薛淑友, 郝洪, 郝逸飞. 预制混凝土节段拼装桥墩抗车撞性能数值研究[J]. 工程力学, 2023, 40(7): 59-74. DOI: 10.6052/j.issn.1000-4750.2021.11.0907
引用本文: 薛淑友, 郝洪, 郝逸飞. 预制混凝土节段拼装桥墩抗车撞性能数值研究[J]. 工程力学, 2023, 40(7): 59-74. DOI: 10.6052/j.issn.1000-4750.2021.11.0907
XUE Shu-you, HAO Hong, HAO Yi-fei. NUMERICAL INVESTIGATION FOR IMPACT PERFORMANCE OF PRECAST CONCRETE SEGMENTAL PIERS SUBJECTED TO VEHICLE COLLISION[J]. Engineering Mechanics, 2023, 40(7): 59-74. DOI: 10.6052/j.issn.1000-4750.2021.11.0907
Citation: XUE Shu-you, HAO Hong, HAO Yi-fei. NUMERICAL INVESTIGATION FOR IMPACT PERFORMANCE OF PRECAST CONCRETE SEGMENTAL PIERS SUBJECTED TO VEHICLE COLLISION[J]. Engineering Mechanics, 2023, 40(7): 59-74. DOI: 10.6052/j.issn.1000-4750.2021.11.0907

预制混凝土节段拼装桥墩抗车撞性能数值研究

NUMERICAL INVESTIGATION FOR IMPACT PERFORMANCE OF PRECAST CONCRETE SEGMENTAL PIERS SUBJECTED TO VEHICLE COLLISION

  • 摘要: 预制节段拼装桥墩存在施工周期短,对交通和环境影响小等优势。随着经济的快速发展和城市化进程的加快,车辆撞击桥墩的事件增加,在极端情况下可能还会导致桥梁整体倒塌。然而,关于这种结构形式的抗车辆撞击性能研究仍较为匮乏,因此,非常有必要开展这方面的研究。该文基于显式动力分析软件ANSYS/LS-DYNA对车辆撞击预制混凝土节段拼装桥墩开展数值模拟工作,在保证数值模型合理性与准确性的基础上,探究几何与构造等因素对节段拼装桥墩抗车辆撞击性能的影响,具体包括截面类型、预应力筋以及剪力键布置等。结果表明:圆形截面相比于方形截面具有更好的抗车辆撞击性能;周边布置预应力筋相较于中心布置能够给节段拼装桥墩提供更好的抗车辆撞击性能;圆柱形混凝土剪力键能够通过提高节段拼装桥墩的整体性来提升节段拼装桥墩的抗车辆撞击性能。基于研究结果的综合考虑,对于实际工程应用问题,应将预制拼装桥墩按圆形截面设计,并采用周边布置预应力筋及节段中心布置剪力键的形式。

     

    Abstract: Precast concrete segmental piers (PCSCs) have many advantages such as the short construction time and low traffic and environmental impacts. With the rapid economic development and urbanization, the events of vehicle collision onto bridge piers have been increasing, which in extreme situations may lead to the collapse of the bridge. However, the research on the impact performance of PCSCs under vehicle collision is still limited. Hence it is particularly necessary to carry out the related research. In this study, the numerical simulation of PCSCs under vehicle collision was carried out by the grounds of the explicit dynamic analysis software ANSYS/LS-DYNA. Based on ensuring the rationality and accuracy of the numerical model, the influence of geometric and design parameters on the impact performance of PCSCs under vehicle collision was investigated. These factors included cross-sectional geometry and the arrangement of prestressed tendons and shear keys. The results show that the circular section has better impact performance than the square section under vehicle collision. Besides, compared with the central arrangement, the peripheral prestressed tendons can provide better impact performance for PCSCs under vehicle collision. Moreover, cylindrical concrete shear keys can improve the impact performance of PCSCs by improving the integrity of segmental piers. Based on the research results, for the practical engineering application, PCSCs are better designed with the circular cross-section, and the prestressed tendons should be arranged around the periphery and the shear keys need be arranged at the center of segments.

     

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