梁拱组合体系桥梁断索效应及安全评价
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作者单位:

1.长安大学;2.陕西建工机械施工集团有限公司;3.陕西建工投资项目管理有限公司

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中图分类号:

TU398.7

基金项目:

陕西省交通运输厅2021年度交通科研项目(21-63K).


Cable Breakage Effect and Safety Evaluation of Beam Arch Combination System Bridge
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Affiliation:

1.Chang’an University;2.SCEGC Mechanized Construction Group Company Ltd.;3.Shaanxi Construction Project Management Co., Ltd

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    摘要:

    为了分析梁拱组合体系桥梁发生断索效应对结构安全性的影响,本文依托陕西省某在建梁拱组合桥梁,采用有限元数值模拟的方法,对运营期间多种“吊杆突然断裂”的状况进行了动力响应分析以及安全性评价。结果表明: 受梁-拱组合结构“墩-梁-拱”三者结合作用,断索跨的断索冲击效应显著并对相邻跨有一定的影响,但对其余跨几乎无影响;不同数量的断索发生后结构振动在5s时间内基本趋于稳定,断索后三种情景下主梁响应幅度相对较小,拱肋相对较大,拱肋动力放大系数(Dynamic Amplification Factor— DAF)最大达到了10.5,动力作用下吊杆的需求能力比(Demand Capacity Ratio—DCR)有大幅提高。依托工程在发生断索后短时间内吊杆内力会有数倍的增加,各情景下吊杆动力DCR最大值为40.3%,结构安全储备大幅下降,表明桥梁在断索振动的过程中有吊杆连续断裂的危险,运营过程中应特别注意此类安全事故发生。

    Abstract:

    To investigate the structural safety implications of cable rupture on the arch bridge system, this study focuses on an under-construction arch bridge in Shaanxi Province, employing finite element numerical simulations. Various scenarios of "sudden cable rupture" during operation are subjected to dynamic response analysis and safety assessment. Results demonstrate that the combined effects of the pier-beam-arch structure significantly impact adjacent spans while minimally affecting others. Structural vibrations stabilize within 5 seconds post-rupture, with main beam responses exhibiting minor amplitudes compared to larger ones in the arch rib. The maximum dynamic amplification factor (DAF) for the arch rib reaches 10.5, and the demand-capacity ratio (DCR) of hangers substantially increases under dynamic loading. Hanger forces experience a several-fold increase shortly after cable rupture, with a maximum DCR of 40.3%, indicating a significant reduction in structural safety reserves. The potential for consecutive hanger ruptures during cable vibration highlights the necessity for heightened safety vigilance during bridge operation.

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闫磊,惠启祥,闵林涛,等. 梁拱组合体系桥梁断索效应及安全评价[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-09-20
  • 最后修改日期:2024-05-11
  • 录用日期:2024-05-15
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