多自由度系统楼层最小地震剪力系数值的分析

On lowest seismic shear coefficient of multiple-degree-of-freedom system floor

采用多自由度系统为研究对象,在单向地震的作用下,推导出基底剪力的计算公式,并分析了结构自振周期、特征周期以及阻尼比对结构基底剪力的影响。分析结果表明:在满足质量系数的前提下,基底剪力并未达到预设的要求,所以控制最小剪重比是十分必要的。结构第一周期越大,结构剪重比越小;结构阻尼越大,结构剪重比越小;特征周期越大,结构剪重比越大。

Using the multi-degree-of-freedom system as the research object,under the action of one-way earthquake,the calculation formula of the base shear force was deduced,the influence of structural natural vibration period,characteristic period and damping on the shear force of the structural foundation is also analyzed. He analysis results show that under the premise of satisfying the quality coefficient,the base shear force does not reach the preset requirement,so it is very necessary to control the minimum shear weight ratio. The greater the first cycle of the structure,the smaller the shear weight ratio of the structure; the greater the structural damping,the smaller the shear weight ratio of the structure; the larger the characteristic cycle,the larger the shear weight ratio of the structure.