Based On Self-centering Rigid Sliding Isolation Bearing Comparative Analysis Of Isolation Technology

With the rapid development of science and technology,the shortcomings and shortcomings of laminated rubber isolation bearing have gradually emerged.The pollution problem caused by the use of lead core of laminated rubber bearing,the high cost problem caused by the reinforcement of the upper structure of the rubber aging replacement,and the two-way coupling of the vertical bearing surface pressure and horizontal shear displacement of laminated rubber bearing,the high cost problem caused by the continuous expansion of the bearing size in the case of excessive displacement has been urgently solved.In order to solve these problems,a new self-resetting rigid sliding isolation bearing with two-way decoupling of vertical bearing surface pressure and horizontal shear displacement is proposed in this paper.Based on the new bearing,the correlation between different pressure,loading displacement and horizontal loading frequency and hysteretic characteristics was studied.Based on the existing research,the seismic performance of the new self-resetting rigid sliding bearing and the rubber bearing was compared and analyzed.ETABS calculation software uses the same model as the superstructure,inputting artificial and natural seismic waves of different strengths,and recording and analyzing the corresponding response of the superstructure,so as to analyze the performance of different supports under the same structure and the same earthquake.Further exploration is carried out to study the law of the displacement and amplification coefficient of rubber bearing and self-resetting rigid slip bearing under different fortification intensity,different surface pressure,different bearing types and different site cycles.The calculation formula is derived and verified with examples.The amplification coefficient is calculated when the displacement of each bearing type just exceeds the limit,so as to obtain 30 performance tables.The performance tables of two different supports are compared and analyzed.The results show that:（1）With the increase of vertical compressive stress and horizontal loading frequency,the hysteretic curve of the support will become fuller and the energy consumption will increase.The different initial position of the rigid slider will lead to the overall energy dissipation error of the support,the maximum error is 11%,and the average error is 4%.And after the removal of the reset rubber bearing test,the sliding friction element can still work stably,with good stability.（2）Under earthquake protection,both kinds of supports can better improve the response peak of shear force and interstory displacement Angle generated by earthquake,and the seismic shear force and interstory displacement Angle of the structure are effectively controlled.In rare earthquakes,two kinds of supports are used for seismic isolation to ensure that the displacement Angle between layers of the structure meets the limit requirement of 1/50,and the displacement,tensile and compressive stresses of the support are controlled within a reasonable range to ensure the stable performance of the isolation layer.When the upper structure was set at the same level,the economic efficiency of the rubber bearing and the self-resetting rigid slip bearing were studied.In the two simulations,the cost of the self-resetting rigid slip bearing was reduced by 17.3%and 49%,respectively,compared with the rubber bearing.（3）The calculation formula of the demand displacement U_max of the isolation layer is derived,and the calculation formula is verified according to the example.For the foundation isolation structure,the simplified calculation method is adopted to calculate the maximum demand displacement of the isolation layer,showing the extremely high calculation accuracy.According to the magnification coefficient in the performance table,the two kinds of supports are compared,and the difference of magnification coefficient is about 30%when the displacement of two kinds of supports is just beyond the limit.