| In this paper, the characteristics of the beam-column joint that damaged extremely easilyin the building structure under the effects of earthquake was viewed. In order to avoid its"weak node" failure mode, a new type of sector lead viscoelastic damper (SLVD) withindependent intellectual property right was proposed and which was used for improving theseismic performance of beam-column joint. In order to make the energy dissipationtechnology of the joints reinforcemented with the new sector lead viscoelastic damper appliedas soon as possible, the technical development and research work on the damper was carriedout, the key problems of engineering design and applicationwere solved.According to the design of new type sector lead viscoelastic damper, the configurationsmay influence its dissipation characteristics were made clearly. Different constitution of19sector lead viscoelastic dampers were designed and analyzed through finite element softwareABAQUS for research the configurations effects on the performance of energy dissipationand the damping characteristics, such as the amount&diameter of lead cores, thearrangement form of lead cores, the shear modulus of rubber, the thickness ratio of thin steel&rubber layer and strain amplitudes of loading were studied, the energy dissipationperformance, structure parameters influence and the stress distribution were investigated,also the mechanical model of it was analyzed through Skeleton curve. The analysis resultsshow that two kind of energy dissipation mechanism and two kind of energy dissipationmaterial were comprehensive utilized in SLVD, which not only have stable hysteresisperformance, good energy dissipation capacity and large deformation ability, but also thestress distribution of internal SLVD distributed uniform, without obvious stress mutationsphenomenon, and the SLVD constitution is reasonable. The double linear model can be usedto describe its mechanical model. The designed constitution parameters have the related effecton its energy dissipation performance. Two lead cores will be good for SLVD, the diameter oflead need to according the actual design, the rubber shear modulus should be set up in0.5~0.6MPa, and the thickness ratio of thin steel&rubber layer should be set between0.4and0.5.Based on the simulation analysis and optimization of SLVD constitution parameters,4SLVDs were designed and produced, each series was made two specimens which has differentshear modulus of rubber. Experimental investigations were carried out to study theperformance of4SLVDs by low cyclic loading. the test phenomenon was observed, the test results was analyzed, fatigue and large deformation wsa tested, all of tests were caried out forresearch the affect of the strain amplitude, frequency and so on, the test results and the finiteelement analysis results were also make a comparison with each other. The double linearmodel can be used to describe its mechanical model.Based on the simulation and experimental analysis on the dampers and materialproperties, geometric structure characteristics of the construction of it, the mechanical modelunder regular load recovery was established. The relationship between the structureparameters and mechanics model was made clearly. In order to make the SLVD can generalbe designed and analysised in large software, combination experience&theoretical formulaand the design method of SLVD was proposed. In order to apply the SLVD in engineering,several of performance and parameter tables were given.The sector lead viscoelastic dampers were applied in a frame core tube structure to forman energy dissipation structure, the ETABS software was used for analysis the originalstructure and SLVD structure, and the results show that: no matter the action of the frequentor the rare earthquake, the story drifts，roof acceleration and internal force of components ofSLVD structure were be effectively controled compared to original structure. The story driftsaverage about32%decreased, roof acceleration reduced about20%, internal force ofcomponents also were slowed the mutation, and the SLVD structure compared to VDstructure can be save43.85%of the cost. |
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