设置粘滞阻尼器的钢框架防连续性倒塌分析

Succesive collapse resistance analysis of steel framework mounted viscous dampers

为了研究设置有粘滞阻尼器的减震钢框架结构的防连续倒塌性能,对设置阻尼器的减震钢框架和未设置阻尼器的原钢框架分别进行了地震弹塑性时程分析,比较了两种情况下的层间位移角。分析结果表明,地震作用下,与原结构相比减震结构的层间位移角最大降低了64.3%。接着采用瞬时加载法对底层各柱失效时的减震钢框架和不设置阻尼器的原钢框架分别进行了动力倒塌分析,比较了减震结构和原结构防连续倒塌的能力,分析结果表明,底层柱失效时,减震结构各柱端点处位移均比原结构降低,最大处降低了63.5%。因此减震结构的阻尼器对结构防连续倒塌能起到较大的作用。

For study on successive collapse resistance of steel frames with viscous damper, in this paper, the story displacement angles were compared by the elastoplastic earthquake response analysis of the steel frameworks with and without dampers. The results show that： under the action of rare earthquake, comparing to the structure with out dampers, the interstory displacement angle of the frame mounted viscous dampers reduces by 64.3 %. After that the dynamic collapse analysis of two kinds of steel frame with and without dampers was conducted for the case of failure of columns in bottom storey. The results show that： when the bottom columns are failure, the maximum dis placement at the end of columns of the frame mounted viscous dampers reduces by 63.5%. The dampers of shock absorption structure also play a role in succesive collapse resistance.