Research On Seismic Behaviors Of Suspend-Dome Structures Using Multidimensional Isolation Systems

Suspend-dome structure is a combination of single-layer spherical lattice shell and its prestressed cable-strut system,which has been widely used in landmark large-scale public buildings.These building usually have relatively high seismic requirements.However,there are a large number of nodes and members in the suspend-dome structures,and dynamic properties of these structures are complex.For the suspend-domes,the conventional seismic resistance techniques relying on strength and ductility properties cannot be used to prevent structural damage and failure from strong earthquakes.In view of this,friction pendulum bearings(FPBs)and shape memory alloy cable-friction pendulum bearing(SMA-FPB)are used as horizontal isolators,and pre-pressed spring devices(PSDs)and viscous dampers are combined to form vertical isolators(damped vertical isolation bearing,DVIB).Feasibility analyses of these multidimensional isolation bearings in suspend-dome structures were examined through numerical simulation.The main contents of this thesis are as follows:(1)The configurations and isolation mechanisms of FPB,SMA-FPB,and DVIB were described in detail,and the corresponding numerical models were constructed.Based on the experimental results that were obtained from previous investigations,the numerical models of these isolators were validated.(2)A suspend-dome with a span of 80 m was used as the benchmark structure for seismic response analysis.FPBs were placed at the top of the substructure to support the suspenddome roof.The numerical model of the FPB-isolated structure was constructure,and the seismic vibration control of this isolated structure was explored.(3)The benchmark structure was employed as research object.SMA-FPBs were arranged at the supports between the roof and its substructure to develop a high-isolation system.Open Sees program was used to evaluate the seismic protection effects of this controlled structure.(4)In the established benchmark structure,DVIBs and SMA-FPBs were used for vertical isolation of the roof and horizontal isolation of the entire structure consisting of the roof and its substructure.The structural modeling and seismic response simulation were implemented into Open Sees,and the effectiveness of the aforementioned separated isolation system for controlling three-dimensional dynamic response of the benchmark structure was investigated.