黏滞消能器在八度区某框剪结构中的应用

Application of Viscous Damper in a Frame Shear Structure in Octave Region

在位于高烈度地区的某框剪结构新建医院中设置黏滞阻尼器进行减震设计,并对该结构进行罕遇地震作用下的弹塑性变形验算,以保证发生本区域设防地震时不会丧失使用功能。采用建筑结构有限元分析软件ETABS分别对抗震结构和消能减震结构,将根据规范选取的三条地震波沿主轴方向双向输入,进行8度大震作用下的动力非线性时程分析。通过对比最不利工况下两种结构的计算结果,表明黏滞阻尼器能显著减小该建筑的基底剪力、层间位移角和主要受力构件的开裂破坏。阻尼器耗能在总非线性耗能中占比30%,且在罕遇地震下提供给结构的附加有效阻尼比达到2.6%。消能装置有效保护主体结构的安全,提高其抗震性能,保证该医疗建筑震后能正常使用。

Viscous dampers were set up in a new frame-shear wall hospital located in high intensity area to carry out shock absorption design,and the elastic-plastic deformation of the structure under the action of rare earthquake was checked to ensure that the function of this area would not be lost in the event of earthquake.Using the finite element analysis software ETABS for building structures,the three seismic waves selected according to the code are input along the principal axis in two directions,and the dynamic nonlinear time history analysis under the action of 8 de⁃gree earthquake is carried out.By comparing the calculation results of the two structures under the most unfavorable conditions,it is shown that the viscous damper can significantly reduce the base shear,inter-story displacement an⁃gle and the cracking failure of the main stressed members of the building.The energy dissipation of the damper ac⁃counts for 30%of the total nonlinear energy dissipation,and the additional effective damping ratio provided to the structure under rare earthquakes is up to 2.6%.The energy dissipation device can effectively protect the safety of the main structure,improve its seismic performance,and ensure the normal use of the medical building after earthquake.