村镇滑移隔震建筑输入能量的参数敏感性分析

PARAMETER SENSITIVITY ANALYSIS OF THE EARTHQUAKE INPUT ENERGY FOR RURAL BUILDING STRUCTURES SUPPORTED ON SLIDING BASE-ISOLATION SYSTEMS

以村镇滑移隔震建筑为研究对象,以总输入能量为响应指标,采用正交试验的方法,研究了总输入能量对刚度比、第二阶段刚度系数、隔震层屈服位移、摩擦系数、质量比和上部结构固有周期的敏感性。研究表明:在该文所研究的参数范围内,总输入能量对参数的敏感性几乎均与地震动幅值和场地条件有关,各种条件下上部结构固有周期对总输入能量的影响都是最为显著的,当上部结构固有周期大约为0.1 s时,总输入能量受场地条件的影响比较小,当地震动幅值较大时,摩擦系数与总输入能量基本呈正比关系,刚度比、隔震层屈服位移、第二阶段刚度系数和质量比均对总输入能量有一定的影响,但影响程度相对较小。

Taking the stiffness ratio, the post-yield stiffness coefficient, the yield displacement of the isolation layer, the friction coefficient, the mass ratio and the natural period of the superstructure as the influencing factors, sensitivity analysis of the total earthquake input energy is carried out for rural building structures supported on sliding base-isolation systems. In the sensitivity analysis, the orthogonal experiment method is adopted, and the total earthquake input energy is treated as the only response index. The present study shows that the sensitivity of the total earthquake input energy always depends on the amplitudes of earthquake motions and the engineering site conditions in the whole parameter range of concern, and the natural period of the superstructure exhibits a demonstrable effect on the total input energy. The engineering site condition shows the lowest effect on the total earthquake input energy when the natural period of the superstructure is about 0.1s. The total input energy has a nearly linear relationship with the friction coefficient in the case of large amplitudes of earthquake motions. It is also discovered that the stiffness ratio, the yield displacement of the isolation layer, the post-yield stiffness coefficient and the mass ratio have relatively weak effect on the total input energy when the rural building structures supported on sliding base-isolation systems are subjected to severe ground motions.