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Experimental Seismic-Performance Evaluation of Isolation/Restraint Systems for Mechanical Equipment
Part 2: Light Equipment Study

by S. Fathali and A. Filiatrault

This report describes shake table experiments on an air-handling unit in two different configurations: supported by six isolation/restraint systems and rigidly-mounted. The testing included seismic and system-identification tests, and incorporated different input-motion amplitudes and different isolation/restraint system properties. Experimental results showed that limiting the displacement of the equipment by the restraint components of the isolation/restraint systems resulted in amplification of the equipment acceleration responses. Based on these results, reducing the gap size is recommended to improve the seismic performance of these systems in areas of high seismicity. The test results also showed that higher amplification of acceleration responses should be expected for light and flexible equipment than for rugged and heavy equipment. A companion report, MCEER-07-0007, focuses on heavy mechanical equipment.

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