Hi All
Reference tank design for seismic to AWWA D103 standard:
I'm a bit puzzled trying to understand the wording included in the above standard under Section 14: Seismic Design.
It says:
"The design design seismic forces have been reduced by a factor of 1.4 and shall be used with the allowable strength design method".
This reduction is applied in the formula for calculating the design acceleration, A, which is used to determine the lateral forces for overturning moments and base shear. In that formula (Eq. 14-16) which is generally written as
A = S*I/R
where
S is the spectral response acceleration
I is the importance factor
R is the Response modification factor depending on type of structure and extent of anchorage
The "A" is reduced by a factor of 1.4
My question is that in API-650 which has a similar design procedure, the reduction factor of 1.4 is not included.
I believe both AWWA D103 and API-650 both use the allowable strength design method.
Could this be explained by those more familiar with the above codes.
Thanks
Michael
Reference tank design for seismic to AWWA D103 standard:
I'm a bit puzzled trying to understand the wording included in the above standard under Section 14: Seismic Design.
It says:
"The design design seismic forces have been reduced by a factor of 1.4 and shall be used with the allowable strength design method".
This reduction is applied in the formula for calculating the design acceleration, A, which is used to determine the lateral forces for overturning moments and base shear. In that formula (Eq. 14-16) which is generally written as
A = S*I/R
where
S is the spectral response acceleration
I is the importance factor
R is the Response modification factor depending on type of structure and extent of anchorage
The "A" is reduced by a factor of 1.4
My question is that in API-650 which has a similar design procedure, the reduction factor of 1.4 is not included.
I believe both AWWA D103 and API-650 both use the allowable strength design method.
Could this be explained by those more familiar with the above codes.
Thanks
Michael
