The Moony-Rivlin model is widely applied in finite element analysis of rubber isolators,in which a key point is to determine material parameters of the model.In order to study the effect of aging on material constant of rubber intensively,the material constants of Moony-Rivlin model were obtained through investigating aging test result of rubber by the Least-square method.The relationship between the material constants and the aging time was derived and a modified model was achieved.The fitting values were compared with the calculating ones.Finally,the performance of the rubber isolators was simulated and studied by using the Abaqus software and the material constants were determined from the above method.The results of finite element analysis were compared with the test results.The results show that:Moony-Rivlin model constant increases gradually with aging time;the errors between the test values and the finite element simulation values for the vertical stiffness and the horizontal stiffness are acceptable,whether before aging or aged,which proves the accuracy of the modified constitutive model.This work provides theoretical support for the performance study of rubber isolated bearings under the aging environment and the life-cycle performance design about bridges and other structures.%目前 Moony-Rivlin 模型被广泛应用于橡胶隔震支座的有限元分析中，其中，材料常数的标定是关键环节。为充分了解老化作用对橡胶材料常数的影响，采用最小二乘拟合法计算老化试验后的 Moony-Rivlin 模型材料常数，拟合出材料常数随老化时间的变化关系式，提出了修正 Moony-Rivlin 模型，并将拟合值和计算值进行对比。最后，根据上述方法确定的材料常数用 Abaqus 软件对隔震橡胶支座老化前后的性能进行了模拟分析，并将有限元分析结果与试验结果进行对比。结果表明：随着老化时间的增加，Moony-Rivlin 模型常数逐渐增大；老化前、后橡胶隔震支座的竖向刚度、水平刚度试验测试与有限元模拟值的误差均在可接受的范围内，验证了所建立修正本构模型的准确性，可为橡胶隔震支座老化性能的研究和桥梁等结构全寿命性能设计提供理论支撑。
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