老化-荷载作用下叠层轮胎隔震垫时变力学性能

为研究建筑结构设计基准期(50年)内叠层轮胎隔震垫(scrap tire rubber pads，STRP)竖向力学性能的时变规律，对61组7层STRP支座施加5 MPa竖向荷载并分别进行老化31，62，93，124和154h的荷载耦合老化试验及普通老化试验.结合荷载耦合老化后轮胎的微观扫描电镜分析(SEM)及STRP的竖向力学性能试验，研究STRP在不同老化时间下的破坏特性、竖向承载力衰减，以及竖向刚度和竖向变形性能的退化规律.研究表明:在荷载耦合老化作用下STRP表面随老化时间的增加，裂缝扩展且局部轮胎内部炭黑外移析出，STRP竖向刚度逐渐增大，竖向变形性能变差，但极限承载力无明显改变.

Time-Varying Mechanical Properties of Laminated Scrap Tire Rubber Pads Subjected to Aging and Loading

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.