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88. SEISMIC PERFORMANCE OF LIGHT FRAMED WOOD STRUCTURES WITH TOGGLE-BRACED FLUID DAMPERS

In recent years, seismic damping systems have been employed in numerous steel and concrete framed buildings. Such systems dissipate a significant portion of the seismic input energy, thereby relieving the energy dissipation demand on the structural framing system and thus reducing damage. As part of a NEESR project to develop a performance based approach to seismic design of multi-story light framed wood structures, the application of damping systems to such structures has been evaluated via seismic shaking table tests and numerical simulations. This paper focuses on the results from shaking table tests of shear walls employing toggle braced fluid dampers. The results demonstrate that toggle braced fluid dampers provide a significant increase in the seismic resistance of the walls, allowing them to achieve high levels of performance when subjected to strong ground motions.

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12. PASSIVE AND ACTIVE FLUID DAMPERS IN STRUCTURAL APPLICATIONS

Analytical and experimental results demonstrate that the performance improvements from active control systems can also be achieved with passive and semi-active fluid dampers. However, passive or semi-active fluid dampers offer the advantages of low cost, no or minimal demand for external power, longevity and reliability.

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15. REDUCTION OF SHOCK RESPONSE SPECTRA USING VARIOUS TYPES OF SHOCK ISOLATION MOUNTS

This experiment demonstrated how various types of shock absorbers can reduce the overall shock response spectra of a structure subjected to high impact shock. This was accomplished by measuring the acceleration on a weight dropped onto three different shock absorbers from various heights and analyzing the resulting data. A baseline test was performed with a steel hard mount. This was followed by tests with three different soft isolation mounts; a half inch thick neoprene pad, a urethane rubber tube on its side and a hydraulic liquid spring type shock absorber. Results show that both the dominant frequencies and the peak acceleration get lower as the isolation system gets softer. This information can be valuable in the design of isolation systems.

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Case Study

16. ROCKWELL VISCOUS DAMPER SPECIFICATIONS

This specification covers the set of ten linear fluid viscous dampers along with their mounting brackets and pins for the Rockwell Building located at Jamboree Road and Birch in Newport Beach, California. These dampers provide an output force in either tension of compression that is directly proportional to the relative velocity between the two ends of the dampers. The damper output force varies only with velocity and does not change with damper stroke position or orientation angle. The function of the dampers is to absorb earthquake energy, thereby reducing the amount the building moves when an earthquake occurs.

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