Design,checking and calculation of seismic reduction and isolation for rail transit bridges
Bridges are an important part of rail transportation lines.Natural disasters such as earthquakes can cause serious damage to rail transit bridges,thereby affecting the safety and reliability of rail transit transportation,so it is of great significance to carry out research on seismic reduction and isolation design of rail transit bridges.For this reason,this article selects the(75+128+75)m double-lane continuous girder bridge of the express line from Xiong'an New Area of Hebei province to Beijing Daxing international airport across the Tianjin main line of the South-North Water Transfer Project as the research object to carry out the seismic reduction and isolation design,checking and calculation.First,the seismic reduction and isolation design is summarized,i.e.,the structure,the intrinsic model,the deployment position,and the parameter values of the adopted hyperbolic spherical seismic reduction and isolation bearing;then,a finite element calculation model is established for the checking and calculation of the above seismic reduction and isolation design,and the effects of the adoption of the hyperbolic spherical seismic reduction and isolation bearing and the spherical ordinary bearing on the structural forces and displacements are analyzed to determine the reasonableness of the design;finally,the results of the calculations show that the application of hyperbolic spherical seismic reduction and isolation bearing can significantly reduce the seismic response of the structure,with obvious seismic reduction effect,and can achieve the seismic performance objectives.
rail transitbridgesseismic reduction and isolation designhyperbolic spherical seismic reduction and isolation bearingchecking and calculation
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