Laminar shear model box capable of simulating viscoelastic boundary

Abstract

The invention discloses a laminar shear model box capable of simulating a viscoelastic boundary, and belongs to the field of vibration testing of civil engineering structures. A box body of the laminar shear model box is formed by overlapping N layers of square steel tube frames at equal intervals; each layer of the square steel frame is formed by mutually welding four square steel pipes; in every two adjacent layers of the square steel frames, three stainless steel base plates are welded between the lower surface of the upper square steel frame and the upper surface of the lower square steel frame at equal intervals; three independent V-shaped grooves perpendicular to one another in direction are milled in each stainless steel base plate; the V-shaped angle of each groove bottom is 90 degrees; a plurality of steel balls are placed in each groove so as to form freely-sliding supporting points; and the two sides in the longitudinal direction of the box body are each provided with two round steel stand columns and steel cross beams. According to the laminar shear model box capable of simulating the viscoelastic boundary, the rigidity and the damping coefficient of the box body can be adjusted according to the soil properties of different soil bodies, and seismic responses under different soil layers or layered soil site conditions can be simulated well.

Description

technical field [0001] The invention relates to a laminated shear model box capable of simulating the viscoelastic boundary in a shaking table test. The model box can adjust the stiffness and damping coefficient of the box body according to the soil properties of different soils, so as to achieve maximum reduction of the soil mass in earthquakes. The purpose of dynamic response under action belongs to the field of vibration testing of civil engineering structures. Background technique [0002] In the shaking table test of underground structures, structures (such as tunnels and subway stations, etc.) and rock and soil bodies are generally placed in a model box in order to achieve the effect of simulating the seismic response of underground structures in actual strata. However, due to the very limited volume of the model box, when the seismic wave propagates to the inner wall of the box, the box itself will form strong reflection and scattering waves for the seismic wave, whic...

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Problems solved by technology

However, due to the very limited volume of the model box, when the seismic wave propagates to the inner wall of the box, the box itself will form strong reflection and scattering waves for the seismic wave, which is inconsistent with the actual situation that the seismic wave propagates to infinity, so The model soil in the conventional model box cannot simulate the free field conditions of the prototype site well during the shock, which affects the reliability of the test results

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