铅芯橡胶支座滞回曲线的扁环现象及其恢复力模型

大量的试验数据表明,铅芯橡胶支座的滞回曲线与加载时程密切相关.目前现有的铅芯橡胶支座恢复力模型中都没有考虑加载时程基础上的应变滞回特性,针对铅芯橡胶支座的这一特性,提出了铅芯橡胶支座的“扁环”效应,根据双拐点原则建立了考虑加载时程应变滞回特性的剪切弹塑性的“扁环”效应恢复力模型,并对提出的恢复力模型进行了静力试验验证.试验结果表明:作者提出的“扁环”效应能很好地描述铅芯橡胶支座加载时程的应变滞回特性,“扁环”效应恢复力模型合理、精确,适合于精确的非线性时程分析.

Flat - loop Effect and Hysteresis Property of the Rubber Bearings

The experiments show that the hysteresis property of lead plug rubber bearings(LRB) is closely related to load time,which is not considered in the existing mechanics model of LRB.Based on the strain hysteresis property during the load or unload process of LRB,the flat-loop effect is provided in the paper.The shear hysteretic model which includes the flat-loop effect is established according to the double knee point principle,it is also proposed in the paper in the load or unload process.We complete the static test with the original rubber bearings to testify the new hysteretic model provided in the paper.The results show that the new hysteretic model could describe the flat-loop effect of LRB, and the analysis results considered the flat-loop effect are more ideal,the new model is suitable for a higher precise numerical analysis for isolated structures.