The Parameter Study of the Seismically Isolated Bridge System by Lead Rubber Bearing Based on Energy Analysis

2011 ◽  
Author(s):  
Tieyi Zhong ◽  
Changyong Zhang ◽  
Fengli Yang
Keyword(s):  
Time History ◽  
Seismic Energy ◽  
Parameter Study ◽  
Energy Response ◽  
Analysis Model ◽  
Seismically Isolated ◽  
Rubber Bearings ◽  
Seismically Isolated Bridge ◽  
Isolated Bridge ◽  
Bridge System

The energy response equations of the seismically isolated bridge system are established based On the energy equilibrium theory. Bilinear analysis model of the energy response of the seismically isolated bridge is constructed by series connecting the bridge piers and the Lead rubber bearings. According to the applicable Code of Seismic Design for Railway Engineering, forty strong ground motion records are appropriately selected as the seismic input and the nonlinear time history analyses for the seismic energy responses of the bilinear SDOF seismically isolated bridge systems with different natural periods are carried out. The influences of peak ground accelerations, principal dynamic parameters of isolated bridge system on input energy and their distributions are studied.

Isolation Effect Analysis for Hong Kong-Zhuhai-Macau Bridge

2011 ◽  
Vol 90-93 ◽  
pp. 946-950 ◽  
Author(s):  
Tao Wang ◽  
Yu Li ◽  
Jing Ning ◽  
Yan Wei Li
Keyword(s):  
Seismic Energy ◽  
Effect Analysis ◽  
Nonlinear Seismic Response ◽  
Seismic Motion ◽  
Rubber Bearing ◽  
Lead Rubber Bearing ◽  
Seismically Isolated ◽  
Seismically Isolated Bridge ◽  
Isolated Bridge ◽  
Analysis Models

According to the behavior of seismically isolated continuous bridges, the bidirectional nonlinear characteristics of lead rubber bearing are taken into account by using two orthogonal nonlinear level spring elements. Based on the FEA software, the analysis models of seismically isolated and non-isolated continuous bridges are established. And the nonlinear seismic response for these analysis models is carried out under the function of the reasonably chosen seismic motion. The analytic results indicate that the natual period of seismically isolated bridge can be prolonged to avoid the principal period of ground and the seismic energy of structure can be efficiently consumed by the hysteretic energy dissipation of lead rubber bearing. So the response of bridge structure can be reduced to make sure most of the component work in the elastic phase and the structure can be well protected.

scholarly journals Effect of Material Characteristics of High Damping Rubber Bearings on Aseismic Behaviors of a Two-Span Simply Supported Beam Bridge

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Yumin Zhang ◽  
Jiawu Li
Keyword(s):  
Time History ◽  
Bending Moment ◽  
Seismic Energy ◽  
Northridge Earthquake ◽  
Horizontal Shear ◽  
Simply Supported Beam ◽  
Simply Supported ◽  
High Damping Rubber ◽  
Rubber Bearings ◽  
Beam Bridge

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.

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