带有转动摩擦阻尼器钢框架的抗震性能分析

Seismic performance analysis of steel frame with rotational friction damper

为研究转动摩擦阻尼器不同布置形式对钢框架抗震效果影响,采用SAP2000建立11个有限元计算模型,针对转动摩擦阻尼器5种布置形式进行8度罕遇地震作用下弹塑性时程分析。研究了结构层间位移、顶点位移、顶点加速度和柱底剪力,并对时程曲线及减震率进行对比分析,确定转动摩擦阻尼器在钢框架结构中的最优布置方案。弹塑性时程分析结果表明,在底部3/4楼层高布置转动摩擦阻尼器时,钢框架结构的减震效果最佳,且塑性铰发展缓慢,结构始终处于弹塑性状态。

In order to study the effect of different arrangements of rotational friction dampers on the seismic performance of steel frames,11 finite element models were established by SAP2000,and elastic-plastic time-history analysis was carried out for 5 arrangement forms of rotational friction dampers under 8-degree rare earthquakes.The inter-story displacement,peak displacement,peak acceleration and column bottom shear of the structure were studied,and the time-history curve and shock absorption rate were compared and analyzed to determine the optimal arrangement scheme of rotational friction dampers in steel frame structure.The results of elastoplastic time history analysis show that the steel frame structure has the best damping effect when the rotational friction dampers are placed at 3/4 floor height of the bottom,and the plastic hinge develops slowly and the structure is always in the elastic-plastic state.