地震落梁两级控制装置的开发与试验
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U442.5+5; TH122

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国家自然科学基金资助项目(51308293);江苏省自然科学基金资助项目(BK20130937);江苏省建设系统科技项目(2015ZD75)


Failure Control Device for Bridges During Earthquake
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    摘要:

    为了增强桥梁抗御地震落梁的能力,减轻交通生命线系统的震害损失,基于耗能减震、多级设防和结构分灾三个抗震性能设计理念,设计了一种具有耗能限位和上部体系连续化两级功能,并能在不同水准地震下自动实现功能转换的地震落梁控制装置。首先,分析了装置的构成、特点和工作机理,对第1级耗能限位组件进行了拟静力试验,测试了耗能滞回曲线;然后,对第2级拉索连梁组件进行了静力拉伸试验,评价了其变形性能、破坏形式和锚固性能;最后,对抗震销栓进行了剪切试验,考察了控制级别的转换,采用试验结果对有限元模拟结果进行了验证。研究表明,地震落梁两级控制装置具有有效的位移约束、合理的耗能机制和明确的分灾保险丝构造,实现了梁-梁连接和墩-梁连接控制模式的优势互补,实现了强震作用下对桥梁落梁失效的控制和对桥墩的安全保护。

    Abstract:

    In order to enhance the unseating prevention capacity of bridge and reduce the seismic loss of transportation lifeline system, a new control device for the seismic unseating prevention of bridges is developed according to the conceptions of energy dissipation, multi-failure and damage reduction. The device provides two different control types of performance including energy dissipation-based displacement restriction and unseating prevention, and these two level control types can be automatically transformed. Firstly, the composition, characteristics and the working mechanism of the device are analyzed. Then, a quasi-staic experiment is conducted to examine the hysteretic curve of the energy dissipation-based displacement restriction unit of the first-level control. Then, a static tensile experiment is conducted to investigate the deformation characteristics, the failure mode and the anchoring capacity of the cable restrainer unit on the second-level control. In addition, a bolt shear experiment is conducted to examine the control conversion function. Finally, our finite element simulation method is verified by the experimental results. The results indicate that the twol-evel control device for seismic unseating failure has an effective displacement constraint capacity, a reasonable energy dissipation mechanism and a distinct structure of damage-reduction fuse. The device achieves complementary advantages between its girder-girder connection and pier-girder connection control mode, providing a reliable guarantee for unseating prevention and a safety protection of bridge pier in strong earthquake.

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  • 在线发布日期: 2019-05-13
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