A test system for simulating artificial boundary of foundation suitable for seismic multi-point input

Abstract

The invention provides a testing system suitable for earthquake multipoint input and capable of simulating a foundation artificial boundary. The testing system comprises a force application device, abase structure, a force guide device, electrorheological fluid, a rigidity control device, a damping control device, positive and negative plates, anti-seepage tarpaulin and a connecting component forconnecting the force application device and the rigidity control device and is characterized in that the base structure comprises a base, a table board and support columns; the force guide device isarranged on the table board, ,and the force application device is arranged on the base of the base structure; the force guide device comprises a force guider, a contact cylinder, a horizontal force guide plate and a vertical force guide plate; the rigidity control device is of a cylindrical structure and comprises a rigidity controller, a leaf ring spring and a disk spring; the anti-seepage tarpaulin is fixedly connected to the lower portion of the force guide device and the interior of the rigidity controller in a closed manner; the force application device comprises three different-directionforce applicators; the upper portion of the connecting component is fixedly connected with a regulator. The testing system can simultaneously regulate the multidirectional rigidity of the springs andcan be applied to a multipoint earthquake test to simulate the artificial boundary.

Description

Technical field [0001] The invention relates to a structural earthquake simulation device, in particular to a simulation suitable for multi-point ground motion tests based on viscoelastic artificial boundary theory. Background technique [0002] In recent decades, with the development of engineering technology, more and more large-span structural buildings have been constructed. Such building structures often undertake important economic, cultural and social functions, etc. Therefore, when an earthquake occurs, it is of great significance to ensure the safety and stability of such structures. In the 2008 Wenchuan earthquake, tens of thousands of people were placed in the Mianyang Kyushu Gymnasium, which made engineers realize the importance of the seismic design of large-span structures. [0003] For seismic response analysis of long-span structures, traveling wave effects, coherence effects, and local site effects in the process of earthquake propagation need to be considered. Th...

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Problems solved by technology

[0003] For the seismic response analysis of long-span structures, it is necessary to take into account the traveling wave effect, coherence effect and local site effect in the process of earthquake propagation, so the time and space changes of ground motion must be considered, so long-span structures are multi-dimensional and multi-point ground motions Excitation, while the existing structural earthquake simulation device is mainly based on the shaking table, which is a comprehensive high-tech product, expensive, and most of them are multi-dimensional consistent excitation for earthquake motion, which cannot meet the current earthquake requirements of large-span structures. Dynamic test simulation needs for time and space differences

[0004] Specifically, the viscoelastic artificial boundary theory converts the input of ground motion into an equivalent load acting on the artificial boundary to realize the input of fluctuations, effectively absorbs the seismic wave radiated from the finite area of ​​the foundation to the infinite area, and can well simulate the artificial The elastic recovery performance of the semi-infinite foundation outside the boundary. Based on this, the existing earthquake simulation device cannot simulate the artificial boundary, and cannot simulate the multi-point earthquake test at the same time.

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