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结合现行国家规范与规程,采用弹塑性时程分析方法,对某防屈曲支撑框架结构进行抗震分析,探讨该类结构在罕遇地震作用下的动力响应。重点讨论了在罕遇地震作用下结构的基底剪力、剪重比、层间位移角、构件塑性发展过程以及防屈曲支撑滞回耗能特性。计算结果显示,结构X向顶点最大位移为655mm,最大层间位移角为1/111;Y向顶点最大位移为745mm,最大层间位移角为1/103,均满足抗震规范的相关要求。动力弹塑性分析结果显示,无论从杆件塑性铰出现情况,还是从杆件的地震响应,以及不同位置防屈曲支撑的滞回曲线都可以看出,防屈曲支撑有效地吸收了一部分地震动传给结构的能量,减小了其地震响应。
In combination with the existing national codes and regulations, the seismic analysis of a buckling-supported frame structure is carried out by elasto-plastic time-history analysis and the dynamic response of such structures under rare earthquakes is discussed. The base shear force, shear weight ratio, interlayer displacement angle, component plasticity development and hysteretic energy dissipation characteristics of structures under rare earthquakes are discussed. The calculation results show that the maximum displacement of structure X to the apex is 655mm, the maximum layer displacement is 1/111, the maximum displacement of Y to the apex is 745mm and the maximum layer displacement is 1/103, all of which meet the requirements of seismic code. The results of dynamic elasto-plastic analysis show that the buckling brace effectively absorbs some of the earthquake motion, no matter from the appearance of the plastic hinge of the rod or from the seismic response of the rod and the hysteretic curve of the buckling support in different positions Give the energy of the structure, reducing its seismic response.