不同吊杆形式下人行悬索桥的力学性能分析
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国家自然科学基金(51778377,51908382); 河北省大型结构健康诊断与控制重点实验室开放基金课题(KLLSHMC2112)


Mechanical property analysis for suspension footbridge with different hanger systems
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    摘要:

    为了研究吊杆形式对人行悬索桥力学性能的影响,以某人行悬索桥为工程背景,采用Midas/Civil软件分别建立竖直吊杆和倾斜吊杆2种形式下的人行悬索桥有限元模型,进行合理成桥状态的找形计算,并对2种模型的静、动力性能进行分析。结果表明:1)竖直吊杆模型内部吊杆内力大小均匀,影响线均为正值,倾斜吊杆模型内部外倾吊杆内力大于内倾吊杆,且影响线有正有负。2)竖直吊杆模型主缆内力变化平缓,主梁基本不产生轴力,主缆和主梁位移较大;倾斜吊杆模型主缆内力变化梯度较大,数值较小,主梁有轴力,主缆和主梁位移较小。3)倾斜吊杆模型前10阶振动频率均大于竖直吊杆模型;在静风荷载作用下,2种模型中抗风揽体系的内力和位移差别不大,受吊杆形式的影响较小。4)倾斜吊杆模型的横向和竖向刚度均大于竖直吊杆模型,比较适合活载较小的人行悬索桥。对采用竖直吊杆体系和倾斜吊杆体系的人行悬索桥从静力和动力性能2个角度进行了全面的比较分析,为该类桥梁的结构体系优化提供了理论依据。

    Abstract:

    To research the influence of the hanger system on the mechanical properties of suspension footbridge,the finite element models of a suspension footbridge with vertical and inclined hanger systems were established respectively by using Midas/Civil software.The calculation of finding reasonable cable shape was carried out,and the static and dynamic properties of the two models were analyzed.The results indicate that,the internal force of the vertical hanger is uniform,and the influence line is positive,while the internal force of the outward-tilting inclined hanger is larger than that of the inward-tilting hanger,and the influence line has both positive and negative value;In the vertical hanger model,the internal force of the main cable is basically uniformly distributed with almost no axial force in the main beam and larger displacement in both the main cable and the main beam.Compared with the vertical hanger model,the declined hanger model has larger gradient but smaller value in the internal force of the main cable,larger axial force in the main beam,smaller displacement in both the main cable and the main beam,and larger vibration frequencies in first ten order modes.Under the static wind load,the internal force and displacement of the wind resistance system in both two models are similar to each other,and are less affected by the hanger form.Both the lateral and vertical stiffness of the inclined hanger model are larger than those of the vertical hanger model,which is more suitable for suspension footbridge with small live load.The suspension footbridge with vertical suspender system and inclined suspender system can be comprehensively compared and analyzed from the perspective of static and dynamic performance,which provides a theoretical basis for the structural system optimization of this kind of bridge.

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李运生,许雅倩,王泽涵,侯忠明.不同吊杆形式下人行悬索桥的力学性能分析[J].河北科技大学学报,2022,43(2):162-171

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  • 收稿日期:2021-11-17
  • 最后修改日期:2022-03-01
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  • 在线发布日期: 2022-05-03
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