Although shaker tables capable of very high payloads have been reported (e.g., a test object…

Although shaker tables capable of very high
payloads have been reported (e.g., a test object capacity of 1000 tons, table
size 15 m × 15 m, three translational and three rotational degrees of freedom,
testing frequency range 0 to 30 Hz, stroke 0.2 m, velocity 0.75 m·s–1
for the shaker table in Tadotsu Island, Japan), it is quite difficult to carry
out shaker-table tests on large civil engineering structures (buildings,
bridges, etc.). Several other testing procedures are also employed in testing
large test objects. One approach is to make use of natural excitations (e.g.,
aerodynamic forces) and monitor the response of the structure at several
locations. Another is to excite the structure using several portable exciters
(shakers) at strategic locations and directions (degrees of freedom), assuming
that each exciter has its own controller in generating the excitation. If this
second approach could be carried out quite accurately, there would not be a
need for large-scale table testing. Clearly, there are difficulties that limit
the use of multiple shakers in large-scale testing. Discuss some of these
potential problems.

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