盾构隧道斜螺栓接头受力性能与火灾下温度分布规律

张稳军; 张新新; 宋晓龙

doi:10.19818/j.cnki.1671-1637.2018.06.005

盾构隧道斜螺栓接头受力性能与火灾下温度分布规律

doi: 10.19818/j.cnki.1671-1637.2018.06.005

张稳军^{1, 2,},
张新新^{1, 2},
宋晓龙^{1, 2}

1.
天津大学建筑工程学院, 天津 300354
2.
天津大学滨海土木工程结构与安全教育部重点实验室, 天津 300354

基金项目:

国家自然科学基金项目 51778412

详细信息

作者简介:
张稳军(1975-), 男, 甘肃平凉人, 天津大学副教授, 工学博士, 从事隧道与地下工程施工及设计新理论研究

中图分类号: U455.43
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出版历程
- 收稿日期: 2018-06-09
- 刊出日期: 2018-12-25

Mechanical properties of shield tunnel with inclined bolt joint and temperature distribution law under fire

ZHANG Wen-jun^{1, 2
,},
ZHANG Xin-xin^{1, 2},
SONG Xiao-long^{1, 2}

1.
School of Civil Engineering, Tianjin University, Tianjin 300354, China
2.
Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University, Tianjin 300354, China

More Information

Author Bio:
ZHANG Wen-jun(1975-), male, associate professor, PhD, wjzhang@tju.edu.cn

摘要

摘要: 利用有限元计算软件ABAQUS建立了环向复合管片与环向斜螺栓接头的三维实体模型; 考虑复合管片材料的非线性, 采用弹塑性本构模型, 分析了环向斜螺栓接头在常温下的力学特性; 根据HC升温曲线, 分析了接头模型的传热特性, 研究了复合管片衬砌和环向斜螺栓接头在火灾下的温度分布规律。分析结果表明: 采用高强螺栓能够有效减小接头张开量, 增大接头刚度; 在采用高强螺栓的情况下, 斜螺栓最大轴应力易在初始阶段达到屈服, 屈服后接头弯矩和轴力的增大对斜螺栓的应力影响并不大, 但对斜螺栓变形影响较大, 当接头负弯矩从7 kN·m增加到122 kN·m, 接头轴力从368kN增加到734 kN时, 斜螺栓最大应变增加1.6倍, 当接头正弯矩从53 kN·m增加到182 kN·m, 接头轴力从903kN增加到1 056 kN时, 斜螺栓最大应变增加5.9倍; 常温下接缝附近斜螺栓的轴应力呈现反对称分布, 除接缝外其他部位斜螺栓的轴应力基本相等, 约为400MPa, 接缝处轴应力绝对值最大值可达700 MPa; 火灾情况下手孔处温度上升最快且达到的温度最高, 80 min时即可达到1 000 ℃, 接缝处混凝土在100min后达到稳定温度, 螺母处混凝土在150 min后达到稳定温度, 稳定温度均为1 000 ℃左右。
- 隧道工程 /
- 复合管片 /
- 斜螺栓接头 /
- 力学性能 /
- 火灾 /
- 温度分布
Abstract: A three-dimensional solid model of circumferential composite segments and the circumferential inclined bolted joint was established using the finite element calculation software ABAQUS.The nonlinearity of the composite segment material was considered, and the elastoplastic constitutive model was adopted.The mechanical properties of the circumferential inclined bolted joint under normal temperature were analyzed.According to the heating up curve of HC, the heat transfer characteristics of the joint model were analyzed, and the temperature distribution laws of the composite segment lining and the circumferential inclined bolted joint under fire were studied.Analysis result shows that the use of a high-strength bolt can effectively reduce the opening of the joint and increase the joint stiffness.For high-strength bolts, the maximum axial stress of the inclined bolt is easy to yield at the initial stage, and the increase inbending moment and axial force of the joint has little influence on the stress of the bolt, but has more influence on deformation of the bolt.When the negative bending moment of the joint increases from 7 kN·m to 122 kN·m, the axial force of the joint increases from 368 kN to 734 kN, and the maximum strain of the inclined bolt increases by 1.6 times.When the positive bending moment of the joint increases from 53 kN·m to 182 kN·m, and the axial force of the joint increases from 903 kN to 1 056 kN, the maximum strain of the inclined bolt increases by 5.9 times.Under the normal temperature, a special antisymmetric distribution of the axial stress of the inclined bolt is shown near the seam.The axial stresses of the inclined bolt, except the joints are equal, is about 400 MPa, and the maximum absolute value of the axial stress at the joint can reach 700 MPa.In a fire, the fastest temperature rise is at the hand hole, and if the temperature reaches its highest, it can reach 1 000 ℃ in 80 min.The temperature of concrete at the seam reaches a stable temperature after 100 min, and at the nut after 150 min.This stable temperature is about 1 000℃.
- tunnel engineering /
- composite segment /
- inclined bolt joint /
- mechanical property /
- fire /
- temperature distribution

HTML全文

图 1 管片与接头尺寸和构造(单位: mm)

Figure 1. Size and structure of segments and joints (unit: mm)

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图 2 模型装配

Figure 2. Model assembly

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图 3 复合管片钢板和混凝土构造

Figure 3. Steel plate and concrete structure of composite segment

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图 4 混凝土压应力-应变曲线

Figure 4. Compressive stress-strain curve of concrete

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图 5 螺栓应力-应变曲线

Figure 5. Stress-strain curve of bolt

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图 6 管片与螺栓网格划分

Figure 6. Mesh generation of segment and bolt

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图 7 斜螺栓上侧各节点轴应力

Figure 7. Axial stresses of joint on upside of inclined bolt

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图 8 负弯矩下接头弯矩和轴力

Figure 8. Bending moments and axial forces of joints under negative bending moment

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图 9 负弯矩下斜螺栓最大轴力和最大轴力截面平均应力

Figure 9. Maximum axial forces and average stresses of maximum axial force section of inclined bolt under negative bending moment

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图 10 负弯矩下斜螺栓最大应力和最大应变

Figure 10. Maximum stresses and maximum strains of inclined bolt under negative bending moment

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图 11 负弯矩下接头张开量和错台量

Figure 11. Joint openings and stagger quantities under negative bending moment

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图 12 正弯矩下接头弯矩和轴力

Figure 12. Bending moments and axial forces of joints under positive bending moment

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图 13 正弯矩下斜螺栓最大轴力和最大轴力截面平均应力

Figure 13. Maximum axial forces and average stresses of maximum axial force section of inclined bolt under positive bending moment

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图 14 正弯矩下斜螺栓最大应力和最大应变

Figure 14. Maximum stresses and maximum strains of inclined bolt under positive bending moment

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图 15 正弯矩下管片接头张开量和错台量

Figure 15. Joint openings and stagger quantities under positive bending moment

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图 16 斜螺栓轴应力分布

Figure 16. Axial stress distributions of inclined bolt

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图 17 斜螺栓轴应力沿轴线变化曲线

Figure 17. Axial stress change curves along axis of inclined bolt

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图 18 混凝土导热系数与温度关系

Figure 18. Relationship between thermal conductivity and temperature of concrete

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图 19 混凝土比热容与温度关系

Figure 19. Relationship between specific heat capacity and temperature of concrete

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图 20 钢的导热系数与温度关系

Figure 20. Relationship between thermal conductivity and temperature of steel

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图 21 钢的比热容与温度关系

Figure 21. Relationship between specific heat capacity and temperature of steel

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图 22 HC升温曲线

Figure 22. Heating up curve of HC

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图 23 对流换热系数曲线

Figure 23. Curve of convective heat transfer coefficient

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图 24 管片温度分布

Figure 24. Distribution of segment temperature

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图 25 接头温度分布

Figure 25. Distribution of joint temperature

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图 26 螺母、手孔和接缝温度曲线

Figure 26. Temperature curves of nut, hand hole and seam

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图 27 斜螺栓沿轴线各节点温度随受热时间变化曲线

Figure 27. Temperature variation curves of each node along axis of inclined bolt with heating time

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图 28 斜螺栓沿轴线各节点温度随距螺母端距离变化曲线

Figure 28. Temperature variation curves of each node along axis of inclined bolt with distance from nut

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表 1 管片模型几何参数

Table 1. Geometric parameters of segment model mm

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表 2 钢板和混凝土材料参数

Table 2. Material parameters of steel plate and concrete

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表 3 接头螺栓参数

Table 3. Parameters of joint bolt

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盾构隧道斜螺栓接头受力性能与火灾下温度分布规律

doi: 10.19818/j.cnki.1671-1637.2018.06.005

作者简介:
张稳军(1975-), 男, 甘肃平凉人, 天津大学副教授, 工学博士, 从事隧道与地下工程施工及设计新理论研究

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Mechanical properties of shield tunnel with inclined bolt joint and temperature distribution law under fire

Author Bio:
ZHANG Wen-jun(1975-), male, associate professor, PhD, wjzhang@tju.edu.cn

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盾构隧道斜螺栓接头受力性能与火灾下温度分布规律

doi: 10.19818/j.cnki.1671-1637.2018.06.005

作者简介: 张稳军(1975-), 男, 甘肃平凉人, 天津大学副教授, 工学博士, 从事隧道与地下工程施工及设计新理论研究

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Mechanical properties of shield tunnel with inclined bolt joint and temperature distribution law under fire

Author Bio: ZHANG Wen-jun(1975-), male, associate professor, PhD, wjzhang@tju.edu.cn

计量

出版历程

目录

作者简介:
张稳军(1975-), 男, 甘肃平凉人, 天津大学副教授, 工学博士, 从事隧道与地下工程施工及设计新理论研究

Author Bio:
ZHANG Wen-jun(1975-), male, associate professor, PhD, wjzhang@tju.edu.cn