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| Research on the Anti - seismic Measures for Long - span Three - pylon Cable - stayed Bridges |
| LI Xiao - zhen1, TAN Qing - quan1, XIAO Lin1, SHI Jian - hua2 |
| (1. Southwest Jiaotong University，Chengdu, Sichuan 610031, China; 2. China Railway Major Bridge Reconnaissance & Design Institute Co. Ltd，Wuhan，Hubei 430050, China) |
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Abstract Abstract：Research purposes ： The seismic response of Erqi Yangzi River Bridge in Wuhan， with different girder supporting systems and viscous damper parameters was studied to investigate the anti - seismic measures for long - span three - pylon cable - stayed bridges. A number of nonlinear time - history analyses were conducted focusing on different deck support systems: simply supporting, floating and rigid system; Meanwhile, the sensibility of viscous damper’s two parameters： damping coefficient C and damping exponent a was researched. Research conclusions:(1) Each of the three support systems has its good points on internal force or deformation, but simply supporting system is suitable of long - span three - pylon cable - stayed bridges taking a comprehensive consideration of internal force and deformation. （2) Seismic response is sensible to damping exponent a ranging from 0. 3 to 0. 5. The appropriate seismic response is gained when the damping parameters are taking as damping coefficient C=5 000 kN/(m ? s )a， damping exponent a =0.3. (3) The research results can give references for the seismic deign of similar bridges.
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Received: 21 December 2015
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2016, Vol. 33 
