Decoupled Calculation and Case Study Analysis of Friction Pendulum Bearing Considering the Jumping-Off Effect

Abstract

Under the coupled horizontal and vertical seismic actions, the Friction Pendulum Bearing (FPB) exhibits a phenomenon where the slider jumps off and detaches from the lower plate. When the jumping phenomenon occurs in the FPB, there are complex issues of motion coupling, friction coupling, and friction nonlinearity between the bearing plate and the slider. Current research overlooks the impact of the jumping-off effect on the response of the FPB, and the widely used Bouc–Wen model in existing studies is incapable of analyzing this effect. To address these problems, this paper abandons the traditional energy equivalence method and innovatively proposes a theory for analyzing the jumping-off effect by combining the multi-contact point vector projection method with the friction decoupling analysis method. This theory is applied to decouple the response analysis of the FPB under the jumping-off effect and elucidate the amplification effect caused by the jumping-off through numerical examples, paving the way for subsequent precise analysis and laying a theoretical foundation.