Loads on falsework
The vertical loads applied on falsework are defined as per below
| DL | The minimum self-weight of the formwork: \(DL = 0.48 kPa\) or \(10 psf\) |
| LL | Weight of workers, tool and equipment: \(LL = 1.9 kPa\) or \(40 psf\) When concrete placing is done with motorized equipment or for heavy civil construction (bridge, subways and tunnels): \(LL = 3.1 kPa\) or \(65 psf\). |
| C | Concrete density: \(\rho_c = 24 \frac{kN}{m^3}\) or \(150 \frac{lb}{ft^3}\) Concrete weight: \(C = \rho_ch\) where h is the concrete depth Minimum concrete weight: \(C = 2.4 kPa\) or \(50 psf\) (equivalent to a 100mm depth of concrete) |
The horizontal loads applied on falsework are defined as per below
| W | The wind load can’t be less than recommended by the National Building Code of Canada (NBC) with 1/50 probability, gust factor of 2 and reduction factor of 0.75 for falsework erected during less than 2 years. |
| H | The greater force between 2% of the total vertical loads or \(H = 1.46 \frac{kN}{m}\) or \(100 \frac{lb}{ft}\) applied at the slab edge |
| E | Because of the temporary nature of the structures; seismic, rain and snow loads are in general neglected |
Loads on formwork
The horizontal loads applied on formwork are defined as per below
| W | The wind load can’t be less than recommended by the National Building Code of Canada (NBC) with 1/50 probability, gust factor of 2 and reduction factor of 0.75 but not less than \(W = 0.8 kPa\) or \(16.5 psf\) Clause 5.5.2 |
| P | Wall form up to 1.2m high must be design for full liquid head pressure. From this clause we can assume any wall, higher than 1.2m should be design for minimum \(P=\rho_c\times h=28.8kPa\) or \(600 psf\) where \(h=1.2m\). Clause 5.5.3.3.1.3.2 |
| P | For formwork 3m above ground or within 3m for an open edge must be design for minimum \(P = 48 kPa\) or \(1000 psf\). Clause 5.5.3.3.1.3.3 |