Static structures (e.g. – buildings) – Means compensating earth-transmitted force – Relative motion means between a structure and its foundation
Patent
1987-08-17
1990-03-27
Ridgill, Jr., James L.
Static structures (e.g., buildings)
Means compensating earth-transmitted force
Relative motion means between a structure and its foundation
52573, E04B 198
Patent
active
049109294
ABSTRACT:
Disclosed is an added damping and stiffness structural element for use in optimizing the design of buildings and structures subjected to earthquake, wind or other forces that induce vibratory oscillations in buildings or structures. The added damping and stiffness element comprises conventional structural engineering materials having high shear, tension and compression moduli for transferring force from one point in a structure to another point that experience relative displacement during vibratory motion of the building or structure, and viscoelastic polymers or rubber material having lower compression, tension, and shear moduli than the structural component and also having high energy dissipation properties that absorb the majority of the strain deformation that occurs between the two points of the structure. In addition, this teaching includes the elucidation of the engineering design process which incorporates added damping and stiffness elements to optimize the earthquake response performance of structures. Specifically, the added damping and stiffness element or a plurality of the added damping and stiffness elements are placed at strategic locations in buildings or structures in such a way as to achieve two engineering design process objectives: (1) provide controlled deformation and stiffness in structures to increase the non-damaging cyclic energy capacity of structures, and (2) to increase damping in structures thereby reducing and/or minimizing the cyclic earthquake energy demand on structures. While the added damping and stiffness element is generally applicable for wind induced vibrations, earthquake induced vibrations, and vibrations induced by other types of forces, this teaching is directed primarily at earthquake vibration response design optimization.
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Roger E. Scholl, Brace Dampers: An Alternative Structural System for Improving the Earthquake Performance of Buildings, presented at 8WCEE, Jul. 1984, San Francisco, pp. 1-8.
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