主体结构隔震的二次结构减振分析

Seismic analysis on secondary structures of base-isolated primary structures

二次结构常常在大震甚至中小地震中发生损坏或中断工作,急需寻找安全有效的设计方法。对一幢典型结构,考虑不同场地条件、主体结构隔震以及二次结构不同阻尼比的影响,计算各层的楼面绝对加速度与相对位移反应谱。分析表明,主体结构隔震或同时增大二次结构阻尼是取得二次结构较好减振效果的有效途径,主体结构的隔震阻尼不宜太大,主体结构隔震后二次结构对所在楼层位置的敏感性大大降低。

Strong earthquakes often lead to damage or to losing functions of secondary structures. The secure seismic methods of the secondary structure are necessarily studied. The floor response spectrums of absolute acceleration and relative displacement on a typical building are calculated. The influences of the primary structure base isolation, the damping of the secondary structures and site condition upon the seismic response of the secondary structures are considered. It is shown that the primary structure base isolation and increasing the damping of the secondary structures are effective seismic reduction methods, increasing the base-isolated layer damping of the primary structures is slightly unfavorable to the secondary structures,and the sensitivity of the secondary structures to the primary structure stories is enormously reduced.