徐盐新洋港斜拉桥地震响应及减震分析
An Analysis of the Earthquake Response and Seismic Mitigation of the Xinyanggang Cable Stayed Bridge of the Xuyan High Speed Railway
  
中文关键词:高速铁路  斜拉桥  结构体系  减震措施  粘滞阻尼器参数
英文关键词:high speed railway  cable stayed bridge  structural system  shock absorption measures  parameters of the viscous damper
基金项目:
作者单位
黄庭森 中铁第五勘察设计院集团有限公司, 北京102600 
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中文摘要:
      通过对不同体系抗震设计经济成本、不同减震措施的减震率、粘滞阻尼器参数等方面进行研究分析,确定徐盐高速铁路新洋港大桥合理、经济的抗震设计方案,为今后类似斜拉桥的抗震设计提供参考。研究结果表明:结合桥址地质条件,支承体系抗震设计相关成本为半漂浮体系的1.3倍左右;粘滞阻尼器对塔底弯矩及梁端位移的减震率均在40%以上,而摩擦摆支座减震率仅在10%左右;对粘滞阻尼器进行了参数分析,塔底弯矩-阻尼系数曲线存在拐点,塔底弯矩先减小后增大;梁端纵向位移与阻尼系数呈负相关关系,与阻尼指数呈正相关关系。综合生产条件及经济成本考虑,建议粘滞阻尼器参数选为C=4 000 kN·(m·s-1)α,阻尼指数α=0.2。
英文摘要:
      Through the study and analyses of the economic cost of the seismic design of different systems, the damping rate of different seismic measures, the parameters of viscous dampers, etc., a reasonable and economical seismic design scheme for the Xinyanggang Bridge of the Xuyan High speed Railway is worked out in the present paper, which could provide certain useful reference for the seismic design of other similar cable stayed bridges. The results of our research show that: considering the geological conditions of the bridge site, the relevant cost of the seismic design of the supporting system is about 1.3 times that of the half floating system; the damping rate of the viscous damper for the bending moment of the pylon bottom and the displacement of the beam end is both above 40%, while the damping rate of the friction pendulum bearing is only about 10%; the longitudinal displacement of the beam end is negatively correlated with the damping coefficient and positively correlated with the damping index. Upon the basis of taking account of both the production conditions and the economic costs, it is advisable that the parameter of the damper should choose C=4 000 kN·(m·s-1)α,and the damping index should be α=0.2.
黄庭森.徐盐新洋港斜拉桥地震响应及减震分析[J].国防交通工程与技术,2021,19(1):30~33,58
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