Friction type seismic mitigation and absorption support vibration table reduced scale test numerical calculation method

Abstract

The invention relates to a friction type seismic mitigation and absorption support vibration table reduced-scale test numerical calculation method. The method comprises the steps of (1) building an ideal friction type seismic mitigation and absorption support numerical model; 2) introducing gravity distortion and friction space variability for correction; 3) realizing numerical simulation of the vibration table test of the friction type seismic mitigation and absorption support with different scale ratios; 4) acquiring required actual seismic wave data; 5) calculating the response of the friction type seismic mitigation and absorption support under the action of each seismic wave by using a stepwise integration method; 6) realizing storage and drawing of model numerical calculation data; 7) analyzing the error influence of factors such as a friction space distribution form, a shear key, viscous damping, spring rigidity and spring initial force on the response of the reduced-scale model; and 8) explaining an error source based on an analysis result and proposing an effective solution. The invention provides the numerical calculation method for the reduced-scale test of the vibrationtable of the friction type seismic mitigation and absorption support, which can effectively solve the problem of inconsistency of the test and numerical simulation in the reduced-scale test of the vibration table.

Description

technical field [0001] The invention belongs to the technical field of numerical analysis and computer simulation, and relates to a numerical calculation method for a vibration table scaled-down test of a friction-type shock-absorbing and isolating support. Background technique [0002] Seismic activities near urban areas will have a severe impact on human society, seriously threaten human life, damage infrastructure, and seriously affect human social and economic life. In order to reduce the impact of earthquakes on transportation, many shock-absorbing and isolating devices are widely used in bridge structures. In recent years, research on shock-absorbing and isolating devices has mainly focused on the use of friction. Compared with traditional shock-isolating devices, this type of shock-absorbing and isolating devices can obtain better shock-isolation effects. Among them, friction pendulum system (FPS) has been widely used in engineering practice due to its good seismic f...

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Problems solved by technology

However, due to the limited space size and bearing capacity of the shaking table, the shaking table simulation is usually only applicable to the scale test, and in the scale test, various factors such as mechanical production and gravity acceleration will affect the scale-down process of the tested system, making the scale-down The accuracy of the results obtained from the test cannot be guaranteed, resulting in the "inconsistency" problem between the actual shaking table scale test results of the above-mentioned friction-type shock-isolating bearings and the numerical simulation results of the scale-scale test of the structure under ideal conditions

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