Abstract
Equation of motion for an equipment-structure-soil (ESS) interaction system was derived using the branch substructure method. After rearrangement, this equation was applied to real-time dynamic substructuring shaking table (RTDSST) testing of the ESS system. This method adopts the equipment-structure (ES) subsystem as the experimental substructure and a modal reduced soil model as the numerical substructure: the former is tested via the shaking table, and the latter is numerically simulated, while real-time data communication occurs between the two substructures during testing. A scale model of the ESS system was designed and underwent an RTDSST test. The experimental data were found to be consistent with the numerical calculation results, which corroborates the reliability and validity of the proposed testing method. A comparison of the experimental results from different earthquake stages implies that seismic responses of the equipment and structure decreased in general due to the intervention of soil, but the soil effect weakened with earthquake intensity.
Highlights
With increasing number of nonstructural members being incorporated into modern building systems, damage to precision equipment and other nonstructural members may result in huge economic losses and serious safety hazards
In the real-time dynamic substructuring shaking table (RTDSST) tests with an account of the soil effect [12,13,14], the soil and upper structure are mostly treated as the numerical and experimental substructures, respectively, while the dynamic response of the overall coupled system investigation is based on the real-time data communication between the substructures
The equipment top acceleration was used as an indicator to assess the reliability of the proposed RTDSST testing method
Summary
With increasing number of nonstructural members being incorporated into modern building systems, damage to precision equipment and other nonstructural members may result in huge economic losses and serious safety hazards. In the conventional shaking table testing, construction of the entire ESS system would be too complicated and expensive This necessitates the development of a new test method that would improve the efficiency and accuracy of such testing and provide a more reliable basis for the seismic design of structures and equipment. In the RTDSST tests with an account of the soil effect [12,13,14], the soil and upper structure are mostly treated as the numerical and experimental substructures, respectively, while the dynamic response of the overall coupled system investigation is based on the real-time data communication between the substructures. The motion equation of equip-structure-soil dynamic interaction system can be deduced using the method of branch substructure After rearrangement, this equation was applied to real-time dynamic substructuring shaking table test. After the reliability of the testing method proposed in this study was verified, a comparative analysis of the seismic performance of the equipment and structure under the soil effect was performed
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