CFRP布加固的地铁地下车站结构中柱抗震性能研究

姚凡夫; 杨帆; 庄海洋

doi:10.11899/zzfy20240412

CFRP布加固的地铁地下车站结构中柱抗震性能研究

doi: 10.11899/zzfy20240412

姚凡夫^1,,
杨帆¹,
庄海洋^{1, 2, ,}

1.
南京工业大学, 岩土工程研究所, 南京210009
2.
华东交通大学, 土木建筑学院, 南昌 330013

基金项目: 国家自然科学基金面上项目（52378397、51978333）

详细信息

作者简介:
姚凡夫，男，生于1999年。硕士研究生。主要从事地下结构抗震减灾研究。E-mail：862782543@qq.com

通讯作者:
庄海洋，男，生于1978年。教授。主要从事地下结构抗震与韧性提升研究。E-mail：3377@ecjtu.edu.cn

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出版历程
- 收稿日期: 2023-09-11
- 刊出日期: 2024-12-31

Seismic Performance of Middle Columns in Subway Station Structures Strengthened with CFRP Sheets

Yao Fanfu^1
,,
Yang Fan¹,
Zhuang Haiyang^{1, 2
, ,}

1.
Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210009, China
2.
School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China

摘要

摘要: 现浇地铁地下车站结构中柱柱端往往是抗震薄弱区域，采用在中柱顶底端对称包裹CFRP布的加固方法，并基于ABAQUS软件，建立了土-地下结构非线性静动力耦合相互作用的三维有限元分析模型，通过设置不同CFRP布包裹范围及层数的数值模型，研究其对加固效果的影响。研究结果表明，CFRP布可在不改变中柱侧向刚度的情况下增强中柱抗侧向变形能力，同时CFRP布能够减轻中柱顶底端核心混凝土剪切破坏，使震后中柱仍具有一定的承载力，提升了中柱延性。相同地震动输入条件下，CFRP布加固柱核心区混凝土损伤、残余侧向变形及塑性变形较未加固柱有明显改善，抗震性能有明显提高。CFRP布加固效果不会随着包裹范围和层数的增加始终保持线性增长，存在最优值使地下车站结构中柱抗震性能达到最佳，因此建议中柱顶底端CFRP布总包裹范围为中柱高度的1/2，包裹层数为5层。
- 碳纤维增强复合材料 /
- 地铁 /
- 车站 /
- 中柱加固 /
- 抗震性能 /
- 数值模拟
Abstract: In cast-in-place subway station structures, the ends of middle columns are often the most seismically vulnerable areas. This paper proposes a reinforcement method involving symmetrically wrapping CFRP sheets around the ends of middle columns. A three-dimensional finite element model was developed to simulate the nonlinear static and dynamic coupling interactions between the soil and underground structure using ABAQUS software. The influence of wrapping range (b) and the number of wrapping layers (n) on the reinforcement effectiveness was investigated by setting up numerical models with varying wrapping ranges and layer numbers. The objective was to analyze how CFRP wrapping affects the seismic response characteristics of middle columns in subway stations. The results show that CFRP wrapping enhances the lateral deformation resistance of middle columns without altering their lateral stiffness. Additionally, CFRP sheets reduce shear damage in the core concrete at the column ends, maintaining the column's bearing capacity post-earthquake and improving its ductility. Under identical ground motion conditions, CFRP-reinforced columns exhibit significantly reduced concrete damage, residual lateral deformation, and plastic deformation in the core area compared to unreinforced columns, resulting in improved seismic performance. However, the strengthening effect of CFRP does not increase linearly with the wrapping range or the number of layers; there is an optimal combination for achieving the best seismic performance. Based on the findings, the optimal wrapping range is 1/2 of the column height, with five wrapping layers ( b = 1/2, n = 5 ).
- Carbon fiber reinforced composites /
- Subway /
- Stations /
- Reinforce /
- Seismic performance /
- Numerical simulation

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图 1 大开车站结构尺寸参数

Figure 1. Size parameters of the Kobe Dakai station structure

下载: 全尺寸图片幻灯片

图 2 土-地下结构动力相互作用体系有限元模型

Figure 2. Finite element model for soil-subway station dynamic interaction system

下载: 全尺寸图片幻灯片

图 3 中柱核心区混凝土损伤（PBA=0.3 g，Kobe波）

Figure 3. Concrete damage in the core area of the middle column under 0.3 g Kobe wave

下载: 全尺寸图片幻灯片

图 4 中柱变形时程曲线（PBA=0.3 g、Kobe波）

Figure 4. Time histories of deformation of the middle column under 0.3 g Kobe wave

下载: 全尺寸图片幻灯片

图 5 中柱等效塑性应变（PBA=0.3 g、Kobe波）

Figure 5. Equivalent plastic strain in the middle column under 0.3 g Kobe wave

下载: 全尺寸图片幻灯片

图 6 中柱变形时程曲线（PBA=0.3 g、Kobe波）

Figure 6. Time histories of deformation of the middle column under 0.3 g Kobe wave

下载: 全尺寸图片幻灯片

图 7 中柱等效塑性应变（PBA=0.3 g、Kobe波）

Figure 7. Equivalent plastic strain in the middle column under 0.3 g Kobe wave

下载: 全尺寸图片幻灯片

表 1 大开单层车站土层主要物理力学参数

Table 1. Material parameters for soil

土质	深度/m	密度/(kg·m⁻³ )	剪切波速/(m·s⁻¹)	泊松比	黏聚力/kPa	内摩擦角/(°)
人工填土	0～1.0	1 900	140	0.333	20	15
全新世砂土	1.0～5.1	1 900	140	0.488	1	40
全新世砂土	5.1～8.3	1 900	170	0.493	1	40
更新世黏土	8.3～11.4	1 900	190	0.494	30	20
更新世黏土	11.4～17.2	1 900	240	0.490	30	20
更新世砂土	17.2～39.2	2 000	330	0.497	1	40

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表 2 模拟工况设计

Table 2. Simulation of the working condition

组号	编号	配布情况
组号	编号	b	n
A组	A1	0	0
B组	B1	1/8	5
	B2	1/2	5
	B3	1	5
C组	C1	1	3
C组	C2	1	7

下载: 导出CSV

表 3 不同CFRP布包裹范围中柱残余侧向变形

Table 3. Residual deformation of columns in different CFRP cloth wrapping ranges

地震动	PBA/g	残余侧向变形/mm				残余侧向变形衰减百分比/%				等效塑性变形/%				等效塑性变形衰减百分比/%
地震动	PBA/g	n=0 b=0	n=5 b=1/8	n=5 b=1/2	n=5 b=1	n=0 b=0	n=5 b=1/8	n=5 b=1/2	n=5 b=1	n=0 b=0	n=5 b=1/8	n=5 b=1/2	n=5 b=1	n=0 b=0	n=5 b=1/8	n=5 b=1/2	n=5 b=1
Kobe波	0.1	2.57	2.33	1.43	1.49	0	9.3	44.3	42.0	0.19	0.17	0.12	0.13	0	10.5	36.8	31.6
	0.2	4.13	3.67	1.97	2.03	0	11.1	52.3	50.8	0.32	0.28	0.19	0.19	0	12.5	40.6	40.6
	0.3	6.71	5.89	2.83	3.13	0	12.2	57.8	53.4	0.54	0.47	0.31	0.32	0	12.9	42.6	40.7
卧龙波	0.1	1.03	0.92	0.47	0.48	0	10.7	54.4	53.4	0.08	0.07	0.06	0.05	0	12.5	25.0	37.5
	0.2	2.70	2.40	1.23	1.25	0	11.0	54.5	53.7	0.21	0.17	0.12	0.13	0	14.3	42.9	38.1
	0.3	4.06	3.54	1.83	1.85	0	12.8	54.9	54.4	0.31	0.26	0.17	0.18	0	15.0	45.2	41.9
什邡八角波	0.1	2.49	2.22	1.31	1.39	0	10.8	47.4	44.2	0.18	0.16	0.11	0.12	0	11.1	38.9	33.3
	0.2	4.07	3.54	1.84	1.85	0	13.1	54.8	54.8	0.31	0.25	0.16	0.18	0	19.4	48.4	41.9
	0.3	6.11	5.01	2.52	2.60	0	18.0	58.8	57.4	0.49	0.39	0.25	0.27	0	20.4	50.0	44.9

下载: 导出CSV

表 4 不同CFRP布包裹层数中柱的残余侧向变形

Table 4. Residual deformation of columns in different CFRP cloth wrapping layers

地震动	PBA/g	残余侧向变形/mm				残余侧向变形衰减百分比/%				等效塑性变形/%				等效塑性变形衰减百分比/%
地震动	PBA/g	n=0 b=0	n=3 b=1	n=7 b=1	n=5 b=1	n=0 b=0	n=3 b=1	n=7 b=1	n=5 b=1	n=0 b=0	n=3 b=1	n=7 b=1	n=5 b=1	n=0 b=0	n=3 b=1	n=7 b=1	n=5 b=1
Kobe波	0.1	2.57	2.22	1.48	1.49	0	13.6	42.4	42.0	0.19	0.17	0.12	0.13	0	10.5	36.8	31.6
	0.2	4.13	3.56	2.03	2.03	0	13.8	50.8	50.8	0.32	0.27	0.19	0.19	0	15.6	40.6	40.6
	0.3	6.71	5.58	3.15	3.13	0	14.2	53.1	53.4	0.54	0.44	0.32	0.32	0	18.5	40.7	40.7
卧龙波	0.1	1.03	0.94	0.48	0.48	0	8.7	53.4	53.4	0.08	0.07	0.05	0.05	0	12.5	37.5	37.5
	0.2	2.70	2.39	1.65	1.25	0	11.5	38.9	53.7	0.21	0.18	0.12	0.13	0	14.3	42.9	38.1
	0.3	4.06	3.45	1.82	1.85	0	15.0	55.2	54.4	0.31	0.26	0.16	0.18	0	15.0	48.4	41.9
什邡八角波	0.1	2.49	2.14	1.37	1.39	0	14.1	45.0	44.2	0.18	0.17	0.11	0.12	0	5.6	38.9	33.3
	0.2	4.07	3.45	1.85	1.85	0	15.2	54.5	54.8	0.31	0.27	0.18	0.18	0	14.8	41.9	41.9
	0.3	6.11	5.17	2.59	2.60	0	15.4	57.6	57.4	0.49	0.38	0.27	0.27	0	22.4	44.9	44.9

下载: 导出CSV

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