In order to investigate shear deformation and friction sliding characteristics of plate rubber bearings, horizontal cyclic loading tests were conducted for 7 groups of plate rubber bearings without top and bottom steel plates considering effects of vertical compressive stress, loading rate and rubber material to analyze deformations and stress states of plate rubber bearings in different loading stages, and discuss variation laws of aseismic performance parameters, such as, horizontal equivalent stiffness and energy dissipation under different influence factors. Test results showed that working state of plate rubber bearings under action of cyclic loads can be divided into 4 stages, their horizontal bearing forces and stiffness in different stages vary obviously; in the 3rd stage, bearing contact surface is seriously worn due to significant sliding to cause horizontal bearing force and stiffness dropping, horizontal bearing force drops by 30%, so it is necessary to consider their mechanical performance degradation caused by bearing warpage, friction and wear in analysis and evaluation of aseismic performance of bridges; under different influencing factors, bearing mechanical performance after sliding can have different changes, however, finally its force-displacement relation gradually becomes stable to reveal stable hysteretic characteristics, so plate rubber bearings can be designed as a “fuse type unit”.
Key words
plate rubber bearing /
friction sliding /
aseismic performance /
shear deformation /
test study
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References
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