Wind Load Calculations Comparison between The NBCC and ASCE

1. Wind Engineering and Building Aerodynamics
By: Mohamad Meneeim ID#: 6175163
Sherif Hafez ID#: 9787143
Professor: Dr. T. Stathopoulos
BLDG 6071 - PROJECT - SUMMER
2011

2.  The purpose of this project is to determine
the similarities and differences in the
American and Canadian methods of wind load
calculations using the appropriate guidelines
and the available procedures for each case.

7.  Directional Procedure:
◦ Part 1: All Heights
◦ Part 2: Simplified h<160 ft
 Envelope Procedure
 Wind Tunnel Procedure

10.  Without converting 3-sec gust to 1-hour
mean speed:
◦ VAmerican Code = 2.00 VCanadian code
◦ V2American Code= 4.00 V2Canadian Code
 Converting 3-sec gust to 1-hour mean:
◦ VAmerican Code = 1.38 VCanadian code
◦ V2American Code= 1.69 V2Canadian Code

11.  Static Procedure
 Dynamic procedure
 Experimental procedure

12.  Building Basic Characteristics:
• H/W < 4.
• No susceptible vibrations.
• H ≤ 20m.

13.  Determination of the importance factor Iw
 Calculating Reference Velocity Pressure q
 Calculating the Exposure Factor Ce
 Verified H ≤ 20 – low rise
 Calculating CpCg on different structural
components and cladding.
 Calculating Cgi
 Calculating Cpi

14.  Determination of external wind pressure
Pe = IwqCeCgCp
 Determination of internal wind pressure
Pi = IwqCeCiCi

15.  Verified H ≤ 120, H/W ≤ 4, and no
susceptible to vibrations.
 Calculating the Exposure Factor Ce
 Verified H ≤ 20 m, and H/Ds < 1
 Calculating CpCg in different wind directions.
 Determination of wind external pressure Pe

16.  Determination of external wind pressure
Pe = IwqCeCgCp

18.  Building Basic Characteristics
• High rise H > 20m.
• No susceptible vibrations.
• H/W < 4.

19.  Determination of the importance factor Iw
 Calculating Reference Velocity Pressure q
 Calculating the Exposure Factor Ce
 Verified H > 20 – High rise
 Calculating CpCg on different structural
components and cladding.
 Calculating Cgi
 Calculating Cpi

20.  Determination of external wind pressure
Pe = IwqCeCgCp
 Determination of internal wind pressure
Pi = IwqCeCiCi

21.  Verified H ≤ 120, H/W ≤ 4, and no
susceptible to vibrations.
 Calculating the Exposure Factor Ce
 Verified H > 20 m, and H/Ds > 1
 Determining Cg . it is 2.0 in our case because
it is a flat terrain.
 Determining Cp.
 Determination of wind external pressure Pe

22.  Determination of external wind pressure
Pe = IwqCeCgCp