Mechanical Properties of Thick Rubber Bearing and Its Earthquake-and Subway-Induced Vibration Control Analysis
In order to achieve the control of earthquake-and subway-induced vibration in over-track buildings,thick rubber bearings(TRBs)are used in their structural transfer floor.Compared to conventional rubber bearings,the thickness of each rubber layer of TRBs is increased to isolate the horizontal earthquakes and mitigate the vertical vibration caused by subway.To evaluate the effects of TRBs in over-track buildings,an isolator with a first shape factor of 6.82 was designed in this study.Physical testing,including compression,shear,tension,and stability tests under large vertical loads,was conducted on a full-scale isolator.The effects of vertical compression stress,shear strain,and loading frequency on the mechanical properties of this TRB were explored.Performance properties,such as compressive stiffness,horizontal equivalent stiffness,equivalent damping ratio,and tensile stress were identified for the isolation design.Then,based on the identified parameters,numerical models of over-track buildings supported by fixed base,conventional rubber bearings and TRBs were established,respectively.Finally,time-history analyses were carried out by inputting selected seismic waves and three-direction subway vibration measured from field tests.TRBs were verified to provide effective subway and earthquake vibration control,and thus they represent a technical support for over-track buildings.
thick rubber bearingfirst shape factormechanical propertiesover-track buildingearthquake-and subway-induced vibration control
万方数据
维普
