Static structures (e.g. – buildings) – Means compensating earth-transmitted force
Patent
1996-11-19
1998-07-21
Friedman, Carl D.
Static structures (e.g., buildings)
Means compensating earth-transmitted force
254106, 521674, 5274517, E02D 2734
Patent
active
057820430
ABSTRACT:
A system is provided for relieving the downwardly acting load on a structural column, such as a reinforced concrete column supporting a roadway, bridge, overpass, or other massive structure. Horizontally oriented keyways are formed into the concrete column on transversely opposite sides thereof and at the same elevation thereon. The keyways are of rectangular cross section. Clamps likewise having vertical bearing surfaces and keys that extend horizontally with a corresponding rectangular cross section are clamped against the transversely opposite sides of the columns so that keys project into the keyways. A load bearing support system is positioned beneath the clamps. The bolts are torqued to tighten the clamps and hydraulic jacks are inserted in between the lowermost clamps and the load-bearing support structure to exert vertically upwardly acting forces against the clamps. These vertical forces counter the load on the column, thereby preloading the column. This reduces the vertically downwardly acting load on the column beneath the level of the clamps so that the base of the column can be retrofitted to withstand major seismic events.
REFERENCES:
patent: 3101184 (1963-08-01), Allen et al.
patent: 3468514 (1969-09-01), Vaessen
patent: 3565400 (1971-02-01), Yamuru
Duncan C. Warren
Meehan Richard G.
Friedman Carl D.
Horton-Richardson Yvonne
Thomas Charles H.
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