工程力学 ›› 2019, Vol. 36 ›› Issue (11): 112-120.doi: 10.6052/j.issn.1000-4750.2018.11.0627

• 土木工程学科 • 上一篇    下一篇

应力集中致空心板L型裂缝研究

彭卫兵1, 史进1, 张武毅2, 张豪1, 卢成原1   

  1. 1. 浙江工业大学建筑工程学院, 浙江, 杭州 310014;
    2. 浙江交科工程检测有限公司, 浙江, 杭州 311215
  • 收稿日期:2018-11-20 修回日期:2019-04-10 出版日期:2019-11-13 发布日期:2019-04-12
  • 通讯作者: 卢成原(1964-),男,浙江东阳人,教授,硕士,从事结构工程研究(E-mail:jhbi@sohu.com). E-mail:jhbi@sohu.com
  • 作者简介:彭卫兵(1978-),男,江西樟树人,教授,博士,从事结构工程研究(E-mail:qhyqiaohaoyue@163.com);史进(1993-),男,江苏徐州人,硕士生,从事桥梁工程研究(E-mail:1121189176@qq.com);张武毅(1982-),男,浙江新昌人,高工,硕士,从事土木工程检测研究(E-mail:zhangwuyi001@163.com);张豪(1961-),男,江苏南京人,教授,博士,从事结构健康监测研究(E-mail:zhanghao@zjut.edu.cn).
  • 基金资助:
    国家自然科学基金项目(51778586);浙江省交通运输厅科技计划项目(2017003);浙江省交通运输厅科技计划项目(2018006)

STUDY ON L-TYPE CRACKS OF HOLLOW SLABS INDUCED BY STRESS CONCENTRATION

PENG Wei-bing1, SHI Jin1, ZHANG Wu-yi2, ZHANG Hao1, LU Cheng-yuan1   

  1. 1. College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China;
    2. Zhejiang Traffic Detection Co. LTD, Hangzhou, Zhejiang 310012, China
  • Received:2018-11-20 Revised:2019-04-10 Online:2019-11-13 Published:2019-04-12

摘要: 由于中小跨径桥梁大多采用标准图纸进行设计,空心板上混凝土栏杆跨中分缝是标准图中常见的方案。然而,浙江台金高速杨司高架桥混凝土栏杆跨中分缝后,空心板边板跨中大规模出现单一L型裂缝,暗示栏杆分缝与空心板开裂密切相关。该研究经过现场调研,系统搜集整理了事故桥的图纸、施工、材料及现场开裂信息,通过基于ABAQUS建立弹性和混凝土塑性损伤的事故桥的有限元模型,分析了新型L型裂缝的产生机理。研究结果表明:1)当栏杆和空心板固结时,栏杆分缝将引起刚度突变,导致应力集中,诱发出现穿过传统中和轴的L型裂缝;2)随着跨中空心板上栏杆预留缝宽度的减小和深度的增大,边板跨中底部应力逐渐增加;3)无论是弹性模型还是塑性损伤模型,不合理的分缝引起应力集中的趋势一致。该文的研究发现将改变量大、面广的空心板栏杆分缝传统方案,提升空心板使用性能。

关键词: 空心板, L型裂缝, 混凝土护栏, 分缝, 应力集中

Abstract: Normally small and medium span bridges are designed using standard drawings. In particular, the mid-span parting-line of concrete safety barrier on hollow slabs is a common design in standard drawings. However, large-scale L-type cracks appeared in the mid-span of side girder of Yangsi viaduct on Taijin Expressway because of the mid-span concrete safety barrier parting-line on hollow slabs, suggesting that the mid-span concrete safety barrier parting-line is related to the cracks. Site investigation was carried out and information on the bridge's drawings, construction, materials and cracking was collected. Elastic and plastic damage finite element models were established by using ABAQUS to analyze the cause of L-type cracks. The results demonstrated that:1) When the safety barrier and hollow slabs were consolidated, the safety barrier parting-line caused a sudden change in stiffness, resulting in stress concentration and subsequently L-type cracks through the traditional neutral axis; 2) With the decrease in the parting-line's width and the increase in the parting-line's depth, the stress at the mid-span bottom of the side girder gradually increased; 3) Regardless of the elastic model or the plastic damage model, the trend of stress concentration induced by improper mid-span concrete safety barrier was consistent. The findings of this study are expected to modify the traditional scheme of concrete safety barrier parting-line and improve the performance of hollow slabs.

Key words: hollow slab, L-type cracks, concrete safety barrier, parting-line, stress concentration

中图分类号: 

  • U443.5
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