考虑温度效应下冻土层对桥梁结构地震响应的影响

殷鹏程; 孙义贤; 庞于涛; 王晓伟; 朱维元

doi:10.19509/j.cnki.dzkq.tb20220505

考虑温度效应下冻土层对桥梁结构地震响应的影响

doi: 10.19509/j.cnki.dzkq.tb20220505

1.
中铁第四勘察设计院集团有限公司, 武汉 430063
2.
中国地质大学(武汉)工程学院, 武汉 430074
3.
同济大学土木工程防灾国家重点实验室, 上海 200092

基金项目:

国家自然科学基金项目 51708527

详细信息

作者简介:
殷鹏程(1983-), 男, 高级工程师, 主要从事桥梁工程方面工作。E-mail: pcyin0609@163.com

通讯作者:
庞于涛(1988-), 男, 副教授, 主要从事桥梁抗震方面工作。E-mail: pangyutao@cug.edu.cn

中图分类号: U445.7⁺5
计量
- 文章访问数: 530
- PDF下载量: 110
- 被引次数: 0
出版历程
- 收稿日期: 2022-09-06
- 录用日期: 2023-02-13
- 修回日期: 2023-02-06

Influence of frozen soil on the seismic responses of bridge structures considering the effect of temperature

1.
China Railway Siyuan Survvey and Design Group Co., Ltd., Wuhan 430063, China
2.
Faculty of Engineering, China University of Geosciences(Wuhan), Wuhan 430074, China
3.
State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China

摘要

摘要:
近年来冻土区实际桥梁结构的震害已经表明, 冻土的存在会增加桥梁基础的土体侧向刚度, 可能会使桥梁结构出现更为严重的地震损伤, 然而目前缺乏关于地震作用下冻土桥梁结构的冻土-桩相互作用效应以及相应地震响应规律的研究。基于所提出的高效非线性数值模型来考虑地震作用下的冻土-桩基础相互作用效应, 推导了冻土深度与地表温度的关系, 给出了冻土层的p-y弹簧非线性数值模拟方法, 并选择了多条地震实测记录, 研究了地震作用下不同冻土深度对规则桥梁墩柱以及支座地震响应的影响规律。结果表明, 本研究所采用的高效非线性数值模型较好地模拟了冻土下桥梁结构的抗震性能, 且所建立的冻土p-y弹簧曲线具有很好的准确性。当峰值加速度(PGA)较小时, 冻土对于桥墩墩底曲率的增幅达20%, 而当PGA较大时, 冻土可增加桥墩曲率响应(达185%), 使桥墩更易进入屈服。当冻土深度较小(温度等于-5℃)时, 支座位移有较大的增加, 增加了地震作用下主梁的落梁风险, 且冻土可使地震作用下结构体系的最不利部位发生转移。研究结果可为我国冻土桥梁结构的抗震性能与相应的抗震设计方法研究提供必要的理论基础与数据支持, 这一基础性工作对于推动我国冻土区桥梁工程防灾减灾的发展与工程应用具有重要意义。
- 季节性冻土 /
- 桥梁结构 /
- 数值模拟 /
- 地震响应 /
- 温度效应
Abstract: Objective
Recently, the seismic damage of an actual bridge structure in a frozen soil area has shown that the presence of frozen soil will increase the lateral stiffness of the bridge foundation, which may cause more serious seismic damage to the bridge structure, but there is a lack of research on the frozen soil-pile interaction effect of frozen soil bridge structures under seismic loadings and the corresponding seismic responses.
Methods
The present paper proposed efficient nonlinear numerical models to consider the effect of the frozen soil-pile interaction on the seismic responses of structures. First, the relationship between the depth of frozen soil and surface temperature was constructed. Then, the p-y spring modelling approach was presented to simulate the seismic behavior of frozen soil. Several as-recorded ground motions were selected as the seismic input. The seismic responses of piers and bearings of regular bridges with different depths of frozen soil under seismic loadings were investigated.
Results
The results show that the proposed efficient nonlinear numerical model can be adopted to model the seismic behavior of bridges considering frozen soil. And the proposed p-y curves for frozen soil can accurately predict the p-y relationship from the existing tests. When the PGA is relatively small, the pier curvature increases slightly; by contrast, in the case of large PGA, frozen soil can significantly increase the curvature demands, which can make the pier enter into the inelastic behavior. When the depth of frozen soil is small (the temperature is -5℃), the bearing displacement increases significantly, which increases the probability of unseating under seismic loadings. Moreover, frozen soil can transfer to the adverse locations of structural systems under seismic loadings.
Conclusion
Therefore, the conclusions of this paper can provide the necessary theoretical basis and data support for studying the seismic performance and corresponding seismic design methods of frozen soil bridge structures in China, which is of great significance for promoting the development and engineering application of disaster prevention and mitigation of bridge engineering in frozen soil areas in China.
- seasonal frozen soil /
- bridge structure /
- numerical simulation /
- seismic responses /
- temperature effect
注释:

(所有作者声明不存在利益冲突)

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图 1 桥梁结构的示意图以及相应尺寸(D.桥墩圆形截面直径；φ_B.桩基砂粒体积分数)

Figure 1. Schematic of the considered bridge structure and the corresponding dimensions

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图 2 基于p-y弹簧的桥梁桩柱式基础高效有限元模型

Figure 2. Efficient finite element model of the pile shaft foundation based on the p-y springs

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图 3 纤维单元中钢筋和混凝土力学本构模型

Figure 3. Stress-strain relationship of steel and concrete in fiber elements

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图 4 所选取地震波的反应谱：加速度谱(a)和位移谱(b)

Figure 4. Response spectra of selected ground motions: acceleration spectra (a) and displacement spectra (b)

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图 5 本研究所采用的冻土的p-y曲线

Figure 5. Sketch of the proposed p-y curve for frozen soil

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图 6 本研究建立的冻土p-y曲线与现有文献[18]数据的对比

Figure 6. Comparison between the p-y curves for frozen soil in the literature [18] and the realizations in OpenSees in this paper

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图 7 不同冻土深度对桥梁自振周期的影响

Figure 7. Effect of frozen soil depth on the vibration period of bridges

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图 8 E3地震波下冻土深度为0，0.5, 2.0 m时的桥墩墩顶位移(a)、墩底剪力(b)以及墩底弯矩(c)

Figure 8. Top displacement (a), bottom shear (b) and moment responses (c) of piers under E3 seismic wave when the depth of the frozen soil is selected as 0, 0.5, 2.0 m

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图 9 不同地震动强度与温度作用下冻土对桥墩与支座地震响应的影响：曲率延性系数(a)和支座位移(b)

Figure 9. Effect of frozen soil on the seismic responses of columns and bearings at different IM levels and temperatures: curvature ductility factor (a) and bearing displacement (b)

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图 10 不同上部结构质量下不同冻土深度对墩底曲率延性系数(a)与支座位移响应(b)的影响

Figure 10. Effect of frozen soil on pier curvature (a) and bearing displacement (b) under different superstructure masses and different depths

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图 11 E1地震波下墩身与桩身不同部位的曲率响应图

Figure 11. Curvature responses at different locations of both the pier and pile under the E1 seismic wave

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表 1 选取的7条地震动时程信息

Table 1. Information on the seven selected ground motion records

序号	地震名称	年份	震级	测站	PGA/g	PGV/(cm·s^-1)
E1	Imperial valley-06	1979	6.5	Brawley Airport	0.22	72.98
E2	Imperial valley-06	1979	6.5	EC County Center FF	0.20	53.17
E3	Supersition hill	1987	6.6	El Centro Imp.Co.Cent	0.33	32.85
E4	Supersition hill	1987	6.6	Parachute Test Site	0.27	44.58
E5	LomaPrieta	1989	7.0	Gilroy-Gavilan Coll.	0.46	37.97
E6	LomaPrieta	1989	7.0	Gilroy Array #1	0.37	46.37
E7	Landers	1992	7.3	Gilroy Array #3	0.32	58.33

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表 2 不同地区的季节性冻土深度H_f与地表温度T_s的关系

Table 2. Relationship between seasonal frozen soil depth H_f and surface temperature T_s

资料来源	地表温度T_s/℃	冻土深度H_f/m	T_s/H_f
文献[10]	-8.0	2.38	-3.36
文献[11]	-15.8	1.45	-10.90
文献[1]	-7.0	0.46	-15.21
文献[1]	-10.0	0.76	-13.16
均值			-10.66

下载: 导出CSV

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