层间粘结废旧轮胎隔震垫竖向力学性能及竖向刚度计算方法研究

THE VERTICAL MECHANICAL PROPERTIES AND VERTICAL STIFFNESS CALCULATION METHOD OF LAYER-BONDED SCRAP TIRE RUBBER PADS

  • 摘要: 为将隔震技术推广应用至低层村镇建筑,制作造价低廉的层间粘结废旧轮胎隔震垫(LBSTP)。本文选用9个橡胶哑铃型试样进行轮胎橡胶材料的单轴拉伸试验,并对21个不同第一形状系数S1及层数的LBSTP进行竖向压缩刚度试验和竖向压缩极限试验。结果表明:通过一阶Ogden模型拟合得到废旧轮胎橡胶材料的本构参数和剪切模量G;竖向压缩刚度随着S1的增加而增加;竖向压缩刚度随着废旧轮胎叠层层数的增加而减小;钢丝网和帘布层的断裂后,LBSTP仍具有一定承载能力;叠层形式对LBSTP竖向力学性能影响不大;相较于规范公式,提出的竖向刚度修正公式能更好地预测LBSTP的竖向刚度,可为LBSTP隔震设计中的竖向刚度选取提供参考,有利于LBSTP在村镇建筑隔震技术中推广使用。

     

    Abstract: This study focuses on applying seismic isolation to low-rise rural buildings. Low-cost Layered Bonded Scrap Tire Pads (LBSTP) were made. Nine rubber dumbbell specimens were tested for uniaxial tension. Vertical compression stiffness and ultimate vertical compression tests were performed on 21 LBSTPs with different first shape factors (S1) and layer counts. Results show that the constitutive parameters and shear modulus G of scrap tire rubber material can be obtained by using the first-order Ogden model. Vertical compression stiffness increases with S1, and decreases as the number of layers increases. Even after the steel mesh and canvas layers break, the LBSTP still has some load-bearing capacity. The laminated structure has little effect on the vertical mechanical properties of LBSTP. Compared with code formula, the proposed vertical stiffness correction formula predicts the vertical stiffness of LBSTP more accurately. It can guide the selection of vertical stiffness in LBSTP seismic isolation design. This will help promote the application of LBSTP in seismic isolation technologies to rural buildings.

     

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