基础隔震结构的减震耗能特性分析

根据基础隔震理论,在钢筋沥青隔震礅的基础上,提出一种新型钢结构隔震礅,设计和制作了缩尺房屋模型,并对其进行振动台试验。通过对隔震结构模型的动力特性、地震响应及能量平衡分析,绘制试验过程中的加速度及能量时程曲线,研究钢隔震礅应用于低层框架结构的减震耗能能力。大量工程实例可以看出该隔震礅隔震效果显著,制作简单、价格低廉、耐久性好,适于在广大村镇地区低层框架结构中推广使用。试验表明:隔震结构模型在不同的地震作用下,加速度折减系数处在0.24~0.51之间,且结构的阻尼耗能在振动台试验中占总输入能量的60%~70%,对结构耗能起主导作用,说明该基础隔震装置不仅具有较好的减震耗能特性能,对于控制隔震层的位移也有好的效果。

Analysis of energy dissipation characteristics of base isolation structure

Based on the theory of base isolation.this paper presents a new type of pier isolation of steel structure based on the theory of base isolation.By analyzing the dynamic characteristics,seismic response and energy balance of the isolated structure model,the acceleration and energy time-history curves during the test are drawn,and the energy dissipation capacity of steel isolation pier applied to the low-layer frame structure is studied.The results show that the acceleration reduction coefficient of the isolated structure model is between 0.24 and 0.51 under different earthquake actions,and the damping energy dissipation of the structure accounts for 60%~70%of the total input energy in the shaking table test,which plays a leading role in the structural energy dissipation,indicating that the base isolation has a better energy dissipation characteristics and control the displacement well.The steel isolation pier with effective seismic isolation,simple structure,low cost and good durability is applicable for low-rise frame structures in rural areas.