Study on Seismic Mitigation of Elastic Cables on Long-Span Cable-Stayed Bridges by Shaking Table Test

2020 ◽  
pp. 281-299
Author(s):  
Li Xu ◽  
Qunjun Huang ◽  
Junhao Zheng ◽  
Kang Liu
Keyword(s):  
Shaking Table Test ◽  
Shaking Table ◽  
Long Span ◽  
Elastic Cables ◽  
Cable Stayed Bridges ◽  
Seismic Mitigation

Simplified analysis of cable-stayed bridges with longitudinal viscous dampers

2020 ◽  
Vol 27 (8) ◽  
pp. 1993-2022
Author(s):  
Xu Li ◽  
Jun Li ◽  
Xiaoyi Zhang ◽  
Jianfeng Gao ◽  
Chao Zhang
Keyword(s):  
Shaking Table Test ◽  
Damping Ratio ◽  
Shaking Table ◽  
Great Success ◽  
Viscous Dampers ◽  
Content Type ◽  
Equivalent Damping ◽  
Long Span ◽  
Simplified Method ◽  
Cable Stayed Bridges

PurposeViscous dampers are commonly used in large span cable-stayed bridges to mitigate seismic effects and have achieved great success.Design/methodology/approachHowever, the nonlinear analysis on damper parameters is usually computational intensive and nonobjective. To address these issues, this paper proposes a simplified method to determine the viscous damper parameters for double-tower cable-stayed bridges. An empirical formula of the equivalent damping ratio of viscous dampers is established through decoupling nonclassical damping structures and linearization of nonlinear viscous dampers. Shaking table tests are conducted to verify the feasibility of the proposed method. Moreover, this simplified method has been proved in long-span cable-stayed bridges.FindingsThe feasibility of this method is verified by the simplified model shaking table test. This simplified method for determining the parameters of viscous dampers is verified in cable-stayed bridges with different spans.Originality/valueThis simplified method has been validated in cable-stayed bridges with various spans.

Seismic Mitigation Assessment of Building Using Multiple Direction Optimized-Friction Pendulum System

2008 ◽  
Author(s):  
C. S. Tsai ◽  
Wen-Shin Chen ◽  
Yung-Chang Lin ◽  
Chi-Lu Lin
Keyword(s):  
Finite Element ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Finite Element Formulation ◽  
Element Formulation ◽  
Natural Period ◽  
Pendulum System ◽  
Friction Pendulum ◽  
Seismic Mitigation ◽  
Friction Pendulum System

In order to prevent a building near a fault from earthquake damage, in this study an advanced base isolation system called the multiple direction optimized-friction pendulum system (Multiple DO-FPS or MDO-FPS) is proposed and examined to address its mechanical behavior through the finite element formulation and evaluate its efficiency in seismic mitigation through a series of shaking table tests. On the basis of the finite element formulation, it is revealed that the natural period, the capacity of the bearing displacement and damping effect for the Multiple Direction Optimized-Friction Pendulum System (Multiple DO-FPS) change continually during earthquakes. Therefore, the MDO-FPS isolator can avoid possibility of resonance of enriched frequencies from ground motions and provide an efficient capacity of the bearing displacement and damping during the earthquakes. Simultaneously, the shaking table test results also illustrate that the Multiple DO-FPS isolator possesses an outstanding seismic mitigation capabilities.

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.

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