高寒地区后张PC梁孔道冻胀损伤研究

孙宝林; 杨永清; 黄胜前; 高玉峰; 余小华; 李凯; 杨成龙

doi:10.3969/j.issn.0258-2724.20210004

高寒地区后张PC梁孔道冻胀损伤研究

doi: 10.3969/j.issn.0258-2724.20210004

1.
西南交通大学土木工程学院，四川成都 610031
2.
四川交大工程检测咨询有限公司，四川成都 610031

基金项目: 中国国家铁路集团有限公司科技研究开发计划（P2019T001）

详细信息

作者简介:
孙宝林（1992—），男，博士研究生，研究方向为预应力混凝土桥梁结构行为，E-mail：sunbaolinx@163.com

通讯作者:
杨永清（1965—），男，教授，博士，研究方向为大跨度桥梁结构行为、新建桥梁及既有桥梁结构评估，E-mail：yangyongqingx@163.com

中图分类号: U441.5；U447
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- 被引次数: 0
出版历程
- 收稿日期: 2021-01-07
- 修回日期: 2021-09-20
- 网络出版日期: 2023-01-07
- 刊出日期: 2021-10-20

Damage of Post-Tensioned PC Girders in Alpine Regions Due to Frost Heaving in Ducts

1.
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
2.
Sichuan Jiaoda Engineering Detection & Consulting Co., Ltd., Chengdu 610031, China

摘要

摘要:
预应力孔道内压浆料浆液及自由水冻胀致使混凝土沿纵向开裂，是高寒地区后张预应力混凝土（PC）梁特有的病害，严重影响结构的安全性、适用性、耐久性. 为了明确病害特征，对冻胀受损梁体进行钻孔和解剖检测，进一步精细定量地研究冻胀效应，采用有限元软件ABAQUS建立孔道冻胀非线性模型，开展压浆料浆液冻胀行为分析和自由水冻胀参数分析，研究孔道内压浆液冻胀率和自由水体积的控制指标. 研究结果表明：高寒地区后张PC结构孔道压浆后，受冻并先后发生压浆料浆液冻胀和自由水冻胀，致使孔道周围混凝土反复受拉而沿纵向开裂；压浆料浆液的体积膨胀率宜控制在0.80%以内，最高不得超过1.73%；泌水体积比宜控制在0.04%以内，最高不得超过0.52%，由此可有效降低孔道内压浆液及自由水冻胀的风险.
- 高寒地区 /
- 后张PC梁 /
- 纵向裂缝 /
- 检测 /
- 孔道 /
- 压浆料浆液冻胀 /
- 自由水冻胀 /
- 非线性分析
Abstract:
Longitudinal cracks of concrete caused by frost heaving of grouting slurry and free water in ducts is a special damage of post-tensioned PC girders in alpine regions, which affects the safety, serviceability, and durability of the structures significantly. In order to study damage characteristics, borehole and anatomical detections were conducted on damaged girders. The finite element software ABAQUS was used to establish the nonlinear models of frost heaving. Frost heave analysis of grouting slurry and parametric analysis of free water were carried out to study frost heave effects quantitatively. Control indexes of the frost heave ratio of grouting slurry and the volume of free water were obtained. The results show that the frost heaving of grouting slurry and free water occurs successively after grouting the ducts of the post-tensioned PC structures in alpine region, causing concrete to be tensioned repeatedly and cracked along the longitudinal direction. The volume expansion ratio of grouting slurry needs to be controlled within 0.80%, and the maximum should not exceed 1.73%. The volume ratio of bleeding water should be controlled within 0.04%, and the maximum should not exceed 0.52%. Thus, the frost heaving risk of grouting slurry and free water in ducts can be reduced effectively.
- alpine region /
- post-tensioned PC girder /
- longitudinal crack /
- detection /
- duct /
- frost heaving of grouting slurry /
- frost heaving of free water /
- nonlinear analysis.

HTML全文

图 1 箱梁跨中截面

Figure 1. Cross section of mid-span of box girders

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图 2 箱梁纵向裂缝

Figure 2. Longitudinal cracks of box girders

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图 3 钻孔及解剖检测结果

Figure 3. Results of borehole and anatomical detections

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图 4 箱梁预制及养护期间环境温度记录

Figure 4. Records of environmental temperature during prefabrication and curing of box girders

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图 5 冻胀示意

Figure 5. Schematic diagram of frost heaving

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图 6 冻胀模型

Figure 6. Frost heave models

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图 7 混凝土塑性损伤

Figure 7. Concrete damaged plasticity

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图 8 压浆料浆液冻胀效应

Figure 8. Frost heaving effect of grouting slurry

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图 9 单元位置

Figure 9. Element position

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图 10 主拉应力和主拉应变

Figure 10. Principal tensile stress and principal tensile strain of elements

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图 11 自由水冻胀效应

Figure 11. Frost heaving effect of free water

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图 12 冻胀参数分析结果

Figure 12. Parametric analysis results of frost heaving

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