阻尼对加层房屋地震反应的影响和修正

The Influence and Revising of the Damping for the Building Adding Storeys

加层房屋中的加层部分常为轻型结构，其阻尼比一般为０．０２左右。而我国抗震规范中的地震反应谱曲线仅适用于阻尼比为０．０５的结构，因而加层房屋在进行抗震计算时需考虑阻尼的影响。本文运用能量法推导出加层房屋不同振型的阻尼比的计算公式及其地震反应谱的修正方法。

Nowadays the added storeys of the building are always light structure.Its damping ratio ξ is about 0.02.But the seismic response spectrum in the Chinese Specification is only suitble for the structure whose damping rarion is 0.05 .So we should consider the influence of the damping when calculating the horizontal seismic shear of the added part.Using the energy method,this paper not only gives the calculation formula of the damping ratio for different vibration mode and present the vevising method of the seismic response spectrum of the building adding storeys,but also gives an example.