scholarly journals Study on the Seismic Performance of Different Combinations of Rubber Bearings for Continuous Beam Bridges

2020 ◽  
Vol 2020 ◽  
pp. 1-22
Author(s):  
Yumin Zhang ◽  
Jiawu Li ◽  
Lingbo Wang ◽  
Hao Wu
Keyword(s):  
Seismic Response ◽  
Seismic Performance ◽  
Time History ◽  
Single Type ◽  
Span Length ◽  
Continuous Beam ◽  
Continuous Beam Bridge ◽  
The Difference ◽  
Rubber Bearings ◽  
Beam Bridge

Rubber isolation bearings have been proven to be effective in reducing the seismic damage of bridges. Due to the different characteristics of isolation bearings, the mechanical properties of bridges with different combinations of rubber bearings are complex under the action of earthquakes. This paper focuses on the application of combinations of rubber isolation bearings on seismic performance of continuous beam bridges with T-beams. The seismic performances of continuous beam bridges with different combinations of rubber isolation bearings, pier height, and span length were studied by the dynamic time history analysis method. It was found that the bridges with natural rubber bearings (NRBs) have the largest seismic responses compared to the other types of bearings. The continuous beam bridge with isolation bearings, such as lead rubber bearings (LRBs) and high damping rubber bearings (HDRBs), has approximately 20%∼30% smaller seismic response than that with NRBs under the action of earthquakes due to the hysteretic energy of the bearings, indicating that the isolation bearings improve the seismic performance of the bridge. The continuous beam bridges with both NRBs and LRBs or NRBs and HDRBs have larger seismic response of the piers than those with a single type of isolation bearings (LRBs or HDRBs) but smaller seismic response of the piers than those with only NRBs. For a continuous beam bridge with shorter span and lower pier, it is not economical to use LRBs or HDRBs underneath every single girder, but it is more reasonable to use cheaper NRBs underneath some girders. The larger difference in stiffness of the bearings between the side and middle piers leads to the more unbalanced seismic response of each pier of the bridge structure. The results also show that with increasing pier height and span length, the difference in the seismic response value between the cases gradually increases.

Effects of Friction Force at Movable Supports on Seismic Performance of a Continuous Beam Bridge

2013 ◽  
Vol 353-356 ◽  
pp. 2191-2195
Author(s):  
Chang Feng Wang ◽  
Yi Jun Bao
Keyword(s):  
Friction Force ◽  
Seismic Performance ◽  
Seismic Design ◽  
Analytic Model ◽  
Continuous Beam ◽  
Friction Element ◽  
Continuous Beam Bridge ◽  
Earthquake Action ◽  
Beam Bridge

The friction force at movable supports has a certain influence on the seismic performance of the continuous beam bridge, so, the friction force should be taken into account in the seismic design of the bridges. The analytic model of the continuous bridge which including the effects of friction force at movable supports was put forward, and the analysis was done with the application of friction element. Through the analysis of a certain continuous beam bridge, the results indicate that the friction force can greatly decrease the earthquake action of this continuous beam bridge. And some suggestion on the bearing selection and the anti-seismic measure were also put forward according to the analysis.

A New Seismic-Isolation Device Applied in Continuous Beam Bridge

2011 ◽  
Vol 194-196 ◽  
pp. 2008-2013
Author(s):  
Bin Yan
Keyword(s):  
Seismic Performance ◽  
Seismic Isolation ◽  
Viscous Damper ◽  
Continuous Beam ◽  
Spring Stiffness ◽  
Continuous Beam Bridge ◽  
Linear Spring ◽  
Meizoseismal Area ◽  
Isolation Device ◽  
Beam Bridge

Continuous beam bridge was widely used, while seismic problem of it was prominent in meizoseismal area. According to seismic-isolation principle and mechanism of PSD, seismic performance of PSD were studied and the parameters of PSD were analyzed later, based on south approach of North Branch of Xia-Zhang Sea-Crossing Bridge. It was found that PSD, a combination of preloaded spring and liquid viscous damper, was an effective seismic-isolation device which could significantly reduce the seismic response of continuous beam bridge in longitudinal and transverse direction. Damper coefficient was the main parameter of PSD, while preloaded force, linear spring stiffness and damper index had a little effect on seismic performance of PSD.

Structural Type Selection of Middle and Small Span Bridges in Seismic Area

2013 ◽  
Vol 405-408 ◽  
pp. 1935-1938
Author(s):  
Xing Chao Zhang ◽  
Shi Peng Ji ◽  
Gui Lin Guo ◽  
Xiu Lan Wang
Keyword(s):  
Time History ◽  
Structural Type ◽  
Nonlinear Time History Analysis ◽  
Type Selection ◽  
Continuous Beam Bridge ◽  
History Analysis ◽  
Seismic Property ◽  
Rubber Bearings ◽  
Nonlinear Time History ◽  
Beam Bridge

In order to study the influence of bearing on the anti-seismic property of medium-small span bridge, based on a continuous beam bridge 5×30 m , the dynamic effects of four kinds of system was analyzed with static analysis and nonlinear time history analysis. The study shows that PTFE slide rubber bearings set at the abutment and laminated rubber bearings set at the piers was the best combinations for seismic.

scholarly journals Incremental dynamic analysis of the long-span continuous beam bridge considering the fluctuating frictional force of rubber bearing

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Man Liao ◽  
Bin Wu ◽  
Xianzhi Zeng ◽  
Kailai Deng
Keyword(s):  
Dynamic Analysis ◽  
Seismic Response ◽  
Vertical Component ◽  
Incremental Dynamic Analysis ◽  
Continuous Beam ◽  
Restoring Force ◽  
Long Span ◽  
Rubber Bearing ◽  
Continuous Beam Bridge ◽  
Beam Bridge

AbstractIn the seismic design of long-span bridges, the classic bi-linear model was used to simulate the frictional restoring force of the rubber bearings. However, in actual earthquake, the rubber bearing suffered fluctuating axial pressure in earthquake, even separated from the beam when vertical component of the earthquake was too strong. Employing the bi-linear model for the bearing may incorrectly estimate the seismic response of the bearings, as well as the whole bridge. This paper developed a nonlinear frictional bearing model, which can consider the variation of the frictional restoring force in the bearings, even the separation with the beam in vertical directions. A typical continuous beam bridge was modeled in ABAQUS, and incremental dynamic analysis was conducted for the quantitative comparison of the seismic responses using different bearing models. The intensity measure was selected as the ratio of the peak ground acceleration (PGA) in the vertical direction to the PGA in the horizontal direction. The analysis results indicated that the different bearing model led to the significant different seismic response for the bearings and piers, even the vertical component was small. The bi-linear bearing model would underestimate the seismic demand of the bearing and piers.

Numerical Simulation of Ship-bridge Collision Based on LS-DYNA Technique

2011 ◽  
Vol 243-249 ◽  
pp. 6230-6236 ◽  
Author(s):  
Li Tian ◽  
Cong Zhu
Keyword(s):  
Time History ◽  
Continuous Beam ◽  
Deformation Response ◽  
Continuous Beam Bridge ◽  
History Of ◽  
Collision Force ◽  
Coupling Algorithm ◽  
Beam Bridge ◽  
Oil Tanker ◽  
Good Agreement

A collision between a 2600 DWT oil tanker and the substructure of one railway continuous beam bridge is simulated using ANSYS/LS-DYNA. In the simulation, the dynamic interaction between the soil and piles is consideredthrough contact coupling algorithm and nodes sharing algorithm. The time history of ship collision force, penetration and velocity of the ship for the two different algorithms are presented, and relations of them are given. In addition, energy dissipation in every parts, deformation response and stress distribution of the substructure are analyzed in detail. The results indicate that rules of ship-bridge collision given by the two algorithms are in good agreement. Finally, reliability of the simulation in this paper is demonstrated through the comparison with specifications.

Study on the damping efficiency of continuous beam bridge with constant cross-section applied by lead rubber bearings and fluid viscous dampers

2020 ◽  
Vol 51 (4-5) ◽  
pp. 85-92
Author(s):  
Li Zhen ◽  
Li Dejian ◽  
Peng Leihua ◽  
Lu Yao ◽  
Cheng Kepei ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Seismic Isolation ◽  
Seismic Energy ◽  
Continuous Beam ◽  
External Energy ◽  
Fluid Viscous Dampers ◽  
Continuous Beam Bridge ◽  
Lead Rubber Bearings ◽  
Rubber Bearings ◽  
Beam Bridge

Bridges are the lifelines of disasters in earthquake areas. Therefore, it is very necessary to ensure the safety and traffic function after earthquake. Seismic isolation refers to install external energy dissipation devices or external energy input devices in specific parts of engineering structures. There are certain differences in longitudinal and transverse seismic responses of multi-span continuous beam bridges by changing the seismic dynamic characteristics or dynamic effects of structures. It is difficult to achieve the purpose of seismic isolation in both horizontal directions using isolation devices alone. The rubber deformation ability of lead rubber bearings can effectively insulate, and the yield energy consumption ability of its lead core can effectively consume the seismic energy for damping. The horizontal resistance is very small under the creep load, and the stiffness decreases rapidly after yielding under the strong dynamic earthquake load; meanwhile, the seismic energy is dissipated by the hysteresis of bearing. Fluid viscous damper is a velocity-dependent energy dissipation device, which produces viscous damping force, provides strong restoring force for components, and has a good limit function. This process will also dissipate the seismic energy, so as to reduce the structural earthquake response. Using these two methods together, the horizontal seismic responses of multi-span continuous beam bridges can be effectively controlled at the same time. Based on this idea, this article takes a high-speed multi-span continuous beam bridge with equal section as the engineering background, and uses dynamic time history analysis method to discuss the seismic isolation effect of lead rubber bearings and fluid viscous dampers.

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