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the high-tech fabs. Result indicatre that the retrofit effect by the bracing
system is limited while the metallic yielding damper is more effectiveas it
provides stiffness reinforcement and energy dissipation simultaneously.
However, due to constraint of the existing spaces, metallic yielding
dampers are allowed to be installed only in the peripheral frames.
Therefore, the seismic capacity in the direction of minor axis direction is
still insufficient after retrofit, indicating improvement of the overall
structural system of the double fab is requiled to ensure its seismic
capacity.
In regard to AGV/RGV induced floor microvibration analysis of
high-tech fabs, the main contents of this study include :( 1 )
characterization of AGV induced, either in motion or braking, floor
vibration in the clean room;(2)retrofit of floor rigidity and its performance
assessment;and(3) assessment of the floor dynamic stiffness.
Simulation results indicate that, vehicle speed (constant velocity/ brake),
car loading and structural span are all influential to floor vibration
response. When AGV advances at a constant but lower speed (1m/s or
1.5m/s ), the floor vibration are more pronounced in the first and third
modes, while at a higher speed (3m/s or 6m/s), responses of high
frequency modes are excited.
Braking may amplify floor vibration in a
certain bandwidth, mainly in the low frequency range. Moreover,
increase of both car loading and structural span cause further vibration
amplification to the floor. To resolve the problem of excessive floor
vibration, this study proposes three retrofit strategies of local floor
reinforcement using aluminum truss. It is seen that the broader area of
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