Abstract
There are a large number of damping materials in high-damping rubber (HDR) bearings, so the HDR bearings have the characteristics of both common rubber bearings and damping measures and show good aseismic effect. In this paper, the time-history dynamic analysis method is used to study the seismic effects of HDR bearings on the aseismic behaviors of two-span simply supported beam bridge under Northridge earthquake by changing the damping characteristics of the bearings. It is found that, with increasing damping of the bearings, both the horizontal shear and the displacement of the HDR bearings decrease, and the seismic energy dissipates through both the yield deformation and damping of the bearings. Although the girder and bearings have smaller displacement, when the HDR bearings with larger damping, the seismic responses, including displacement of pier top, shear force of pier bottom, and bending moment of pier bottom, are hardly affected by the change of the damping of the bearings. The HDR bearings with higher damping and yield characteristics separate and dissipate the seismic energy transmitted to the superstructure of the bridge and have better seismic effect on the structure in an earthquake.
Highlights
It widely recognized that the mechanical properties of high-damping rubber materials are relatively complex and the stress-strain relationship of high-damping rubber materials is approximately linear in the case of small strain, but nonlinear in the case of large strain [6, 7]. e coupling of damping property and nonlinear material property makes the seismic performance of the HDR bearing under the action of the earthquake more complicated
Cardone et al [13] compared the seismic performance of viscous dampers, high-damping rubber bearings, and their combinations, and the studies indicate that HDR bearings and damper with damping ratios ranging from 10% to 25% make the displacement of the bridge
Many research studied the seismic response of continuous beam bridge supported on HDR bearings with experimental and analytical method. e study shows that the isolation effect of the HDR bearing is obvious under the action of small earthquakes, but the bridge structure will be nonlinear under the action of large earthquakes, and the isolation characteristic of the bearing is undefined [8, 12,13,14,15]
Summary
High-damping rubber is made by adding graphite, etc. to ordinary rubber in order to improve its viscoelasticity and overall damping properties [1], dissipate seismic energy to a certain extent, and thereby reduce the seismic response of the structure and extend the structural period. us, HDR is widely used in bridge structures [2,3,4,5]. To find out the effects of the damping and yield characteristics of HDR bearings on the aseismic behaviors of bridge structures, many researchers have studied the effects for different bridge structures. Erefore, the research on the effects of the material characteristics of HDR bearings on their aseismic behaviors is beneficial to understanding the seismic theory of HDR bearings and thereby ensures that the bridge structure will not be seriously damaged under the action of a strong earthquake. Erefore, the finite element method was used to study the effects of HDR bearings with different dampings on the aseismic behaviors of two-span supported beam bridge by coupling their damping and yield characteristics. The aseismic performance of HDR bearings with different dampings for the bridge was studied, in order to study the effects of the damping characteristics of the bearings on the seismic response of the structure.
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