Grid framework structure

An earthquake restraint grid framework structure comprising:

• a grid framework structure configured for supporting a load handling device operative to move one or more containers in a stack;
• a series of intersecting grid members arranged to form a grid having a plurality of substantially rectangular frames in a horizontal plane, each of the substantially rectangular frames constituting a grid cell, said grid being supported by a plurality of upright columns at each of the intersections of the series of intersecting grid members to form a plurality of vertical storage locations for containers to be stacked between the upright columns and be guided by the upright columns in a vertical direction through the plurality of substantially rectangular frames, each of the upright columns having a hollow center section;
• and
• an exoskeleton having a plurality of vertical frame columns, the vertical frame columns being solid supports, braced by at least one bracing member, said grid being further supported by the exoskeleton to form a seismic restraint system (SFRS).