BLDG 6071 - PROJECT - SUMMER 2011

Comparison of the American and Canadian Methods of Wind Load

Calculations for Low-Rise and High-Rise (Tall) BuildingsWind Engineering and Building Aerodynamics

By: Mohamad Meneeim ID#: 6175163Sherif Hafez ID#: 9787143

Professor: Dr. T. Stathopoulos

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.

Purpose

Location of the Low Rise Buildings

Location of the High Rise Buildings

Low RiseElevation Views

High RiseElevation Views

Directional Procedure:◦ Part 1: All Heights◦ Part 2: Simplified h<160 ft

Envelope Procedure Wind Tunnel Procedure

ASCE 7-10 Methods

Low Rise Wind Pressure Distribution

High Rise Wind Pressure Distribution

Without converting 3-sec gust to 1-hour mean speed:

◦ VAmerican Code = 2.00 VCanadian code ◦ V2

American Code= 4.00 V2Canadian Code

Converting 3-sec gust to 1-hour mean:◦ VAmerican Code = 1.38 VCanadian code ◦ V2

American Code= 1.69 V2Canadian Code

Comparison

Static Procedure Dynamic procedure Experimental procedure

Canadian Code Wind Calculation Procedure

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

Low Rise Wind Load Calculation

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

Low Rise Static Procedure – Wind Pressures Structural Components and Cladding

Determination of external wind pressure Pe = IwqCeCgCp

Determination of internal wind pressure Pi = IwqCeCiCi

Low Rise Static Procedure – Wind Pressures Structural Components and Cladding

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

Low Rise Static Procedure – Wind Pressures on Building Structure

Determination of external wind pressure Pe = IwqCeCgCp

Low Rise Static Procedure – Wind Pressures on Building Structure

Low Rise Wind Load Distribution

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

High Rise Wind Load Calculation

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

High Rise Static Procedure – Wind Pressures Structural Components and Cladding

Determination of external wind pressure Pe = IwqCeCgCp

Determination of internal wind pressure Pi = IwqCeCiCi

High Rise Static Procedure – Wind Pressures Structural Components and Cladding

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

High Rise Static Procedure – Wind Pressures on Building Structure

Determination of external wind pressure Pe = IwqCeCgCp

High Rise Static Procedure – Wind Pressures on Building Structure

High Rise Wind Load Distribution