Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

LOAD COMBINATION-WIND LOAD 3

Status
Not open for further replies.
Rsayed PE

Rsayed PE

Structural
Joined
Jan 9, 2020
Messages
23
Location
US
I am using ASCE7-10 and ASCE7-16. and usually I use ASD Load combination

Wind Load is always multiplied by 0.6

Question:

I am multiplying the qz(velocity pressure) x 0.6 to get q asd

does that mean that I cannot multiply the wind load pressure by 0.6 while doing the load combination ? or will be multiplied twice ?

 
Sort by date Sort by votes
What is qasd? Don't think I've seen that one before. Can you provide a reference to the applicable section in 7-10?

The velocity pressure is rarely applied directly to the structure. There is typically another factor applied to it depending on the type and shape of structure and the type of wind loading you're considering.
 
Upvote 0 Downvote
I am converting the Velocity pressure to ASD before adding the pressure coefficients which depends on the shape and size of the building as you mentioned. I am doing so since the Velocity mentioned in ASCE7-10 and ASCD7-16 is V ultimate .

Long story short, I convert the ultimate wind pressure to service wind pressure while doing the wind pressure calculations.

as an example we will take one of the code ASD Load combination equation 2.4.1.7 0.6D+0.6W

which Wind load will I use in the above equation ? working or ultimate ?
 
Upvote 0 Downvote
The 0.6W in ASCE load combinations is meant to be used with ultimate wind pressure. It is incorrect to calculate an ASD wind pressure prior to using the load combinations.

DaveAtkins
 
Upvote 0 Downvote
I agree with Dave and Celt. You shouldn't be applying a 0.6 "ASD" factor to the wind load. Calculate the wind load as the procedures in the code direct you to (which will give you an ultimate wind load), and then add it to the load combination (which will give you an ASD or LRFD/Strength load as desired). Don't mix and match combinations from one code and loads from another.
 
Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

Superstar123
  • Question Question
Reduced Wind Load for Wind and Ice Combination
Replies
1
Views
7K
FenceEng
F
dik
  • Question Question
Wind Load
Replies
11
Views
12K
SnTMan
SnTMan
T
  • Question Question
Differential settlement, thermal load in load combination
Replies
1
Views
2K
canwesteng
canwesteng
M
  • Locked
  • Question Question
Load Combination for Overturning due to Live Load
Replies
3
Views
4K
TRAK.Structural
TRAK.Structural
M
  • Question Question
Wind load on balcony glazing
Replies
1
Views
3K
Almudena
A

Part and Inventory Search

Sponsor

Back
Top