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基于弹性防偏-塑性卸载机理的梁体横向限位设备

赵成功 赵人达 贾毅 王永宝 李福海

赵成功, 赵人达, 贾毅, 王永宝, 李福海. 基于弹性防偏-塑性卸载机理的梁体横向限位设备[J]. 西南交通大学学报, 2021, 56(4): 760-768. doi: 10.3969/j.issn.0258-2724.20190741
引用本文: 赵成功, 赵人达, 贾毅, 王永宝, 李福海. 基于弹性防偏-塑性卸载机理的梁体横向限位设备[J]. 西南交通大学学报, 2021, 56(4): 760-768. doi: 10.3969/j.issn.0258-2724.20190741
ZHAO Chenggong, ZHAO Renda, JIA Yi, WANG Yongbao, LI Fuhai. Lateral Displacement Restrainer of Beam Based on Elastic Deviation Prevention and Plastic Unloading Mechanism[J]. Journal of Southwest Jiaotong University, 2021, 56(4): 760-768. doi: 10.3969/j.issn.0258-2724.20190741
Citation: ZHAO Chenggong, ZHAO Renda, JIA Yi, WANG Yongbao, LI Fuhai. Lateral Displacement Restrainer of Beam Based on Elastic Deviation Prevention and Plastic Unloading Mechanism[J]. Journal of Southwest Jiaotong University, 2021, 56(4): 760-768. doi: 10.3969/j.issn.0258-2724.20190741

基于弹性防偏-塑性卸载机理的梁体横向限位设备

doi: 10.3969/j.issn.0258-2724.20190741
基金项目: 国家自然科学基金(编号:51778531);The National Natural Science Foundation of China(51778531)
详细信息
    作者简介:

    赵成功(1985—),男,博士研究生,研究方向为桥梁加固技术及新型混凝土在桥梁加固,E-mail:406689847@qq.com

  • 中图分类号: U448.27; U448.216

Lateral Displacement Restrainer of Beam Based on Elastic Deviation Prevention and Plastic Unloading Mechanism

  • 摘要: 为了缓解桥梁梁体在各类因素下的横向偏移或倾覆问题,同时改良现有防偏移设备的刚性阻拦缺陷,以机械设备的减震隔震装置为借鉴,设计了一种基于弹性防偏-塑性卸载理念的梁体横向限位设备. 该设备根据折减后的桥墩墩底抗弯强度及梁体横向最大容许位移选择弹簧参数(用于正常情况下的弹性防偏),由折减后的支反力计算薄弱层锚固螺栓的个数(用于大荷载下的卸载保墩).以陕西某曲线连续梁桥为例,以未安装设备桥梁模型为基准,通过有限元分析软件Midas Civil模拟无设备桥梁及有设备后的桥梁在静、动力作用下的位移增量及应力增量. 数据对比显示:该设备在限制各静力作用下的径向爬移效果显著(平均位移限制率达70%以上,主要位移诱因的限制率达80%以上);在El Centro Site波大部分时程内,有设备梁体的位移增量和应力增量值较无设备梁体的小,且安装设备后峰值位移(降低率均在90%以上)及峰值应力(平均降低率达50%左右)得到明显降低,这说明该设备可在避免应力集中的情况下,有效减小梁体的动力位移增量,具有良好的抗震/防偏移效果.

     

  • 图 1  无盖梁桥梁防偏移设备示意

    Figure 1.  Diagram of deviation-prevention equipment for bridges without bent caps

    图 2  有盖梁桥梁防偏移设备示意

    Figure 2.  Diagram of deviation-prevention equipment for bridges with bent caps

    图 3  力-位移关系曲线

    Figure 3.  Force-displacement relation curve

    图 4  弹簧系统模型

    Figure 4.  Elasticity model for spring system

    图 5  Midas Civil模型

    Figure 5.  Models of Midas Civil

    图 6  各类作用下位移对比

    Figure 6.  Displacement comparison under various kinds of actions

    图 7  安装防偏移设备前、后桥梁在地震作用下位移曲线

    Figure 7.  Displacement curves for bridges with and without deviation-prevention equipment in earthquake

    图 8  安装防偏移设备前、后桥梁在地震作用下应力增量

    Figure 8.  Stress increments of bridges with and without deviation-prevention equipment in the earthquake

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出版历程
  • 收稿日期:  2019-07-28
  • 修回日期:  2020-02-18
  • 网络出版日期:  2020-04-16
  • 刊出日期:  2021-08-15

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