Large cascaded shear model box internally provided with electromagnetic damping devices, and use method thereof

Abstract

The invention discloses a large cascaded shear model box internally provided with electromagnetic damping devices. The model box is formed by cascading rectangular frames formed by welding square steel tubes at an equal interval, wherein sheet magnets are bonded and fixed on the inner top surfaces of the square steel tubes along a vibration direction; a steel cross beam embedded with a plurality of iron cores contactlessly penetrates through each steel tube, and the polarities of magnetic poles of an upper working surface of each iron core and a lower surface of the corresponding sheet magnet are enabled to be the same; the two ends of each cross beam are connected with screws suspended on a cross beam of a counter-force frame respectively; and cross beams with iron cores are arranged on a plurality of frame layers to form a multilayer damping system. According to the model box disclosed by the invention, electromagnets generate an upward electromagnetic repulsion force with the sheet magnets, and generate an attraction force for the lower bottom surfaces of the steel tubes in the case of power-on, a part of the dead weight of the frame layer where the electromagnets are located is transferred to be born by the cross beam, and transferred to the counter-force frame outside a vibration table surface, thus an interlayer damping effect of the model box is realized. The model box disclosed by the invention is simple in structure and capable of being repeatedly used.

Description

technical field [0001] The invention relates to a model box for a shaking table test of an underground structure, in particular to a large-scale laminated shear model box with a built-in electromagnetic drag reduction device and a use method thereof. Background technique [0002] The model box is one of the important equipment for the shaking table test of underground structures. The wave reflection generated at the boundary and the change of the vibration form of the box itself will affect the rationality of the test results to a certain extent, that is, the so-called "model box effect". ". Therefore, a reasonable model box design should make the boundary conditions of the model box soil consistent with the prototype as much as possible, and make the model foundation soil shear deformation under the action of earthquakes. At present, there are mainly three kinds of shaking table test model boxes commonly used at home and abroad: rigid model box, flexible model box and lami...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a large-scale laminated shear model box with a built-in electromagnetic drag reduction device for shaking table tests, so as to overcome the effects of self-weight, frame interlayer resistance and box inertia effects on the simulation effect in the existing large-scale laminated shear model box adverse effects, and at the same time make the self-weight of the box meet the load-bearing capacity requirements of the vibration table equipment

Images