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基于串联刚片模型,推导了隔震结构的振动方程,通过对一个典型的偏心隔震结构进行数值分析,讨论了上部结构的质量偏心、上部结构偏心率、隔震层偏心率和隔震层的水平刚度对扭转效应的影响。结果发现,隔震层刚度对隔震结构扭转效应起主要作用,隔震层刚度越大,扭转效应越明显;质量偏心率和隔震层偏心率的增大都会增大隔震结构的扭转效应,但增幅不超过30%;随上部结构偏心率的增加,层内力比逐渐增大,减震效果变差。因此,实际应用中应该控制偏心率不大于0.6,否则,应以层扭矩比而不是层剪力比作为减震效果的依据;对于隔震结构,建议用位移比作为扭转不规则的判断条件,即当位移比超过1.2时,认为隔震结构为扭转不规则。
Just mesh model based on the series, vibration equations derived isolation structure, by a typical isolated eccentric structures numerical analysis discussed eccentric mass of the upper structure, the upper structure eccentricity, eccentricity and isolation layer isolation layer The Effect of Horizontal Stiffness on Torsion Effect. It was found that the stiffness of the isolation layer torsion effect isolation structure plays a major role, the greater rigidity isolation layer, the more obvious the effect of twisting; mass eccentricity and the eccentricity increased isolation layer will increase the torsional effect of isolated structure , But the increase does not exceed 30%. With the increase of the eccentricity of the superstructure, the internal force ratio gradually increases, and the damping effect becomes worse. Thus, the practical application should be controlled eccentricity is not larger than 0.6, otherwise, should not layer than the torque based on a ratio of the shear layer damping effect; for isolated structure, as recommended by the torsional displacement ratio determination irregular conditions, That is, when the displacement ratio exceeds 1.2, it is considered that the isolation structure is irregular in torsion.