scholarly journals Seismic performance of a continuous bridge with winding rope device activated by a fluid viscous damper

2022 ◽  
pp. 136943322110700
Author(s):  
Wenxue Zhang ◽  
Lijun Su ◽  
Cheng Zhang ◽  
Yongrui Zheng ◽  
Weifeng Yang
Keyword(s):  
Shaking Table Test ◽  
Frictional Resistance ◽  
Shaking Table ◽  
Seismic Load ◽  
Viscous Damper ◽  
Damping Force ◽  
Fluid Viscous Damper ◽  
Bridge Model ◽  
Continuous Girder Bridge ◽  
Girder Bridge

The seismic requirements of piers with fixed bearings (the fixed pier) for continuous girder bridges are relatively high, while the potential seismic capabilities of piers with sliding bearings (the sliding piers) are not fully utilized. To solve this contradiction, a new type of winding rope shock absorption device activated by a fluid viscous damper (WRD-D) was proposed. The WRD-D was installed on the top of the sliding piers, and the both ends of a fluid viscous damper were connected to the superstructure by winding ropes. During an earthquake, the damping force rises with the increase of relative speed between the sliding piers and the superstructure, activating the WRD-D and producing large frictional resistance, subsequently causing the sliding piers and the fixed pier to bear the seismic load cooperatively. In this study, the working mechanism of the WRD-D was researched. The shaking table test of a scaled continuous girder bridge model employing the WRD-D was conducted. The test results reveal that the WRD-D can effectively reduce the seismic requirements of the fixed pier and the superstructure displacements.

Shaking Table Test of a Long-Span Continuous Girder Bridge

2012 ◽  
Vol 446-449 ◽  
pp. 242-246
Author(s):  
Yan Jiang Chen ◽  
Da Xing Zhou ◽  
Wei Ming Yan ◽  
Zhen Yun Tang
Keyword(s):  
Shaking Table Test ◽  
Shaking Table ◽  
Long Span ◽  
Continuous Girder Bridge ◽  
Girder Bridge

Shaking Table Test of a Long-Span Continuous Girder Bridge

2012 ◽  
Vol 446-449 ◽  
pp. 242-246
Author(s):  
Yan Jiang Chen ◽  
Da Xing Zhou ◽  
Wei Ming Yan ◽  
Zhen Yun Tang
Keyword(s):  
Seismic Design ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Technology Study ◽  
Long Span Bridges ◽  
Long Span ◽  
Test Technology ◽  
Continuous Girder Bridge ◽  
Girder Bridge ◽  
Support Excitation

Compared with middle-span bridges, seismic response of long-span bridges is more complicated, and so is seismic design. For example, influence of high order modes is obvious, as well as multi-support excitation, all kinds of nonlinear factors and soil and structure interaction (SSI). It is necessary to study on seismic behavior of a long-span continuous girder bridge. With the help of shake table array and substructure test technology, study on seismic performance of a long-span continuous girder bridge has been done and some useful conclusions have been got.

scholarly journals Research on Longitudinal Collapse Mode and Control of the Continuous Bridge under Strong Seismic Excitations

2020 ◽  
Vol 10 (17) ◽  
pp. 6049
Author(s):  
Yale Li ◽  
Zhouhong Zong ◽  
Bingwen Yang ◽  
Yuanzheng Lin ◽  
Jin Lin
Keyword(s):  
Control Methods ◽  
Viscous Damper ◽  
Fluid Viscous Damper ◽  
Rubber Bearing ◽  
High Damping Rubber Bearing ◽  
Collapse Mode ◽  
Bridge Collapse ◽  
Continuous Girder Bridge ◽  
High Damping Rubber ◽  
Girder Bridge

Bridge collapse events are common in major earthquakes around the world, among which continuous girder bridges are the most involved. In order to explore the collapse mechanism of a continuous girder bridge in an earthquake, the collapse mode of a two-span continuous girder bridge specimen which had been studied by the shaking table test was analyzed. Then, on the basis of the conventional plate rubber bearing system, the collapse control strategies which were high damping rubber bearing, fluid viscous damper, lock-up clutch control methods were discussed. It is found that high damping rubber bearing can delay the collapse time but the collapse mode remains the same; lock-up clutch has the best displacement control effect for the superstructure, but its energy consumption performance is not as good as that of a fluid viscous damper; high damping rubber bearing is quite suitable for protecting the substructure under short-period ground motion to avoid the bridge collapse caused by the failure of piers; fluid viscous damper and lock-up clutch are suitable for protecting the superstructure under long ground seismic motion to avoid the bridge non-use resulted from girder lowering; three collapse control methods can improve the anti-collapse ability of the bridge specimen, although no matter which control method is used, the bridge specimen may still collapse under strong earthquakes, but the target of postponing collapse time can be realized by means of various effective control methods.

Introduction of Shaking Table Test of Rigid Frame Bridge Model

2012 ◽  
Vol 256-259 ◽  
pp. 1492-1495
Author(s):  
Xiao Yu Yan
Keyword(s):  
Ground Motion ◽  
Soil Structure ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Soil Structure Interaction ◽  
Structure Interaction ◽  
Rigid Frame ◽  
Bridge Model ◽  
Support Excitation ◽  
Rigid Frame Bridge

To investigate the seismic response of long-span rigid frame bridges with high-pier, the shaking table test of a 1/10 scaled rigid frame bridge model is introduced in this paper. Details about test equipment, model design, test arrangement, input ground motion waves and test principle are provided. The response of bridge model under the seismic excitation included the uniform excitation and the multi-support excitation is observed. The influence of the soil-structure interaction on the bridge is considered through the real-time dynamic hybrid testing method. The impact effect for different ground motion input during the test is discussed. The influence of multi-support excitation, soil-structure interaction and impact effect on structural seismic responses are studied based on the test results. The isolation effectiveness and the damping effect are discussed as well.

Shake Table Studies on Viscous Dampers in Seismic Control of a Single-Tower Cable-Stayed Bridge Model under Near-Field Ground Motions

2018 ◽  
Vol 12 (05) ◽  
pp. 1850011 ◽  
Author(s):  
Jiang Yi ◽  
Jianzhong Li ◽  
Zhongguo Guan
Keyword(s):  
Ground Motions ◽  
Near Field ◽  
Far Field ◽  
Viscous Damper ◽  
Viscous Dampers ◽  
Damping Force ◽  
Seismic Control ◽  
Cable Stayed Bridge ◽  
Bridge Model ◽  
Cable Stayed Bridges

To investigate the effectiveness of viscous damper on seismic control of single-tower cable-stayed bridges subjected to near-field ground motions, a 1/20-scale full cable-stayed bridge model was designed, constructed and tested on shake tables. A typical far-field ground motion and a near-field one were used to excite the bridge model from low to high intensity. The seismic responses of the bridge model with and without viscous dampers were analyzed and compared. Both numerical and test results revealed that viscous dampers are quite effective in controlling deck displacement of cable-stayed bridges subjected to near-field ground motions. However, due to near-field effects, viscous damper dissipated most energy through one large hysteresis loop, extensively increasing the deformation and damping force demand of the damper. Further study based on numerical analysis reveals that to optimize deck displacement of cable-stayed bridges during an earthquake, a viscous damper with relatively larger damping coefficient should be introduced under near-field ground motions than far-field ones.

scholarly journals Effectiveness of fluid viscous damper for steel frame building subjected to earthquake load

2021 ◽  
Vol 263 ◽  
pp. 03015
Author(s):  
Thanh Binh Pham ◽  
Ngoc Quang Vu
Keyword(s):  
Dynamic Response ◽  
Time History ◽  
Steel Frame ◽  
Frame Structure ◽  
Seismic Load ◽  
Viscous Damper ◽  
Maximum Displacement ◽  
Fluid Viscous Damper ◽  
Frame Building ◽  
Earthquake Load

Since the appearance of the first modern multistories buildings, besides the demand of ensuring the bearing capacity, one of the urgent problems facing the engineer is to do how to design structure to ensure the requirements of normal use such as displacement, motion acceleration within permissible limits. There exist many methods to reduce these response of structure under lateral load. Among these, using fluid viscous damper (FVD) is one of the most applied equipment because of its simplicity. This paper presents the examination of eight-story steel frame structure subjected to seismic load. The FVD system is defined in Etabs with link properties. In each story, four dampers are located in each direction of plan, with two on each side of the center of stiffness of the story. The time history analysis was conducted to study the structure subjected to seimic load collected from the function library of program Etabs. The effect of FVD system was determined by the dynamic response of the building and displacement indexes such as maximum displacement of roof, story drift ratio. The results show that, all the dynamic response characters of structure were decreased significantly when providing the FVD to it.

PFC Simulation on Shaking Table Concrete-Faced Rockfill Dam Model Test

2010 ◽  
Vol 163-167 ◽  
pp. 4208-4212 ◽  
Author(s):  
Gui Yang ◽  
Yu Min Chen ◽  
De Qing Gao
Keyword(s):  
Model Test ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Particle Flow Code ◽  
Seismic Load ◽  
Centrifuge Model Test ◽  
Rockfill Dam ◽  
Continuity Assumption ◽  
The One ◽  
Concrete Face

The shape and seismic behavior of concrete-faced rockfill dams under designed seismic load are usually studied by shaking table test, dynamic centrifuge model test and finite element dynamic analysis. Particle flow code (PFC) simulation is analyzed based on the shaking table test, which overcomes the deficiency of macro-continuity assumption in continuum mechanics and can demonstrate the failure characters of dam under dynamic loading action intuitively and vividly. The law obtained from numerical simulation is almost consistent with the one obtained from the shaking table test. The simulation results indicate that the failure characters of concrete-faced rockfill dam are particle sliding on the dam surface and that the concrete face can efficiently reduce the slide displacement and dam top settlement.

scholarly journals Collapse Analysis of a Two-Span Reinforced Concrete Bridge Model

2021 ◽  
Vol 11 (19) ◽  
pp. 8935
Author(s):  
Yale Li ◽  
Zhouhong Zong ◽  
Bingwen Yang ◽  
Zhanghua Xia ◽  
Yuanzheng Lin ◽  
...  
Keyword(s):  
Ground Motion ◽  
Seismic Isolation ◽  
Shaking Table Test ◽  
Structural Response ◽  
Shaking Table ◽  
Collapse Mechanism ◽  
Girder Bridges ◽  
Bridge Model ◽  
Collapse Resistance ◽  
Collapse Mode

The continuous girder bridge is the main type of small- and medium-sized bridges; however, it has poor collapse resistance and suffers frequent earthquake damage. In order to grasp its collapse mechanism and clarify the internal and external factors affecting its collapse resistance, a 1:3-scaled, two-span bridge model subjected to shaking table test research was taken as the research object. The factors such as seismic characteristics, multi-directional seismic coupling, span, pier height, and structural system type were analyzed to determine the influences on the collapse mode of the bridge. The numerical results showed that different ground motion characteristics led to different collapse modes. Vertical ground motion had little effect on the structural response of the bridge. The change of span and pier height significantly changed the collapse resistance. A seismic isolation design could improve the anti-collapse performance, but the collapse mode varied with the system. The final anti-collapse design suggestions could provide reference for the seismic reinforcement of existing continuous girder bridges and the seismic design of continuous girder bridges that will be constructed.

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