huangyhg

wind loading
when applying lateral wind loads to a building using the simplified method, how do you determine whether you have windward and leeward loading on the vertical surfaces of the building. asce states that the horizontal loading on the vertical surfaces is the addition of windward and leeward forces (zones a, b, c, & d as shown on fig 6-2 in asce 7-02). this is for buildings that are 60 ft and less. any help would be greatly appreciated.
you have to account for both. there will always be windward and leeward pressures acting together on the building when the wind blows. the simplified method gives you the net combination of these pressures for your mwfrs in fig. 6-2.
did i understand your question correctly?
as rholder98 indicated, these are net pressures. they have already been calculated and shown in fig 6-2, page 42. generally the wall pressures (winward & leeward) are added because they are in the same direction. one pushing and one pulling. it's the roof that the wind pressure direction changes. that is because of its slope (pitch) and bldg height/width ratios).
hope this hepled.
keep in mind that there is a difference when designing the main wind force resisting system and designing the components and cladding. it seems like the simplified method relates to the main wind force resisting system design so you will be designing for that total load in either diirection.

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