Wind Load Calculations Chimneys, Stack and Vertical Tanks per ASCE 7.02

Program Description:

"ASCE798W" is a spreadsheet program written in MS-Excel for the purpose of wind loading analysis for buildings

and structures per the ASCE 7-98 Code. Specifically, wind pressure coefficients and related and required

parameters are selected or calculated in order to compute the net design wind pressures.

Worksheet Name Description

Stacks & Tanks Analysis of cantilevered chimneys, stacks, and vertical tanks

Wind Map Basic wind speed map (Figure 6-1 of ASCE 7-98 Code)

Program Assumptions and Limitations:

1. This program assumes only enclosed or partially enclosed buildings. Open buildings are NOT considered.

2. Worksheet for Simplified analysis is applicable for buildings meeting the criteria of Section 6.4.1.

3. In the worksheet for Simplified analysis, the design MWFRS wind load is calculated for each direction.

This design load is assumed equal to 1/2 of the total load, as 1/2 is assumed to be taken at roof level and

the other 1/2 is taken at the base of the building.

4. Worksheet for MWFRS (Low-Rise) is applicable for low-rise buildings as defined in Section 6.2.

5. Worksheets for MWFRS (Any Ht.), Wall C&C, and Roof C&C are applicable for buildings with mean roof

heights of up to 500 feet.

6. Worksheet for Stacks & Tanks is applicable for cantilevered structures up to 600 feet tall.

7. Worksheets for Wall C&C and Roof C&C are applicable for flat roof buildings, gable roof buildings with roof

angles <= 45 degrees, and monoslope roof buildings with roof angles <= 3 degrees.

8. Worksheets for MWFRS (Any Ht.) and for Stacks & Tanks can handle “rigid” as well as “flexible” buildings

and structures. For “rigid” buildings or structures, this program uses the smaller value of either 0.85 or the

calculated value from Section 6.5.8.1 of the Code for the gust effect factor, 'G'. For “flexible” buildings or

structures, this program calculates the gust effect factor, ‘Gf’, per Section 6.5.8 of the Code based on the

assumed formula for the fundamental period of vibration from Section 9.5.3.3 of the Code.

9. This program uses the equations listed in the reference, “Guide to the Use of the Wind Load Provisions"

[COLOR=#333333][FONT=Verdana]Online calculator here:[/FONT][/COLOR]

[U][B][URL="http://www.engineersedge.com/civil_engineering/wind_load_simplecube/wind_loading_analysis_simple_building.htm"]Wind Loading Building Any Height[/URL][/B][/U]