【摘要】 采用阻尼杆件替代双层网壳结构中的部分下弦杆件,既不改变原结构的网格形式,又对其进行有效的减振控制。在ANSYS软件中建立粘弹性阻尼杆件的数值模型,采用阻尼杆件对网壳部分下弦杆件进行替换,建立网壳减振结构数值模型;分别采用8种阻尼杆件替换方式对结构进行控制,进行结构的三维地震作用分析,在三种常用II类场地地震作用下考察替换杆件布局对结构控制效果的影响。研究表明:阻尼杆件布局方式对结构动力响应的控制效果有较大影响,合理布置阻尼替换杆件可以有效降低结构最大节点位移、最大节点加速度、最大杆件轴力等响应,控制效果可以达到20%～30%。更多还原

【Abstract】 Replacing partial lower chords in double-layer spherical latticed shells with bar-type dampers can achieve good effect on vibration control without changing original structural layout of grid.The numerical analytical model of replaceable bar-type viscoelastic dampers is established firstly in ANSYS software.Then,the finite element analytical model of controlled double-layer spherical latticed shells is developed,in which some designated lower chords are replaced with the dampers.Eight layout schemes of the replaceable dampers are considered in the control shells.The influence of dampers’ layout on the vibration control effect of the lattice shells under strong ground motions(II site category) is investigated through 3-D time history analysis.The investigated result indicates that the layout of the dampers has a significant influence on the dynamic responses of the lattice shells.With reasonable layout of replaceable bar-type dampers,structural dynamic responses,e.g.the maximum nodal displacement,the maximum nodal acceleration,the maximum axial force of components,etc.can be reduced by 20 to 30 percent.更多还原