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Descripción: Design Guidelines for Tall Buildings
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Assignment No. 1: Wind Load Analysis by UBC
Tall Buildings
Assignment Assignment No.1 (Wind load analysis By UBC) By B y Afzal Waseem for Ryerson University Data on Design Problem (Wind load analysis) My Serial No = 33 Nature of Building: Hospital Building Stories: 15 + 33 = 48 Stories Exposure condition: open terrain
Scattered obstructions but also includes shoreline in hurricane prone region Typical story height: 10ft (3.05m) 2 Bottom floors height: 15ft (4.6m) Building height: (2x15) + (46x10) = 490 ft (149.4 m) Basic wind speed V = 100 mph Building width = 80 ft Design wind pressures and floor by floor lateral force f or lateral load analysis of the building. Find the wind load distribution and the total base shear. (USE UBC)
DESIGN The Uniform Building Code is a Static method that assumes the building to be a fi xed rigid body in the wind. This method is appropriate for mid-sized buildings, which are neither particularly slender nor susceptible to vibrations under high winds Design wind pressure “p” is obtained from formula:
Ce = a coefficient that accounts for the combined effects of height, exposure and gusting; Cq = a coefficient that allowing for higher pressures for wall and roof elements; for example, C q has a value of 1.4 when using the projected area method of calculating the wind loading for structures over 40 ft in height, whereas it has a local value of 2.0 at wall corners. qs = wind stagnation pressure for a minimum basic 50 -year wind speed at a height of 30ft above ground, as given for different regions of the United States in a wind speed contour map. I = Importance factor taken as 1.15 for post-disaster buildings and 1.00 for all other buildings. Calculation of qs
= Density of air = 0.0765pcf Although at higher altitudes the value of air density should be reduced but UBC does not consider its effect in calculations. v = velocity of wind = 100mph The formula becomes
Assignment No. 1: Wind Load Analysis by UBC
Tall Buildings
h/w = 490/80 = 6.1 > 5 and h= 490ft > 400ft 400ft UBC directs the users to adopt the standards like ASCE 7-02 for the design of such types of structures. Calculating the Ce factor
Ce = Kz x Gh Ce = Gust factor coefficient Kz = Velocity exposure coefficient Gh = Gust response factor. Exposure C: Scattered obstructions but also includes shoreline in hurricane prone region
The values of Ce is usually calculated from the following table but my height is greater than 400ft so it’s not included in the below table.
The chart did not provided values beyond 400 m so I approximated the values in calculations.
Assignment No. 1: Wind Load Analysis by UBC
Pressure coefficient Cq
Walls
Cq for windward wall = 0.8 inwards Cq for Leeward wall = 0.5 outwards Roof
