Design and Experimental Study on Steel Damping Isolation Bearing of Simply Supported Beam for High-Speed Railway
Based on the principles of shock absorption and isolation,a steel damping seismic isolation bearing suitable for high-speed railway simply supported beams in high-intensity areas is developed by adding damping elements of soft steel yield type to the spherical steel bearings.The bearing has the characteristics of simple structure,clear physical model,excellent seismic reduction and isolation performance,excellent durability,adaptability to large displacement requirements for seismic reduction,and convenience for post earthquake replacement.The test results show that the measured values of vertical deformation,friction coefficient,and shear pin breaking force of the support are smaller than the design values,which meets the railway industry standards and design requirements;the hysteresis curve shape of the support is very full,with strong plastic deformation ability,and still has good energy dissipation ability under multiple cyclic loads;the seismic reduction rate of the bearing increases with the increase of seismic intensity,which can fully meet the seismic reduction and isolation performance requirements of bridges under high-level earthquake conditions.Combined with engineering examples for calculation and analysis,the results show that the seismic reduction and isolation effect of the bearing is significant,consistent with the conclusions of the shaking table test.
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