Static structures (e.g. – buildings) – Means compensating earth-transmitted force – Relative motion means between a structure and its foundation
Patent
1986-08-22
1987-10-06
Perham, Alfred C.
Static structures (e.g., buildings)
Means compensating earth-transmitted force
Relative motion means between a structure and its foundation
521697, 52245, E04H 902, E02D 2738
Patent
active
046973958
ABSTRACT:
Unanchored fluid storage tanks rely primarily on the weight of fluid resting on an uplifted portion of the base plate to balance seismically induced overturning moments. Local uplift is therefore necessary to develop the resisting moment. This has often resulted in buckling and other damage. These problems are reduced or eliminated by inserting a ring filler under the tank wall, so that the base plate is partly preuplifted. The weight of fluid resting on the preuplifted portion of the base plate can contribute to the resisting moment without any additional uplift of the tank wall. It is shown by static analysis and by experiment that preuplift significantly improves the lateral load capacity of unanchored tanks.
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"Failure of Liquid Storage Tanks Due to Earthquake Excitation", by Choon-Foo Shih California Institute of Technology, Earthquake Engineering Research Laboratory, CIT Report No. EERL81-04, 1981.
"Matrix Analysis of Shell Structures", by Stanley Klein, Massachusetts Institute of Technology, Department of Aeronautics, ASRL-TR-121-12, 1964.
"Computerized Analysis of Shells--Governing Equations", by David Bushnell, Lockheed Palo Alto Research Laboratory, Applied Mechanics Laboratory, Technical Report AFWAL-81-3048, 1981.
CBI Standard 541-1, Shimming, Grouting, and Sealing Tanks on Concrete Foundations," p. 21, Nov. 60 (Rev. Mar. 81).
"AWWA D100-84 Standard" Welded Steel Tanks, pp. 44-45, date unknown.
California Institute of Technology
Perham Alfred C.
Wylie Paul R.
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