How do you calculate uplift?
In my book, uplift would be the difference between the actual and the anticipated, related to the anticipated. Assuming seasonality equally effects all markets (by multiplying by 2), the anticipated value of group A is 10, so lift is (5-10)/10=-0.5 (or -50%). For group B, (15-20)/20=-0.25 (or -25%).
How do you calculate wind suction?
Armed with pressure and drag data, you can find the wind load using the following formula: force = area x pressure x Cd. Using the example of a flat section of a structure, the area – or length x width – can be set to 1 square foot, resulting in a wind load of 1 x 25.6 x 2 = 51.2 psf for a 100-mph wind.
How do you calculate effective wind area?
Height * Height / 3 spaced closely together the effective wind area can be ’rounded out’ and may be taken as height X height / 3 (H*H/3) (height or length of the component multiply by one third of the height or length of the component).
How is design wind pressure calculated?
Calculate wind pressure. Wind pressure is given by the equation P = 0.00256 x V2, where V is the speed of the wind in miles per hour (mph). The unit for wind pressure is pounds per square foot (psf). For example, if the wind speed is 70 mph, the wind pressure is 0.00256 x 702 = 12.5 psf.
What is the minimum wind load for a mwfr?
Per Code Section 6.1.4.1, the minimum wind load to be used in the design of the MWFRS shall not be less than 10 psf multiplied by the area of the building or structure projected onto a vertical plane normal to the assumed wind direction.
What does mwfrs stand for in construction code?
The code says that MWFRS is ” an assemblage of structural elements assigned to provide support and stability for the overall structure. The system generally receives wind loading from more than one surface”. Although this isn’t the clearest definition, I think that this puts a column supporting roof trusses and a roof girder as MWFRS.
Is it mwfrs or C & C in structural engineering?
This, in my opinion, means that the column should be designed for MWFRS not C & C. The code says that MWFRS is ” an assemblage of structural elements assigned to provide support and stability for the overall structure. The system generally receives wind loading from more than one surface”.
How are mwfrs different from components and cladding?
Think of MWFRS as ‘what happens to the balloon’ – it could slide, fly up, or flip over in wind. We look at the unit and consider effects as a whole. Components & cladding considers the effects of smaller ‘bursts’ of wind that occur in any given part of the building, not paying attention to the structure as a whole.
