软钢阻尼器加固某大跨度结构减震性能研究

Study on Earthquake Resistant Performance of a Large Span Structure Strengthened with HADAS

"5.12汶川"大地震后,受影响的部分地区设防烈度进行了调整,设防烈度调整后大部分建筑尤其是公共建筑需要进行抗震加固。以地震时正在修建的某大跨度体育教学训练中心为背景,针对该地区设防烈度提高的特殊性,对其设防烈度提高前、后的抗震性能进行了评估,采用有限元模型对不同软钢阻尼器抗震加固方案进行了动力分析,评价了不同软钢阻尼器加固方案的减震效果。结果表明:(1)软钢阻尼器的设置对于调整结构的水平刚度,增强结构的耗能能力,改善结构的减震性能具有重要作用;(2)软钢阻尼器宜布置在层间位移角较大的楼层,即结构刚度变化较大的相邻楼层;(3)软钢阻尼器的数量及布置方式有优化解等结论,为该工程结构的抗震加固设计提供了依据,同时可供同类建筑结构的抗震加固设计借鉴。

After the ＂5.12 Wenchuan＂ earthquake, the fortification intensity of part of the affected areas has adjusted, most of the structures especially the public buildings need to reinforcement after the fortification in- tensity was adjusted. In this paper, based on a sports teaching training center which is building when the earthquake happening, with the particularity of the fortification intensity increased, evaluated the seismic per- formance of the structure before and after fortification intensity increased, and dynamic analysis on the finite element model of different HADAS reinforcement schemes has been done, then evaluated the shock absorption effect under different reinforcement schemes. The results show that ： 1 ） HADAS has important role to adjust the vertical stiffness, enhance the capability of energy consumption, and improve the damping performance of structure; 2） HADAS should decorate in the layer which has larger inter-story displacement drift, that is the neighboring story of stiffness changes greatly ; 3） the number and arrangement mode of the HADAS has optimal solution and so on, provide the basis for the engineering reinforcement design of the structure, at the same time give reference for this kind of building structure＇ s seismic strengthening design.