CSI ETABS - 03 - Wind Loads, Exposure from Extents of Diaphragms & Exposure Shell Objects | Part 4

In this lecture ,Wind Loads are discussed with two methods (i) Exposure from Extents of Diaphragms and (ii) Exposure from Shell Objects

Detailed: Exposure and Pressure Coefficients options. Choose an option to define these coefficients:

(i) Exposure from Extents of Rigid Diaphragms option: If this option is selected, provide values for the Wind Direction Angle, Windward Coeff. and Leeward Coeff. This option allows the same wind load to be applied each time the load case is assigned.

(ii) Exposure from Shell Objects options. If this option is selected, the Wind Exposure Parameters area becomes inactive. In that case, use the Assign menu --) Shell Loads --) Wind Pressure Coefficients command to specify the windward and leeward coefficients when the wind load is assigned to a shell object. This option allows wind load coefficients and wind direction to be applied on an object-by-object basis.

(iii)Exposure from Frame and Shell Objects options (This option only Present in Old Version): If ASCE 7-02 is selected as the Auto Lateral Load on the Define Load Patterns form, this area is added to the Wind Load Pattern - {Code} form. When this option is selected, choose to apply loads to Shell Objects, or Frame Objects (Open Structure), or both. This allows specification of wind loading on open structures [i.e., choose the Include Frame Objects (Open Structure) option only]. With an option(s) selected, specify the parameters in the Wind Coefficients area on the form.

Wind Exposure Parameters
For Coefficients Consult the code you follow...
UBC 1997 ,BOCA, NBCC, NBCC , IBC/ ASCE 7-10 ,NEHRP , Chinese , NZS 1170.5 ,Eurocode ,Indian IS:1893 ,Italian NTC ,Turkish Seismic Code
(TSC) ,Korean Building Code
(KBC) , Korean Building Code (KBC)

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