³ due to alloy composition
Stainless steel (such as 304) has a density of 7.93g/cm ³ and requires special labeling of the material model
Thickness deviation
The thickness tolerance caused by the rolling process needs to be compensated for:
The actual thickness of 6mm steel plate may be 5.75-6.25mm, and the theoretical weight needs to be corrected according to the measured average value
2、 Structural design parameters
Key points for calculating the weight of component types
Panel area=length x width, weight=area x thickness x density
Strengthen the calculation of ribbed channel steel/I-beam according to the profile formula, for example:
text
Copy Code
-Weight of I-beam=(web height x web thickness+flange width x flange thickness x 2) x 0.00785 x length: ml-citation{ref="11,13" data="citationList"}  
-Weight of angle steel=width x thickness x 0.015 x length (Q345C angle steel): ml citation {ref="12" data="cityList"}|
|Connecting piece | Weld metal is calculated based on the overlap area multiplied by the depth of fusion, and bolts and nuts are accumulated based on the number of pieces|
3、 Additional impact of process
Forming process
The unfolded length of the bent steel plate requires an increase in arc length compensation. The relationship between the arc radius R and the plate thickness t is as follows:
When R ≤ 5t, the correction coefficient for neutral layer offset is taken as 0.33
Punching template needs to deduct hole area (deducted when single hole>0.3m ²)
Surface treatment
The weight gain of galvanized layer is calculated as 30-50g/m ², and the weight gain of spray painting is about 5-8g/m ²
4、 Application scenario correction coefficient
Security redundancy
Bridge and other high load scenarios require 5-8% weight redundancy, corresponding to strength enhancement design
Transportation billing standards
Road transportation is charged based on gross weight (theoretical weight+packaging material weight), with packaging tare weight typically accounting for 0.5-1.2%
Example calculation:
The size of a Q235 steel formwork panel is 2m × 1m × 8mm, including 3 10 # channel steel reinforcement ribs (each 2m long):
Panel weight: 2 × 1 × 0.008 × 7850=125.6kg
Weight of channel steel: 100mm × 48mm × 5.3mm Specification Single weight 10kg/m, total weight 3 × 2 × 10=60kg
Total weight=125.6+60=185.6kg (excluding connectors)
Note: BIM software is required for 3D modeling and weight verification in actual engineering, and the error can be controlled within ± 1.5%.