Abstract: To investigate the time-varying vertical mechanical properties of laminated scrap tire rubber pads (STRPs) within the design reference period of building structure (50 years)， the tests of aging coupled with loading were carried out on the 61 groups of 7-layer STRP bearings that were subjected to aging for 31， 62， 93， 124， and 154h and loading of 5MPa， separately， and the traditional aging tests without loading were also carried out under the same conditions. And then， the results of two groups were compared. The STRP failure feature， vertical bearing capacity， and vertical stiffness/deflection in different aging time were studied through vertical mechanical experiment and scanning electron microscopic. It is concluded that， as the aging time increases， the cracks of STRP surface propagate， the carbon black particles inside the tire move toward the surface of STRP， the vertical stiffness of STRP increases but vertical deformation performance of STRP declines， while the ultimate bearing capacity of STRP changes little.

Key words: seismic isolation; laminated scrap tire rubber pad; aging-loading coupling; mechanical properties; time-varying regularity