钢筋沥青隔震结构隔震效果的影响因素研究

Study on influencing factors on isolation effect of steel-asphalt isolated structure

介绍了钢筋沥青隔震层设计时应满足的条件,并利用时程分析法中的Newmark-β法分析了地震动峰值、隔震层阻尼以及隔震层刚度等因素对钢筋沥青隔震结构隔震效果的影响。在实验室进行了钢框架模型振动台试验,研究上部钢框架等效抗侧刚度与隔震层抗侧刚度之比对隔震效果的影响。结果表明,各种工况下的钢框架等效抗侧刚度与隔震层抗侧刚度之比对隔震效果影响显著;当抗侧刚度比达到一定值时钢筋沥青隔震结构可以达到较好的隔震效果。这也证明钢筋沥青隔震技术是非常实用的隔震技术,所研究的结果可为编制有关规程提供参考。

The conditions to meet in steel-asphalt isolation layer design were introduced, and the Newmark-~ method of time-history analysis method was used to analyze the influences of seismic vibration peak, isolation layer damping and isolation layer stiffness factors on isolation effect of steel-asphalt isolated structure. The shaking table test on steel frame model was carried out in the laboratory to study the effect of the ratio of equivalent lateral stiffness of the upper steel frame to the lateral stiffness of the isolation layer on the seismic isolation effect. Results show that under various working conditions, the ratio of equivalent lateral stiffness of the upper steel frame to the lateral stiffness of the isolation layer has significant effect on the seismic isolation; when the lateral stiffness ratio reaches a certain value, steel-asphalt isolation structure can achieve well seismic isolation effect. It also proves that steel-asphah isolation technology is very practical. The results of the study can provide a reference for the preparation of the relevant specifications.