Research On Tensile Friction Pendulum Isolation Bearing And Its Application In K8 Spherical Reticulated Shell

In recent years,the single layer spherical lattice shell receives a rapid development in public buildings for its advantages of excellent pe rformances,lightweight,graceful shapes,and economic rationality.Meanwhile,this kind of structure usually possesses high importance and safety grades.Therefore,its seismic performance is worthy of in-depth study.The traditional friction pendulum bearing(FPB)has great vertical bearing capacity,good torsional behavior,and re-centring capability.But when it is applied to a long-span spatial structure,it will cause key problems such as insufficient tensile capacity.Aiming at the above problems,a tensile friction pendulum bearing(TFPB)suitable for long-span spatial structures is proposed,and its vibration-damping performance is theoretically and numerically analyzed from the component level.In addition,the static and seismic performance of the single layer spherical lattice shell using TFPB are comprehensively analyzed.The main work of this thesis is as follows:1.Theoretical analysis and finite element modeling on TFPB.Firstly,the shock absorption mechanism of the TFPB’s horizontal isolat ion system was studied from the theoretical level.Then,the energy equation of the friction pendulum isolation structure was given,and the calculation formula of the equivalent friction coefficient of TFPB was derived.At last,the finite element solid model of TFPB was established and verified.2.Numerical analysis on mechanical properties of TFPBBased on the finite element model of TFPB,the influence of horizontal displacement,vertical pressure,curvature radius,and friction coefficient on the bearing energy dissipation behavior was analyzed,and the correctness of the equivalent friction coefficient formula was verified.The tensile bearing capacity,the hysteretic characteristics of the axial tension,and the stability under the eccentric tension limit state of TFPB were studied.And the influence of the vertical tensile and shock absorption system on its horizontal sliding and re-centring performance was evaluated.3.Analysis on static and dynamic characteristics of the reticulated shell using TFPBBased on finite element software ANSYS,a finite element model of K8 reticulated shell structure using TFPB was first established,and its static performance was studied.Then the corresponding reinforcement measures were proposed and the effectiveness of reinforcement was verified.Finally,the modal analysis of reticulated shell structures using TFPB with different vector-to-span ratios and spans was carried out to obtain dynamic characteristics of it.4.Research on seismic performance of reticulat ed shell structure using TFPBFirstly,an optimal layout scheme was proposed after analyzing the seismic isolation effect of the reticulated shell structure under different TFPB layout schemes.Secondly,based on the optimal layout scheme,the damping effect of TFPB was analyzed,and the feasibility of applying TFPB to different vector-span ratios and span lattice shells was verified.Then based on the good damping effect of TFPB,the influence of its tensile stiffness on the damping effect was analyzed,and then the basic principles for selecting the tensile stiffness of TFPB were summarized.Finally,some recommendations for seismic design of the K8 single-layer spherical reticulated shell structure with TFPB were proposed.