ASCE 7, Section 15.7.6: Calculation of value of Ti
ASCE 7, Section 15.7.6: Calculation of value of Ti
(OP)
I'm working on a ground supported storage tank that must consider the hydrodynamic effects for seismic design. I need some guidance on a couple of things.
(1) How to calculate the fundamental period of the tank structure and impulsive component of content, Ti
(2) How to determine the impulsive weight, Wi
(3) How to determine the portion of liquid weight sloshing, Wc
Thanks, in advance, for any help with this problem.
(1) How to calculate the fundamental period of the tank structure and impulsive component of content, Ti
(2) How to determine the impulsive weight, Wi
(3) How to determine the portion of liquid weight sloshing, Wc
Thanks, in advance, for any help with this problem.






RE: ASCE 7, Section 15.7.6: Calculation of value of Ti
It was a while ago, but I think google searches relating to these codes turned up a couple of examples of petroleum tank design that included these calculations and were very thorough.
RE: ASCE 7, Section 15.7.6: Calculation of value of Ti
ACI 350.3R Seismic Design of Liquid Containing Concrete Structures.
PCA's Design of Liquid-Containing Concrete Structures for Earthquake Forces
These are specifically for concrete tanks. The ACI document that I have is 2001 and is still based on 94 UBC type seismic loading. It doesn't look to me as if ACI has updated the document. Though I would tend to believe that the concept of splitting the liquid mass into convective vs impulsive components would not change much based on tank material. The PCA document seeks to convert the ACI formulas into more IBC type seismic loading.
RE: ASCE 7, Section 15.7.6: Calculation of value of Ti
RE: ASCE 7, Section 15.7.6: Calculation of value of Ti
of API or AWWA without spending a fortune? Or maybe someone could post the equations I need.
Thanks!