What is the difference between ULS Wind and SLS Wind?
Environment
British Standard
ULS Wind uses coefficients from BS6399:2 Table 5 and should be used for all strength checks.
SLS Wind uses coefficients from BS6399:2 Table 5A and can be used for serviceability checks.
If you wish to use SLS wind (Table 5A) you should create a combination with ULS wind and select to perform just ULS checks, then create a matching combination with SLS wind and select to perform just SLS checks. Below is a suggested order of the steps to take to resolve problems with deflection under wind - note at any point you may decide to change you section sizes etc:
ULS Wind
ULS Wind + SLS Base Fixity
ULS Wind + SLS Base Fixity + SCI AD 277 combination factors
ULS Wind + SLS Base Fixity + SCI AD 277 combination factors + cl 2.1.3.6
SLS Wind
SLS Wind + SLS Base Fixity
SLS Wind + SLS Base Fixity + SCI AD 277 combination factors
SLS Wind + SLS Base Fixity + SCI AD 277 combination factors + cl 2.1.3.6
All this is discussed on our Portal Frame training course
SLS Wind uses coefficients from BS6399:2 Table 5A and can be used for serviceability checks.
If you wish to use SLS wind (Table 5A) you should create a combination with ULS wind and select to perform just ULS checks, then create a matching combination with SLS wind and select to perform just SLS checks. Below is a suggested order of the steps to take to resolve problems with deflection under wind - note at any point you may decide to change you section sizes etc:
ULS Wind
ULS Wind + SLS Base Fixity
ULS Wind + SLS Base Fixity + SCI AD 277 combination factors
ULS Wind + SLS Base Fixity + SCI AD 277 combination factors + cl 2.1.3.6
SLS Wind
SLS Wind + SLS Base Fixity
SLS Wind + SLS Base Fixity + SCI AD 277 combination factors
SLS Wind + SLS Base Fixity + SCI AD 277 combination factors + cl 2.1.3.6
All this is discussed on our Portal Frame training course