ECC桩-消能锚韧性支挡结构地震响应规律研究
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重庆大学 土木工程学院

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中图分类号:

TU435

基金项目:

国家自然科学基金(52178312);重庆市自然科学基金创新群体科学基金(cstc2020jcyj-cxttX0003)


Study on seismic response law of ECC pile-energy dissipation anchor ductile retaining structure
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Affiliation:

School of Civil Engineering

Fund Project:

National Natural Science Foundation of China (No. 52178312) ;The innovation and group science fund of natural science fund of Chongqing(cstc2020jcyj-cxttX0003)

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    摘要:

    桩锚结构作为地震滑坡治理中最常见的支护结构体系之一,如何提升其强震作用下的抗震韧性是值得研究的问题。本研究提出在锚索上设置黏滞阻尼器,并使用ECC材料制作抗滑桩构建新型桩锚结构体系,优化了桩锚结构抗震性能。通过振动台试验,从宏观破坏现象、模型动力特性、加速度响应、桩身位移响应、动态弯矩响应、动态轴力响应等方面获得了新型桩锚结构的动力响应规律,以此揭示了新型桩锚结构的抗震性能和作用机理。试验结果表明,阻尼器的设置可以降低锚索动态轴力以及传递至桩身的地震能量,而ECC材料的使用则可以有效提高桩身韧性,增强地震作用下抗滑桩的耗能能力。二者的联合使用显著提高了支护结构的抗震性能。研究结果可以为锚索抗滑桩结构抗震性能优化和设计提供参考依据。

    Abstract:

    Pile-anchor structure is one of the most common supporting structures in earthquake and landslide control. How to improve its seismic toughness under strong earthquakes is a problem worth studying. In this study, a viscous damper is set on the anchor cable, and ECC materials are used to make anti-slide piles to construct a new type of pile-anchor structure system, which optimizes the seismic performance of the pile-anchor structure. Through shaking table test, the dynamic response laws of the new pile-anchor structure are obtained from the aspects of macroscopic failure phenomenon, model dynamic characteristics, acceleration response, pile displacement response, dynamic bending moment response, dynamic axial force response, etc., so as to reveal the seismic performance and action mechanism of the new pile-anchor structure. The test results show that the installation of the damper can reduce the dynamic axial force of the anchor cable and the seismic energy transferred to the pile, and the use of ECC material can effectively improve the toughness of the pile and enhance the energy dissipation capacity of the anti-slide pile under earthquake action. The combined use of the two can significantly improve the seismic performance of the supporting structure. The research results can provide reference for the seismic performance optimization and design of pile-anchor structure.

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  • 收稿日期:2023-11-20
  • 最后修改日期:2024-02-29
  • 录用日期:2024-03-23
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