基于流固耦合分析的高墩渡槽止水地震失效分析

邓开来; 张烨欣; 李智渊; 郝明辉; 廖文彬

doi:10.3969/j.issn.0258-2724.20230640

基于流固耦合分析的高墩渡槽止水地震失效分析

doi: 10.3969/j.issn.0258-2724.20230640

1.
西南交通大学土木工程学院，四川成都，610031
2.
四川水发勘测设计研究有限公司，成都，610072
3.
四川省交通运输厅公路局，成都，610041

基金项目: 云南省重大科技专项计划（202102AF080001）；四川省科技计划（2022JDRC0012，2023YFS0429）

详细信息

作者简介:
邓开来（1989—），男，副教授，博士，研究方向为工程抗震，E-mail：kailai_deng@163.com

通讯作者:
廖文彬（1974—），男，研究方向为公路工程，E-mail：aa77552023@163.com

中图分类号: U442.55
计量
- 文章访问数: 34
- HTML全文浏览量: 23
- PDF下载量: 4
- 被引次数: 0
出版历程
- 收稿日期: 2023-12-05
- 修回日期: 2024-01-12
- 网络出版日期: 2024-07-25

Seismic Failure Analysis of High-Pier Aqueduct Water-Stop Based on Fluid-Solid Coupling

1.
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
2.
Sichuan Water Development Investigation, Design & Research Co., Ltd., Chengdu 610072, China
3.
Highway Bureau of Department of Transportation of Sichuan Province, Chengdu 610041, China

摘要

摘要:
为探究地震下大型高墩渡槽止水的性能表现，基于流固耦合方法建立渡槽结构有限元模型，模拟动力效应下渡槽-水体的非线性耦合行为，通过引入止水变形失效阈值，重现槽跨间止水的失效过程，模拟止水失效后槽内水体的外溢；依托某实际高墩渡槽结构，通过非线性动力分析得到渡槽的宏细观地震响应，包括槽墩应变、支座位移、止水损伤等，揭示不同支座类型、减隔震装置对渡槽抗震性能的影响. 研究结果表明：在罕遇地震下，槽墩、槽身不会发生显著材料损伤，地震下渡槽结构安全具有保障；但设计地震下，渡槽止水即发生失效，无法保障渡槽震后保持正常引水功能；加入钢阻尼器可有效控制槽跨的变形，保障设计地震下渡槽止水不发生破坏，但罕遇地震下止水不可避免发生破坏，强震下的槽跨变形控制依然面临着挑战.
- 高墩渡槽 /
- 流固耦合 /
- 动力分析 /
- 减隔震支座 /
- 止水失效
Abstract:
To explore the water-stop performance of a large-scale high-pier aqueduct under earthquakes, a finite element model of the aqueduct was established based on the fluid-solid coupling method, and the nonlinear coupling behavior of the aqueduct and water under dynamic effects was simulated. By introducing the deformation and failure threshold of the water-stop, the failure process between the aqueduct spans was reproduced, and the overflow of the water body in the aqueduct after the water-stop failure was revealed. Based on an actual high-pier aqueduct structure, the macro- and micro-seismic response of the aqueduct was obtained through nonlinear dynamic analysis, including pier strain, bearing displacement, and water-stop damage. The impact of different bearing types and seismic isolation devices on the seismic performance of aqueducts was revealed. The research results show that under rare earthquakes, severe structural damage will not occur to the piers and the aqueduct, and the structural safety of the aqueduct under earthquakes is guaranteed. However, under designed earthquakes, the water-stop of the aqueduct will fail, which cannot guarantee that the aqueduct will maintain the water diversion function after an earthquake. Adding steel dampers can effectively control the deformation of the aqueduct spans, ensuring that the water-stop of the aqueduct will not be damaged under a designed earthquake. However, the water-stop will inevitably be damaged under rare earthquakes, and the deformation control of the aqueduct spans under strong earthquakes still faces challenges.
- high-pier aqueduct /
- fluid-solid coupling /
- dynamic analysis /
- seismic isolation bearing /
- water-stop failure

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图 1 某典型渡槽（单位：cm）

Figure 1. Typical aqueduct （unit: cm）

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图 2 槽缝处止水构造

Figure 2. Structure of water-stop between aqueducts

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图 3 渡槽节段数值模型

Figure 3. Numerical model of segmental aqueduct

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图 4 材料本构模型

Figure 4. Constitutive model of material

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图 5 槽跨相对位移

Figure 5. Relative displacement of aqueduct span

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图 6 止水破坏和水体流失过程

Figure 6. Water-stop damage and water loss process

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图 7 止水损伤因子和EVF随时间变化规律

Figure 7. Variation of water-stop damage factor and EVF with time

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图 8 典型渡槽全桥模型

Figure 8. Full bridge model of typical aqueduct

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图 9 支座和挡块的力学模型

Figure 9. Mechanical model of bearing and block

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图 10 渡槽自振模态

Figure 10. Vibration mode of aqueduct

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图 11 地震安评报告提供的反应谱

Figure 11. Response spectrum by earthquake safety assessment report

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图 12 墩顶最大水平力

Figure 12. Maximum horizontal force at pier top

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图 13 支座最大变形

Figure 13. Maximum deformation of bearing

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图 14 DBE强度下止水失效模式

Figure 14. Failure mode of water-stop at DBE intensity

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图 15 止水失效时刻

Figure 15. Failure time of water-stop

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图 16 VRE强度下渡槽水体残余高度

Figure 16. Residual water height in aqueducts at VRE intensity

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图 17 残余水体体积比例

Figure 17. Ratio of residual water volume

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表 1 渡槽动力响应分析工况设施

Table 1. Working conditions for aqueduct dynamic response

工况名称支座挡块阻尼器

PRB 盆式橡胶支座无无
FPS-R 摩擦摆支座有无
FPS-D 摩擦摆支座无有

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表 2 槽墩混凝土最大应力

Table 2. Maximum stress of concrete in pier MPa

工况 PRB FPS-R FPS-D

DBE 1.31 0.31 0.95

MCE 2.14 0.91 1.58

VRE 2.66* 2.41 2.66*

　*注：主应力超过开裂应力，无法继续增加.

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