Experimental Study On Seismic Performance Of Lead Viscoelastic Energy-dissipating Coupling Beams

Taking a ten-story shear wall structure in a high-intensity area as an example,the lead viscoelastic coupling beam damper(LVCBD)was used to control the shear wall structural vibration through the design of seismic energy dissipation.The ETABS software was used to carry out the elastic time history analysis of the shear wall structure and the energy dissipation structure equipped with LVCBDs under the action of frequent earthquakes,and the SAUSAGE software was used to carry out the elastic-plastic time history analysis of the energy dissipation structure equipped with LVCBDs under the action of rare earthquakes.The analysis results show that the application of lead viscoelastic energy-dissipating coupling beam in shear wall structure can effectively reduce the seismic response of the main structure,control and improve the damage of the main structural element.The seismic performance of the whole structure has been improved obviously.Based on the design and analysis of the energy dissipation structure in Chapter 2,a traditional reinforced concrete coupling beam(CB)full-scale specimen and a lead viscoelastic energy-dissipating coupling beam(LVECB)full-scale specimen were designed.Through the pseudo-static test,the seismic performance of the two specimens was compared and analyzed.The reliability of the connection scheme between the LVCBD and the non-energy dissipation beams was verified.At the same time,The influence of the floor slab and the functional self-recovery of the lead viscoelastic coupling beam were studied.The research results show that the LVCBD plays a good role in energy dissipation and reduces the damage of non-energy dissipation beams and wall limbs.The seismic performance of the LVECB specimen is obviously better than that of the CB specimen,and it has certain functional self-recovery after earthquake.The deformation of the LVECB mainly concentrates on the LVCBD and the concentrated deformation of LVECB has a certain influence on the damage mode of floor slab.The connection scheme between the energy dissipating beams and the non-energy dissipating beams has the advantages of simple design,clear force transmission and strong reliability.ABAQUS finite element simulation software was used to analyze the LVCBD and the LVECB,which order to study the influence of increasing gap between the floor slab and the LVECB on the LVECB.The analysis results show that the finite element simulation method used in this paper is relatively reasonable,and can simulate the real test situation of the CB and the LVECB well.Increasing gap between the floor slab and the LVECB can improve the damage mode of the floor slab and reduce the damage to the floor slab caused by the concentrated deformation of the LVECB,but the it will reduce the maximum bearing capacity and secant stiffness of the LVECB,and also have a certain influence on the energy dissipation capacity under small displacement.