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凸型铸铁索鞍下混凝土基座的抗压性能分析
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作者单位:

(中交第一公路勘察设计研究院有限公司, 西安 710065)

作者简介:

Yuan Yuan, Ph.D, Senior Engineer. Graduated from Tongji Uni-versity. CCCC First Highway Consultants Co., Ltd., Xi'an Shaanxi 710065, China.

通讯作者:

Yuncheng Feng

中图分类号:

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Analysis of Local Compressive Behaviour of Concrete Mount Under Cambered Cast Iron Cable Saddle
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(CCCC First Highway Consultants Co., Ltd. Xi'an 710065, China)

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    摘要:

    桥塔顶部的索鞍不仅帮助主缆通过设计形式的顶点,还将巨大的荷载传递给桥塔。单塔双跨斜拉桥采用埋入式铸铁索鞍,索鞍预埋在混凝土基座内。由于该预埋索鞍的底面呈倒凸字形,与混凝土基座接触部分的局部压应力分布不均。采用有限元方法研究混凝土基座的局部压缩行为的特点。根据研究结果,非均匀局部压缩的折减系数约为0.73。通过理论验证,该索鞍结构可以满足局部承压承载力。建议在局部承压区域布置间接钢筋,以便结构在正常使用极限状态下的保持良好状态。

    Abstract:

    The cable saddle on top of pylon not only helps the main cable pass through the summit of design form, but also transmits the enormous force to the pylon. An imbedded cast iron cable saddle is going to be adopted for a single pylon and two span cable stayed bridge. A cast in situ concrete foundation, which is called a concrete mount in this context, bears the imbedded cable saddle underneath. Due to the cambered shape of the bottom face of this imbedded cable saddle, the local compressive stress distribution on the contact part with the concrete mount may not be uniform. The finite element method is used to investigate the feature of the local compressive behaviour for the concrete mount. According to the results, the reduction factor for nonuniform local compression is approximately 0.73. This cable saddle structure could meet the local compression bearing capacity via theoretical verification, and indirect reinforcement under local compressive pressure is recommended to keep the structure in good condition for the serviceability limit state.

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引用本文

Yuan Yuan, Guanhua Liu, Songlin Song, Yuncheng Feng Analysis of Local Compressive Behaviour of Concrete Mount Under Cambered Cast Iron Cable Saddle. Prestress Technology 2023,1(01):30-38. 10.59238/j. pt.2023.01.003

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  • 收稿日期:2023-02-20
  • 最后修改日期:2023-03-14
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  • 在线发布日期: 2023-06-21
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