Generation of critical and compatible seismic ground acceleration time histories for high-tech facilities

Hong, Xiao; Xu, You‐Lin

doi:10.12989/sem.2007.26.6.687

Cited by 2 publications

(3 citation statements)

References 11 publications

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“…where subscript l(= a or d) denotes either acceleration or drift response, S l and S lf are the power spectral functions of the platform and building floor responses, respectively; S g is the ground motion spectrum derived from design response spectra specified in the seismic design codes [9]. H l ( ) is the corresponding frequency response function of the concerned building floor, which can be obtained from the finite element model.…”

Section: Parameters Of Passive Platformmentioning

confidence: 99%

“…The acceleration responses are controlled in this study not to exceed a safety threshold of 0.1g during earthquakes to ensure that no damage occurs to the high-tech equipments. The three-dimensional seismic ground motion compatible with the design response spectrum specified in Chinese seismic design code is generated using the method proposed by Hong and Xu [9]. This artificial earthquake ground motions with peak accelerations equal to 0.11, 0.085, 0.064g along the x-, y-and z-directions, respectively, are applied to the coupled passive platform-building system to examine the control performance of the passive platform.…”

Section: Seismic Response Control With Passive Platformmentioning

confidence: 99%

“…In consequence, some phenomena might be overlooked or some structural responses may be underestimated. For example, the significant mass eccentricity due to additional high-tech equipment may cause torsional vibration of buildings during earthquakes [9]. Moreover, Hong and Xu [10] studied the ground motions induced by nearby roadway traffic, which involves the effect of both Raleigh wave and body wave, and the results reveal that the floor vibration level of high-tech buildings may surpass the allowable tolerance specified by ultra-precision industry in all three directions (x-, y-and z-directions).…”

Section: Introductionmentioning

confidence: 99%

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Three‐dimensional vibration control of high‐tech facilities against earthquakes and microvibration using hybrid platform

Hong

Zhu

2009

Earthq Engng Struct Dyn

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High-tech equipments engaged in the production of ultra-precision products have very stringent vibration criteria for their functionality in normal operation conditions and their safety during an earthquake. Most previous investigations were based on simplified planar models of building structures, despite the fact that real ground motions and structures are always three-dimensional. This paper hence presents a threedimensional analytical study of a hybrid platform on which high-tech equipments are mounted for their vibration mitigation. The design methodology of the hybrid platform proposed in this study is based on dual-level performance objectives for high-tech equipments: safety against seismic hazard and functionality against traffic-induced microvibration. The passive devices (represented by springs and viscous dampers) and the active actuators are designed, respectively, to meet vibration criteria corresponding to safety level and functionality level. A prototype three-story building with high-tech equipments installed on the second floor is selected in the case study to evaluate the effectiveness of the hybrid platform. The optimal location of the platform on the second building floor is determined during the design procedure in terms of the minimal H 2 cost function of absolute velocity response. The simulation of the coupled actuator-platformbuilding system subjected to three-dimensional ground motions indicates that the optimally designed hybrid platform can well achieve the dual target performance and effectively mitigate vibration at both ground motion levels.

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Section: Parameters Of Passive Platformmentioning

confidence: 99%

Section: Seismic Response Control With Passive Platformmentioning

confidence: 99%