乌鲁木齐某中学隔震结构设计与分析

Seismic Isolation Design and Analysis of the School Building in Urumqi

结构中设置柔性隔震层可以延长整个结构体系的自振周期,增大阻尼,减少输入上部结构的水平地震作用,提高建筑物的抗震性能。以乌鲁木齐市某中学食堂为例,在ETABS模型与PKPM模型一致的情况下,用ETABS软件对结构进行隔震设计与地震反应分析。结果表明:通过合理选取和布置隔震支座,此结构自振周期延长近4倍,层间剪力约为非隔震结构的1/3。设计上部结构时,设防烈度可从8度0.2 g降至7度0.15 g,并且隔震层的最大位移也在规定范围内,隔震效果明显。

Setting the flexible isolation layer in structure can prolong the natural vibration period and increase the damping of the whole structure,and it can decrease horizontal earthquake action that input the superstructure to improve the anti-seismic property of buildings. Taking a high school cafeteria in Urumqi as an example,under the condition of ETABS model and PKPM model is consistent,ETABS is used to design and analysis the structure. It indicates that the natural vibration period of the structure extended nearly four times and interlaminar shear force of the isolation structure is about a third as many as the non-isolated structure by reasonable selection and arrangement of the isolation bearing. Fortification intensity can be dropped from 8degree（ 0. 2 g） to 7 degree（ 0. 15 g） when design the superstructure,and maximum displacement of isolation layer is also within the prescribed scope,vibration isolation effect is obvious.