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When the ground motion is input into a Spring-Viscous damping-Coulomb friction plane isolation system with XY shear keys along a certain inclined angle, XY shear keys will be sheared asynchronously, which will lead to the structural violent curvilinear movement in the plane, resulting in the plane friction coupling effect. In this paper, the influence of the plane friction coupling on the relative displacement response of the structure is studied, and the variation of the structural peak relative displacement with the spring stiffness coefficient, damping constant and friction coefficient is analyzed in detail, so as to find the optimal parameter design of the plane isolation system under the plane friction coupling effect. The results indicate that the plane friction coupling can amplify the peak relative displacement, and the smaller the peak ground acceleration is, the more significant the amplification effect is. Although the mechanism of friction and viscous damping is different, the peak relative displacement will decrease with the increase of friction coefficient or damping constant, and it will decrease rapidly at first and then slowly, so the optimal parameters can be obtained at the cutoff point of the reduction rate. However, with the increase of spring stiffness coefficient, the amplification effect of relative displacement caused by plane friction coupling will be significantly reduced, and the amplification effect will decrease rapidly at first, and then decrease slowly, so there is also a dividing value for spring stiffness coefficient, and this value will not cause resonance phenomenon.

Parameter optimization analysis of plane friction coupling effect