Static structures (e.g. – buildings) – Means compensating earth-transmitted force – Relative motion means between a structure and its foundation
Patent
1987-11-19
1988-12-27
Murtagh, John E.
Static structures (e.g., buildings)
Means compensating earth-transmitted force
Relative motion means between a structure and its foundation
52 1, E04H 902, E04B 136
Patent
active
047931051
ABSTRACT:
A system for protecting a building against the forces generated by an earthquake. The superstructure moves horizontally along a system of movable plates provided at the interface between the superstructure and the foundation. A sandwiched system of three levels of low friction plates lying beneath each column, interconnected by a system of clamps, restricts the movement of the columns and walls solely to a combination of orthogonal, rectilinear motions. A first set of clamps allow linear motion between the top and middle plate in a first direction and a second set of clamps allow linear motion between the middle and bottom plate in a second linear direction that is perpendicular to the first direction without torsional rotation about a vertical axis. By setting a low friction material under the top plate concentric with the column center line, no significant eccentric loads can be introduced into the column. Vertical uplift tensile forces are also significantly controlled by hold-down arms or flanges provided on the clamps.
REFERENCES:
patent: 3638377 (1972-02-01), Caspe
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