Study On Aging Performance And Isolation Performance Of Laminated Shock Isolation Pad Based On Thermal Oxygen Aging

In view of the present situation of village and town buildings in high intensity areas of China and their significant failure under seismic action,scholars at home and abroad have done a lot of research on the economy,rationality and isolation performance of different simple isolation systems in villages and towns,but on the whole,the limit function and reset ability of isolation system are limited,which causes the dislocation of isolation structure after earthquake.Under the factors of convenient construction,low cost and green environmental protection in villages and towns,a new type of simple isolation technology under laminated tire wall is proposed,which is suitable for high intensity village area.The technology is used in combination with the Scrap Tire Pads and under-wall isolation structure,and can play a good limit and reset effect while realizing the purpose of isolation,which is expected to be popularized in high intensity village area.However,tire rubber,as a kind of polymer material,is prone to aging under the action of load,temperature,air and other factors,which leads to the change of mechanical properties of the isolation bearing,and then weakens its isolation effect,which endangers the safety of the isolation structure.In order to ensure the safety of the Scrap Tire Pads during the whole life cycle of the building and the stability of the related mechanical properties,this paper focuses on the sustainable application of the laminated tire wall isolation structure,surrounding the thermal oxygen aging and aging-The aging performance and isolation performance of laminated tire isolation pads under load erosion environment were studied as follows:(1)Through the study of compressive stress relaxation of laminated tire isolation pad under different compressive stress,the motion law of rubber molecular chain is understood,its loading stress and the loss law of compression permanent deformation are investigated,and the compressive stress correlation and aging relaxation mechanism of laminated tire isolation pad are analyzed.(2)The aging performance of STP was studied by laboratory accelerated aging test method.The corrosion morphology and deterioration rate of STP in thermal oxygen erosion environment were analyzed,and the microstructure and morphological variation characteristics of STP thermal oxygen Aging were analyzed by SEM scanning electron microscope technique.The two reaction mechanisms of fracture and crosslinking of rubber molecular chain were further investigated by means of rubber aging.(3)Through the study of the mechanical properties of STP under the action of Thermal oxygen Aging and aging-load coupling,the time-varying laws of the mechanical properties such as the bearing capacity,vertical stiffness,compressive elastic modulus,vertical deformation performance,horizontal stiffness and yield stiffness of STP were obtained,and the mechanism of mechanical properties degradation of STP under different erosion environments was revealed.At the same time,the axial pressure failure criterion of STP is put forward,and the formula of vertical deformation performance applicable to STP is modified.(4)Through the thermal oxygen aging and quasi-static test research and theoretical analysis of STP,the effects of aging time and design compressive stress on the hysteresis curve,equivalent resistance nibby,skeleton curve and residual displacement of this new type of isolation pad are quantitatively studied.The influence law of STP isolation performance with aging is revealed,and its performance degradation mechanism is analyzed.The results show that the STP under thermal oxygen aging erosion has stable energy dissipation and reset ability.(5)Through the study of the quasi-static test of STP under aging-load coupling,combined with the internal and external breakage behavior of STP under the action of aging-load coupling,the influence law of aging-load erosion environment on STP isolation performance and the degradation mechanism of isolation performance are analyzed synthetically.At the same time,the life prediction of laminated tire isolation pad is carried out.The results show that the mechanical properties of STP are stable during the whole life cycle of building structure,and they have reliable isolation performance.