Abstract
In order to avoid unexpected damage of structural specimens in the test, at the beginning, a signal with small amplitude is adopted to input the shake table device to gain the transfer function and corresponding drive signal, and then a strong earthquake output can be reproduced by amplifying the drive signal proportionally. However, as there are obvious nonlinearities inherent in the shake table device and structural specimen under strong earthquakes, errors inevitably exist in the replayed and amplified earthquake output if the linear transfer function and the drive signal, which are obtained by the small amplitude input, are adopted, and the desired output signal cannot accurately be achieved. Considering this point, several typical structural experiments are introduced and analyzed in this paper to study the earthquake output accuracy of the large‐scale shake table test, such as inertia and elastic specimens, large‐span floor, isolated building, high‐speed railway station, bridge piers, and collision of adjacent multispan bridges. The transfer function of the shake table device and structural specimen is described. The energy‐time history (energy‐TH) index can assess the accuracy of the shake table on the strong earthquake output in the aspect of specimens other than signals themselves. The double parameter performance table is established based on this energy‐TH index. More attention should be paid to energy and amplitude for the reproduction of strong earthquakes, and the accuracy details of signal reproduction should not be too strict.
Highlights
Earthquake is a devastating and widespread natural disaster, which causes a serious threat to civil engineering and the safety of people’s life and property [1]
Based on the shake table tests of several typical civil engineering structures, this paper systematically evaluates the strong earthquake output accuracy of the shake table, puts forward the energy-TH index, and establishes the performance table of double index parameters. e following conclusions are given: (1) e nonlinearity of the shake table and specimens has influence on the large earthquake output
E accuracy of the strong earthquake output is generally related to the shake table performance, weight and stiffness of specimens, shake table-specimen interaction, and earthquake outputs. (2) e transfer function obtained under small excitation input and the drive signal obtained by iterative control system (ICS) are feasible for strong earthquake output
Summary
Earthquake is a devastating and widespread natural disaster, which causes a serious threat to civil engineering and the safety of people’s life and property [1]. For the above method of determining the transfer function and drive signal for small-scale excitation and realizing strong earthquake by linear amplification output, the accuracy is not guaranteed after the specimen enters the stage of ICS (offline) Desired 6-DOF seismic wave (6). E accuracy of strong earthquake output of the shake table can be assessed by three indices: root-mean-square (RMS) error r [15], time-domain error e [16], and correlation coefficient c. Is index includes the influence of output errors on the cumulative damage of the specimen It is one of the main indices to judge the control accuracy of the shake table. In the research of this paper, the specimen is the concern of test, so the selected index should consider the influence on structural response and damage except the reproduction accuracy of the signal. By calculating parameters b and c of different types of tests, the performance of the shake table can be assessed to directly provide a reference for the future shake table test
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