Flat ring phenomenon of hysteresis curve of lead-core rubber support and its model of restoring force

rubber supports;  the flat ring effect;  resilience model;  Load time

A large number of test data show that the hysteresis curve of the lead-core rubber support is closely related to the loading time history. At present, the existing recovery force model of lead-core rubber support does not consider the strain hysteresis characteristics based on the loading time course, in view of this characteristic of the lead-core rubber bearing, the "flat ring" effect of the lead-core rubber support is proposed, and the "flat ring" effect of the shear elastic plastic "flat ring" effect considering the loading time course strain hysteresis characteristic is established according to the principle of double inflection point, and the proposed restoring force model is verified by static test. The experimental results show that the "flat ring" effect proposed by the author can well describe the strain hysteresis characteristics of the loading time history of the lead-core rubber support, and the "flat ring" effect recovery force model is reasonable and accurate, which is suitable for accurate nonlinear time history analysis.