温升作用下CRTS<b>Ⅱ</b>型板宽窄接缝受力及损伤分析

刘笑凯; 刘学毅; 肖杰灵; 董佳佳

doi:10.3969/j.issn.0258-2724.20210946

温升作用下CRTSⅡ型板宽窄接缝受力及损伤分析

doi: 10.3969/j.issn.0258-2724.20210946

刘笑凯^{1, 2, 3,},
刘学毅^{1, 2},
肖杰灵^{1, 2, ,},
董佳佳^{1, 2}

1.
西南交通大学高速铁路线路工程教育部重点实验室，四川成都 610031
2.
西南交通大学土木工程学院，四川成都 610031
3.
中北大学环境与安全工程学院，山西太原 030051

基金项目: 国家自然科学基金（51978584，51778543）；山西省基础研究计划（20210302124452）

详细信息

作者简介:
刘笑凯（1990—），男，讲师，博士，研究方向为轨道结构与轨道力学，E-mail：jlallk@163.com

通讯作者:
肖杰灵（1978—），男，副教授，博士，研究方向为高速、重载轨道结构及轨道动力学，E-mail：xjling@swjtu.cn

中图分类号: U213.212
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- 被引次数: 0
出版历程
- 收稿日期: 2021-12-01
- 修回日期: 2022-02-24
- 网络出版日期: 2023-12-07
- 刊出日期: 2022-04-14

Analysis of Internal forces and Damage of Broad-Narrow Joint of CRTSⅡ Slab Track Under Temperature Rise

LIU Xiaokai^{1, 2, 3
,},
LIU Xueyi^{1, 2},
XIAO Jieling^{1, 2
, ,},
DONG Jiajia^{1, 2}

1.
MOE Key Laboratory of High-Speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, China
2.
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
3.
School of Science, North University of China, Taiyuan 030051, China

摘要

摘要:
为研究宽窄接缝在温升作用下的受力和损伤，根据混凝土塑性损伤理论和内聚力理论，建立考虑新旧混凝土界面的宽窄接缝细部的有限元模型；计算不同温升条件下的宽窄接缝应力和损伤因子，并分析宽窄接缝强度和窄接缝宽度的影响. 研究结果表明：窄接缝挤碎是一种渐变受压损伤，宽、窄接缝交界处断裂是一种脆性受拉损伤；与宽、窄接缝交界处断裂相比，窄接缝挤碎对结构受力影响更大；宽窄接缝尺寸不均匀导致宽、窄接缝交界处垂向受拉，这是宽窄接缝产生损伤的主要原因；提高宽窄接缝的混凝土强度可有效降低垂向拉应力和受拉损伤，但对纵向应力和受压损伤影响较小；为改善受力并降低损伤，建议宽窄接缝混凝土与轨道板等强，并且宽窄接缝上下等宽.
- 无砟轨道 /
- CRTSⅡ型板式轨道 /
- 宽窄接缝
Abstract:
In order to study the internal forces and the damage of broad-narrow joint under a temperature rise, a detailed finite element model with the interface between old and new concrete is established on the basis of concrete damaged plasticity model and cohesive zone model. The damage parameters and stress under different temperature rises are calculated, and the effects of the concrete strength at broad-narrow joint and the narrow joint width are analyzed. The results show that the fracture at the junction between broad and narrow joints is a brittle tension failure, and the breakage of narrow joint is a gradual compression failure. Compared with the fracture at the junction between broad and narrow joints, the breakage of narrow joint has a greater impact on the structural stress. The vertical tension stress arising from the uneven geometry at the junction between broad and narrow joints is the main cause for the damaged broad-narrow joint. Increasing the broad-narrow joint strength reduces the longitudinal compression stress and the compression damage, but contribute less to the vertical tension stress and the tension damage. To reduce damage and improve strength, it is recommended to equate the widths for the broad and narrow joints and the strengths for the concrete at the broad-narrow joint and the slab.
- ballastless track /
- CRTS Ⅱ slab track /
- broad-narrow joint

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图 1 平面应力状态下的屈服面

Figure 1. Yield surface in plane-stress state

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图 2 内聚力单元应力-位移关系

Figure 2. Stress-displacement relationship of cohesive element

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图 3 轨道结构有限元模型

Figure 3. Finite element model of track structure

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图 4 宽窄接缝细部有限元模型

Figure 4. Detailed finite element model of broad-narrow joint

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图 5 试验试件界面参数

Figure 5. Interface parameters of specimens in experiments

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图 6 界面的应力-位移曲线

Figure 6. Interfacial stress-displacement curves

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图 7 宽窄接缝的损伤云图

Figure 7. Damage contours of broad-narrow joint

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图 8 宽窄接缝的力学状态

Figure 8. Mechanical state of broad-narrow joint

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图 9 实际条件下损伤因子的变化

Figure 9. Variation of damage parameter in actual situations

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图 10 实际条件下应力的变化

Figure 10. Variation of normal stress in actual situations

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图 11 不同强度下宽窄接缝的损伤因子

Figure 11. Damage parameters of broad-narrow joint under different strengths

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图 12 不同强度下宽窄接缝的应力

Figure 12. Normal stress of broad-narrow joint under different strengths

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图 13 不同窄接缝宽度下宽窄接缝的损伤因子

Figure 13. Damage factors of broad-narrow joint under different widths of narrow joints

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图 14 不同窄接缝宽度下宽窄接缝的应力

Figure 14. Normal stress of broad-narrow joint under different widths of narrow joints

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表 1 界面参数

Table 1. Interface parameters

编号	拉伸刚度/ （GPa·m⁻¹）	拉伸强度/MPa	拉伸断裂能/ （N·m⁻¹）	剪切刚度/ （GPa·m⁻¹）	剪切强度/MPa	剪切断裂能/ （N·m⁻¹）
C55−砂浆	2.50	0.522	50.5	1.22	0.587	123.5
C55−C35	3.27	0.704	73.7	1.92	0.952	146.3
C55−C45	3.67	0.950	95.6	2.52	1.470	241.1
C55−C55	4.16	1.548	267.5	2.89	1.960	424.7

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表 2 主要计算参数

Table 2. Main calculation parameters

部件	弹性模量/GPa	泊松比	热膨胀系数/℃	密度/（kg·m⁻³）	宽度/m	厚度/m
轨道板	36.0	0.20	1.0 × 10⁻⁵	2500	2.55	0.20
CA 砂浆	10.0	0.20	1.0 × 10⁻⁵	2000	2.55	0.03
宽窄接缝	31.5	0.20	1.0 × 10⁻⁵	2500

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