基于服役锚垫板和外置钢锚筒的斜拉索更换系统静力承压试验
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1.中铁一局集团第二工程有限公司;2.中交公路规划设计院有限公司桥隧监测养护分公司;3.北京工业大学;4.北京市市政工程设计研究总院有限公司

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TU744

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Compression Static Test of a Cable-stayed replacement System Based on In-service Archor Plate and External Steel Anchor Barrel
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China Railway First Group Second Engineering Co.LTD

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    摘要:

    为实现超设计使用年限或发生严重损伤的斜拉索安全高效更换,本文提出了一种利用既有斜拉索锚垫板为反力系统的外置钢锚筒换索系统,设计制作了典型主梁节段缩尺模型及临时索系统全尺模型,开展了外置钢锚筒-锚垫板干接触、胶接条件下的单向轴压和偏心受压静力试验。结果表明,干接触条件下钢锚筒失效模式为偏心受压侧顶端与锚垫板接触处屈曲,灌注环氧树脂胶接触条件下其失效模式为偏心受压侧环氧树脂胶界面处屈曲。相同荷载工况下灌注胶后的钢锚筒位移及最大压应力较小,钢锚筒的受压安全性和稳定性较好。该型辅助构件可用于斜拉桥换索施工中。

    Abstract:

    To achieve safe and efficient replacement of stay cables that exceeded their designed service life or suffer serious damage, this study proposed a stay-cable replacement system (SRS) which used the existing cable-stayed anchor plate (ECAP) as a reaction force system. The scaled model of the typical main girder segment and the full-scale model of the SRS were designed and produced. The axial compression and eccentric compression static tests were carried out under the conditions of dry contact and adhesive contact between the steel anchor barrel (SAB) of SRS and the ECAP. The results show that, under dry contact conditions, the failure mode of the SAB is the buckling of the contact point between the eccentric compression side of the SAB end and the ECAP; under adhesive contact conditions, the failure mode of the SAB is the buckling at the interface between the eccentric compression side of the SAB and the epoxy resin glue. After pouring of the epoxy resin glue, the displacement and maximum compressive stress of the SAB are smaller, and the compressive safety and stability of the SAB are better. The proposed SRS can be applied in stay-cable replacement.

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田纲,陈超,贾闯,等. 基于服役锚垫板和外置钢锚筒的斜拉索更换系统静力承压试验[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-12-27
  • 最后修改日期:2024-04-25
  • 录用日期:2024-05-02
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