沉管隧道接头剪力键抗震性能及减震措施

程新俊; 景立平; 崔杰; 梁海安; 徐琨鹏

doi:10.3969/j.issn.0258-2724.20200548

沉管隧道接头剪力键抗震性能及减震措施

doi: 10.3969/j.issn.0258-2724.20200548

程新俊^{1, 2,},
景立平²,
崔杰³,
梁海安¹,
徐琨鹏²

1.
东华理工大学土木与建筑工程学院，江西南昌 330013
2.
中国地震局工程力学研究所，黑龙江哈尔滨 150080
3.
广州大学土木工程学院，广东广州 510006

基金项目: 国家重点研发计划（2016YFC0800205）；国家自然科学基金（52008081）

详细信息

作者简介:
程新俊（1988—），男，讲师，博士，研究方向为地下结构抗震，E-mail：chengxinjuniem@163.com

中图分类号: TU921
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- 文章访问数: 389
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- 被引次数: 0
出版历程
- 收稿日期: 2020-08-16
- 修回日期: 2021-02-28
- 网络出版日期: 2022-08-03
- 刊出日期: 2021-03-08

Seismic Performance and Damping Measures of Shear Keys for Immersed Tunnel Joints

1.
School of Civil and Architectural Engineering, East China University of Technology, Nanchang 330013, China
2.
Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China
3.
School of Civil Engineering, Guangzhou University, Guangzhou 510006, China

摘要

摘要:
为提高沉管隧道接头的抗震安全性，设计了一种减震装置，完成了有无减震装置2组1/4大比例尺的接头剪力键模型往复加载拟静力对比试验. 通过试验揭示了沉管隧道接头剪力键模型在水平循环荷载下的力学行为及抗震性能，并验证了新型减震装置在沉管隧道接头减震中的可行性. 试验结果表明：无减震模型在循环剪切荷载下，凹槽端部率先出现裂缝，随后剪力键端部开始出现裂缝，随着加载位移的增大，剪力键出现较大塑性变形后失效；减震模型在循环剪切荷载下减震装置先出现局部屈曲，随后剪力键出现剪切破坏，减震装置可延迟剪力键的开裂时间；与无减震模型相比，减震模型在输入相同的加载位移时，其开裂荷载、屈服荷载、峰值荷载及破坏荷载分别提高了45.2%、37.33%、26.8%和29.2%；减震装置对模型初始刚度影响相对较小，且能满足规范限定的接头容许位移；单圈滞回耗能最大可提高55.1%，累积滞回耗能提高了31.9%，该减震装置可较好地提高剪力键的整体抗震性能.
- 地下结构抗震 /
- 抗震性能 /
- 地震破坏 /
- 沉管隧道 /
- 减震
Abstract:
In order to improve the seismic safety of immersion joints, a new type of damping device for immersed tube tunnel joints was designed, and two groups of quasi-static tests were performed using a 1/4 scale shear key model with and without the damping device for comparative analysis. Through the tests, the mechanical behavior and seismic performance of the immersion joints under horizontal cyclic loading were revealed, and the feasibility of applying the new damping device in the vibration reduction of the immersed tunnel joint was verified. The results show that under the cyclic shear load, cracks first appear at the groove end of the traditional joint model, and then appear at the end of the shear key. As the loading displacement increases, the shear key experiences a large plastic deformation and then fails. Under the cyclic shear load, the damping device first suffers a local buckling, and the shear key is then subject to a shear failure. The damping device can delay the cracking time of the shear key. Compared with the traditional model without damping equipment, the cracking load, yield load, peak load and failure load of the damping model are increased by about 45.2%, 37.33%, 26.8% and 29.2%, respectively, under the same loading displacement. Meanwhile, the influence of the damping device on the initial stiffness of the model is relatively small, and it can meet the allowable displacement of the joint specified by the relevant code. The single-loop hysteretic energy consumption and the cumulative hysteretic energy consumption can be increased by 55.1% and 31.9%, respectively. Overall, the damping device can effectively improve the seismic performance of the shear key.
- seismic performance of underground structures /
- seismic behavior /
- earthquake damage /
- immersed tunnel /
- seismic mitigation

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图 1 沉管隧道纵断面

Figure 1. Longitudinal profile of the immersed tunnel

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图 2 接头构造示意

Figure 2. Schematic of the immersion joint structure

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图 3 管节接头剪力键

Figure 3. Shear keys in immersion joint

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图 4 试验模型立面

Figure 4. Experimental model elevation

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图 5 减震装置

Figure 5. Damping device

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图 6 减震装置设计

Figure 6. Connection design of the damping device

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图 7 加载体系

Figure 7. Loading system

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图 8 传感器布置

Figure 8. Sensor arrangement

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图 9 应变片布置

Figure 9. Strain gauge arrangement

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图 10 试验加载工况

Figure 10. Loading cases during the tests

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图 11 试件P1裂缝发展情况

Figure 11. Cracking development of specimen P1

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图 12 试件P2裂缝发展情况

Figure 12. Cracking development of specimen P2

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图 13 试件钢筋应力

Figure 13. Steel stress distribution of specimens

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图 14 滞回曲线

Figure 14. Hysteretic loop

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图 15 骨架曲线

Figure 15. Skeleton curves

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图 16 各阶段模型承载力

Figure 16. Bearing capacity at different stages

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图 17 试件刚度衰减曲线

Figure 17. Stiffness attenuation curves

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图 18 耗能曲线

Figure 18. Energy dissipation curves

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表 1 橡胶垫材料参数

Table 1. Mechanical parameters of rubber pads

名称数值

邵氏硬度/HA 55
断裂强度/ MPa 16
延性/% > 450
抗压强度/MPa 10
剪切模量/MPa 1.06 ~ 1.11
摩擦系数钢 0.2，混凝土 0.3

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表 2 Q235板材力学参数

Table 2. Mechanical parameters of steel plate

参数厚度/
mm 屈服强
度/MPa 抗拉强
度/MPa 屈强比断裂
延伸率/%

取值 10 310 428 0.73 35.6

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