| As a typical structure form of the space grid structure,the single-layer reticulated shell is widely used.The researchers have found that the vertical seismic action has great impact on the structure’s seismic responses and its seismic performance.In order to reduce the adverse effects of the vertical seismic action to such kind of structure,this thesis introduces two kinds of dampers,named the tuned mass damper(TMD)and the viscous fluid damper(VFD),which have been frequently used and proved to be effective in the practical projects,to control the single-layer reticulated shell’s seismic responses under vertical seismic action.The main study contents are follows.(1)The TMD system is applied to the single-layer spherical dome and single-layer cylindrical lattice shell for the seismic reduction analysis under the vertical seismic action.Four synthesized ground motions composed from the Kanai-Tajimi model are chosen for the dynamic time history analyses.The reduction of the structure’s maximum node displacement,maximum Mises stress and maximum acceleration are used as the main factors to evaluate the influences of mass ratio,tuned period and TMD damping to the performance of the TMD system.Moreover,the location of TMD system is optimized.(2)The VFD system is applied to the single-layer spherical dome and single-layer cylindrical lattice shell for the seismic reduction analysis under the vertical seismic action.Based on the research group’s precious study about the optimal placement guidelines of VFD in the single-layer reticulated shell,the control result of VFD is analyzed.Moreover,the influence of the VFD’s damping coefficient is studied.(3)To analyze the application scope of the two kinds of dampers,their seismic reduction effects on different rise-span ratio single-layer reticulated shells,impacts on the structures’ bearing capacity and project costs are compared,and the engineering application recommendations are given. |
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