Earthquake resistant tank

A stationary tank of improved structural integrity for the storage of liquids or solids adapted to withstand forces acting upon the side walls thereof under earthquake conditions, including a concrete base;

• a vertically-positioned cylindrical side wall;
• and a plurality of tendons, wherein each of said tendons is affixed to an upper part of said cylindrical side wall at a connection, said connections being spaced from one another in equal angular increments around the circumference of the tank, and wherein each tendon is also anchored in said concrete base at angular increments around the circumference of said tank and at a position displaced radially inwardly of said cylindrical side wall, said tendons serving to restrain said side walls from horizontal displacement and to mitigate the vertical stresses caused by earthquake conditions.

A stationary storage tank of improved structural integrity for the storage of cryogenic liquids adapted to withstand forces acting upon the side walls thereof under earthquake conditions, comprising a concrete base;

• a vertically-positioned, cylindrical side wall of prestressed concrete upon said base;
• a roof;
• and a plurality of tendons, each of said tendons being stressed and being connected at one end to an upper part of said cylindrical side wall and at the other end to an anchor fixedly positioned in said concrete base, wherein said anchors are positioned radially inwardly of said connection between tendon and side wall, said tendons serving to restrain said side walls from horizontal displacement and to mitigate the vertical stresses caused by earthquake conditions.

A stationary tank of improved structural integrity for the storage of liquids or solids and adapted to withstand forces acting upon the side walls thereof under earthquake conditions, including a base;

• a vertically-positioned cylindrical side wall;
• and a plurality of tendons, each tendon being stressed and each tendon being affixed at one end to said cylindrical side wall at a point a vertical predetermined distance from said base substantially less than the height of said cylindrical side wall, and at the other end to an anchor fixedly positioned in said base at a position radially displaced from said side wall so that said tendons each slope generally radially and downwardly from said side wall to said anchor and the stress in each tendon has a radial as well as a vertical component to restrain said side walls from horizontal displacement and to mitigate the vertical stresses caused by earthquake conditions.