本文研究分析城轨交通双曲面球型减隔震支座的减震机理,在高烈度震区条件下,以某城轨(131+160+111) m 大跨度连续梁桥为工程背景,建立空间三维有限元模型,对减隔震设计与传统抗震设计的经济性进行对比分析,同时进行了减隔震设计墩底内...本文研究分析城轨交通双曲面球型减隔震支座的减震机理,在高烈度震区条件下,以某城轨(131+160+111) m 大跨度连续梁桥为工程背景,建立空间三维有限元模型,对减隔震设计与传统抗震设计的经济性进行对比分析,同时进行了减隔震设计墩底内力响应减弱作用分析。结果表明:(1)轨道交通双曲面球型减隔震支座通过增加平面摩擦副,对保护震区桥梁具有显著作用。(2)城轨双曲面球型减隔震支座减震方案较传统减震设计方案更加经济合理,主体工程量明显减少。(3)在城轨双曲面球型减隔震支座下墩底纵、横桥向的内力响应大比例减小,最高达到76%,减震效果明显。这为后续大跨连续梁减隔震设计提供了参考依据。展开更多
The concepts of seismic isolation and energy dissipation structures emerged in the early 1970s.In China,the first seismic isolation structure was finished in 1993,and the first energy dissipation structure was built a...The concepts of seismic isolation and energy dissipation structures emerged in the early 1970s.In China,the first seismic isolation structure was finished in 1993,and the first energy dissipation structure was built at about the same time.Up to 2007,China had more than 600 seismic isolation and about 100 energy dissipation building structures.In 2008,the huge Wenchuan earthquake hit the southwest of China,which triggered a bloom of new seismic isolation and energy dissipation structures.This paper presents the development history and representative applications of seismic isolation and energy dissipation structures in China,reviews the state-of-the-practice of Chinese design,and discusses the challenges in the future applications.Major findings are as follows:Basic design procedures are becoming standardized after more than ten years of experiences,which mainly involve determination of design earthquake forces,selection of ground motions,modeling and time-history analyses,and performance criteria.Nonlinear time-history analyses using multiple ground motions are the characteristic of the design of seismic isolation and energy dissipation structures.Regulations,standardization and quality control of devices,balance between performance and cost,comparison with real responses,and regular inspection are identified as the issues that should be improved to further promote the application of seismic isolation and energy dissipation structures in China.展开更多
文摘本文研究分析城轨交通双曲面球型减隔震支座的减震机理,在高烈度震区条件下,以某城轨(131+160+111) m 大跨度连续梁桥为工程背景,建立空间三维有限元模型,对减隔震设计与传统抗震设计的经济性进行对比分析,同时进行了减隔震设计墩底内力响应减弱作用分析。结果表明:(1)轨道交通双曲面球型减隔震支座通过增加平面摩擦副,对保护震区桥梁具有显著作用。(2)城轨双曲面球型减隔震支座减震方案较传统减震设计方案更加经济合理,主体工程量明显减少。(3)在城轨双曲面球型减隔震支座下墩底纵、横桥向的内力响应大比例减小,最高达到76%,减震效果明显。这为后续大跨连续梁减隔震设计提供了参考依据。
基金supported by the National Natural Science Foundation of China (Grant No. 51178250)the Tsinghua University (Grant No.2010z01001)
文摘The concepts of seismic isolation and energy dissipation structures emerged in the early 1970s.In China,the first seismic isolation structure was finished in 1993,and the first energy dissipation structure was built at about the same time.Up to 2007,China had more than 600 seismic isolation and about 100 energy dissipation building structures.In 2008,the huge Wenchuan earthquake hit the southwest of China,which triggered a bloom of new seismic isolation and energy dissipation structures.This paper presents the development history and representative applications of seismic isolation and energy dissipation structures in China,reviews the state-of-the-practice of Chinese design,and discusses the challenges in the future applications.Major findings are as follows:Basic design procedures are becoming standardized after more than ten years of experiences,which mainly involve determination of design earthquake forces,selection of ground motions,modeling and time-history analyses,and performance criteria.Nonlinear time-history analyses using multiple ground motions are the characteristic of the design of seismic isolation and energy dissipation structures.Regulations,standardization and quality control of devices,balance between performance and cost,comparison with real responses,and regular inspection are identified as the issues that should be improved to further promote the application of seismic isolation and energy dissipation structures in China.
